fix(install): make install.ps1 work on Windows PowerShell 5.1

The in-box Windows shell (5.1, .NET Framework) is the baseline we must
support; PowerShell 7 is an opt-in install most users don't have.

- arch detection: read PROCESSOR_ARCHITECTURE/ARCHITEW6432 from the
  environment instead of RuntimeInformation::OSArchitecture, which
  resolves from a .NET Framework facade lacking that property under 5.1
  and throws under StrictMode (the reported failure).
- force TLS 1.2 before any web request (5.1 may default to TLS 1.0/1.1).
- pass -UseBasicParsing to Invoke-WebRequest (5.1 otherwise uses the IE
  engine and can fail when it is absent).

All three are no-ops on PowerShell 7. Relates to ADR-0055.

.cargo/config.toml

@@ -0,0 +1,17 @@
+# Windows cross-link fix for the D1 release matrix (cargo-zigbuild).
+#
+# Rust's std links `-lsynchronization` on Windows (WaitOnAddress-based thread
+# parking). Rust normally satisfies this from the `self-contained` mingw libs
+# of its `rust-mingw` component — which rust-overlay does NOT ship — and Zig's
+# bundled mingw (used by `cargo zigbuild`) doesn't provide `libsynchronization.a`
+# either. The actual symbols are *forwarded by kernel32* (already linked), so an
+# empty stub import lib is enough to satisfy the linker. See `ci/winstub/`.
+#
+# These sections apply ONLY when building for the Windows targets, so host
+# builds (the gate's `cargo test`/`clippy`) and the Linux release targets are
+# unaffected.
+[target.x86_64-pc-windows-gnu]
+rustflags = ["-L", "native=ci/winstub"]
+
+[target.aarch64-pc-windows-gnullvm]
+rustflags = ["-L", "native=ci/winstub"]

.envrc

@@ -0,0 +1 @@
+use flake

.git-blame-ignore-revs

@@ -0,0 +1,7 @@
+# Revisions to ignore in `git blame` — bulk, mechanical, no-behaviour-change
+# commits whose authorship is noise. Enable locally with:
+#   git config blame.ignoreRevsFile .git-blame-ignore-revs
+# (Forges that support it, e.g. GitHub, pick this up automatically.)
+
+# style: format the whole tree with cargo fmt (stock defaults, #35)
+41b7e9a04992cd9708f1775b57044de838b48b85

.gitea/ci-image/Dockerfile

@@ -0,0 +1,65 @@
+# CI toolchain image for rdbms-playground.
+#
+# Purpose: a SMALL job-container image that
+#   (a) satisfies the Gitea act_runner job-container contract — /bin/sleep (the
+#       keep-alive entrypoint), bash (run: steps), node (JS actions such as
+#       actions/checkout); a bare nixos/nix image has none of these and won't
+#       even start (verified by the ci-probe run: "/bin/sleep: no such file"); and
+#   (b) carries the project's pinned nix toolchain with the flake's devShell
+#       pre-warmed, so CI runs `nix develop -c cargo ...` against a warm store.
+#
+# Base: node:22-bookworm-slim. Debian slim already provides bash + coreutils
+# (sleep); the node tag adds the actions runtime. Far smaller than the
+# catthehacker runner images (which bundle a whole GitHub-runner emulation we
+# don't need).
+FROM node:22-bookworm-slim
+
+# nix install + flake eval needs these. git because flakes prefer a VCS context
+# and tools shell out to it. Drop apt lists to keep the layer small.
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      curl xz-utils ca-certificates git \
+ && rm -rf /var/lib/apt/lists/*
+
+# Single-user nix (--no-daemon): store at /nix owned by root, no daemon/systemd
+# needed — the correct mode for a container. The official installer refuses root
+# and shells out to `sudo` purely to create /nix; pre-creating it ourselves (we
+# ARE root) sidesteps both. Enable flakes globally so every nix invocation (and
+# the runner's steps) get nix-command + flakes without flags.
+# nix.conf is written FIRST so the installer's own `nix-env` profile step reads
+# it: `build-users-group =` (empty) makes single-user nix build as the calling
+# user (root) instead of demanding the nixbld group/users a daemon install would
+# create; flakes are enabled globally in the same file.
+RUN mkdir -m 0755 /nix && chown root:root /nix \
+ && mkdir -p /etc/nix \
+ && printf 'build-users-group =\nexperimental-features = nix-command flakes\n' > /etc/nix/nix.conf \
+ && curl --proto '=https' --tlsv1.2 -sSf -L https://nixos.org/nix/install -o /tmp/nix-install.sh \
+ && sh /tmp/nix-install.sh --no-daemon \
+ && rm /tmp/nix-install.sh
+ENV PATH=/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:$PATH
+# We set PATH directly instead of sourcing the profile, so also point nix at the
+# Debian CA bundle (already installed) for substituter HTTPS — otherwise the
+# profile-provided NIX_SSL_CERT_FILE is missing and store downloads fail.
+ENV NIX_SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
+
+# Warm the flake's devShell into the store: realizes nixpkgs + the pinned Rust
+# toolchain (rustc/cargo/clippy/rustfmt) + cargo-sweep. Only the inputs that
+# determine the shell are copied, so this expensive layer is cached and only
+# re-runs when the flake or the toolchain pin changes — not on every source edit.
+# (devShell eval is lazy: packages.default — and thus Cargo.toml/Cargo.lock — is
+# never forced here, so it needn't be present.)
+WORKDIR /warm
+COPY flake.nix flake.lock rust-toolchain.toml ./
+RUN nix develop -c rustc --version \
+ && nix develop -c cargo --version \
+ && nix develop -c cargo clippy --version \
+ && nix develop -c cargo fmt --version \
+ && nix develop -c cargo sweep --version
+WORKDIR /
+RUN rm -rf /warm
+
+# FOLLOW-UP optimisation (intentionally NOT done here, see CI notes): cargo
+# dependency + target caching. Each CI run still compiles the ~296-crate graph
+# from scratch and pulls crate sources from crates.io. A later pass can bake
+# `cargo fetch` (offline crate sources) and/or a warmed target dir, or wire
+# sccache, to cut run time. Correctness/first-green first; speed next.

.gitea/workflows/build-ci-image.yaml

@@ -0,0 +1,51 @@
+# Builds the nix CI toolchain image (.gitea/ci-image/Dockerfile) and pushes it
+# to the Gitea registry. The gate (ci.yaml) runs *inside* this image, so this
+# workflow is the gate's prerequisite. It only needs to run when the image's
+# inputs change — the Dockerfile, the flake, or the toolchain pin — plus on
+# manual dispatch.
+#
+# DinD pattern: plain docker:27-dind (one of the tested ci-test samples). No
+# registry proxy here — the runner's containers have direct internet egress
+# (the ci-probe run cloned github.com and pulled docker.io with no proxy), and
+# this image's RUN steps fetch from apt + nixos.org, which the proxy isn't
+# guaranteed to forward. The dind-cached:local + REGISTRY_PROXY_HOST variant is
+# a later speed optimisation for base-image pull caching, not needed for green.
+name: build-ci-image
+on:
+  push:
+    # Branch pushes only. Tag pushes ignore `paths:` filters and would rebuild
+    # the (unchanged) image on every release tag — `branches: ['**']` excludes
+    # tags, so this runs only when a branch push actually changes an image input.
+    branches: ['**']
+    paths:
+      - '.gitea/ci-image/Dockerfile'
+      - 'flake.nix'
+      - 'flake.lock'
+      - 'rust-toolchain.toml'
+      - '.gitea/workflows/build-ci-image.yaml'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ci-public
+    services:
+      docker:
+        image: docker:27-dind
+        options: --privileged
+        env:
+          DOCKER_TLS_CERTDIR: ""
+    env:
+      DOCKER_HOST: tcp://docker:2375
+      IMAGE: git.lazyeval.net/oli/rdbms-playground-ci
+    steps:
+      - uses: actions/checkout@v4
+      - name: wait for docker
+        run: until docker version >/dev/null 2>&1; do sleep 1; done
+      - name: registry login
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" \
+            | docker login git.lazyeval.net -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+      - name: build
+        run: docker build -f .gitea/ci-image/Dockerfile -t "$IMAGE:latest" .
+      - name: push
+        run: docker push "$IMAGE:latest"

.gitea/workflows/ci.yaml

@@ -0,0 +1,48 @@
+# The CI gate. Runs inside the prebuilt nix toolchain image (built + pushed by
+# build-ci-image.yaml), so the pinned 1.95.0 toolchain is already warm — steps
+# just enter the flake devShell and run cargo.
+#
+# Gate = fmt + clippy + test. The fmt gate (`cargo fmt --check`, stock defaults)
+# was enabled once the tree was reformatted on main (ADR-ci-002 Amendment 1 /
+# issue #35). The release job (static binary for D2) and the platform matrix
+# layer on later, step by step.
+name: ci
+on:
+  push:
+    # Branch pushes only — a tag push hits the same commit the branch push
+    # already gated, so `branches: ['**']` drops the redundant tag-triggered
+    # run (the release workflow owns tags). Pushing commits + a tag together
+    # still gates the commits via the branch push.
+    branches: ['**']
+    # Skip the gate for changes that can't affect clippy/test — docs, markdown,
+    # and the website subproject (it has its own workflow, website.yaml, that
+    # builds + publishes it). A push touching crate code *and* these still runs
+    # (paths-ignore only skips when *all* changed files match).
+    # Note: flake/toolchain changes are NOT ignored — they can shift the
+    # toolchain and thus lint/test outcomes.
+    paths-ignore:
+      - 'docs/**'
+      - '**/*.md'
+      - 'website/**'
+      - '.gitea/workflows/website.yaml'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**/*.md'
+      - 'website/**'
+      - '.gitea/workflows/website.yaml'
+
+jobs:
+  gate:
+    runs-on: ci-public
+    # Public package → anonymous pull, no credentials needed.
+    container:
+      image: git.lazyeval.net/oli/rdbms-playground-ci:latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: fmt (check, stock defaults)
+        run: nix develop -c cargo fmt --check
+      - name: clippy (warnings denied)
+        run: nix develop -c cargo clippy --all-targets -- -D warnings
+      - name: test
+        run: nix develop -c cargo test --no-fail-fast

.gitea/workflows/publish.yaml

@@ -0,0 +1,79 @@
+# Manual publication workflow (workflow_dispatch) — the outward, irreversible
+# release steps a human triggers AFTER the automated `release.yaml` build has
+# produced downloadable assets (and they've been eyeballed as good).
+#
+# Why manual + separate from release.yaml:
+#   * Publishing to a public registry is irreversible (crates.io versions can
+#     only be *yanked*, never deleted) — a human pulls this lever, and the
+#     registry token never sits on every tag push.
+#   * Our release is split (Linux/Windows on the tag, macOS dispatched), so a
+#     human is the natural "all assets are up — go" gate. crates.io publish
+#     reads SOURCE so it doesn't strictly need the release, but binstall's
+#     metadata points at the release assets — hence run this once builds exist.
+#
+# Structure: each registry is its OWN job with NO inter-job `needs`, so jobs run
+# independently and one failing (or a newly-added one) never breaks another.
+# Every job is IDEMPOTENT — re-dispatching when a target is already published is
+# a clean no-op. Add Scoop / Homebrew / winget as sibling jobs here later.
+name: publish
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag to publish (e.g. v0.2.0)'
+        required: true
+
+jobs:
+  crates-io:
+    runs-on: ci-public
+    container:
+      image: git.lazyeval.net/oli/rdbms-playground-ci:latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.tag }}
+
+      - name: publish to crates.io (idempotent)
+        shell: bash
+        env:
+          TAG: ${{ inputs.tag }}
+          # A crate-scoped, publish-update crates.io token, stored as a Gitea
+          # Actions secret. `cargo publish` reads CARGO_REGISTRY_TOKEN from env.
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          set -euo pipefail
+
+          # Source of truth = the [package] version at the checked-out tag
+          # (toolchain-free read; same approach as release.yaml's guard, which
+          # avoids the flake devShell's stdout banner corrupting a parse).
+          VER=$(grep -m1 '^version = ' Cargo.toml | sed -E 's/^version = "(.*)"/\1/')
+          [ -n "$VER" ] || { echo "ERROR: could not read version from Cargo.toml" >&2; exit 1; }
+          if [ "$TAG" != "v$VER" ]; then
+            echo "ERROR: dispatch tag '$TAG' != 'v$VER' (Cargo.toml at that tag)" >&2
+            exit 1
+          fi
+
+          # Idempotency: if this version is already on crates.io, no-op.
+          # (crates.io requires a descriptive User-Agent per its data policy;
+          # without one the API returns 403.) Only an explicit 200 means
+          # "already there" — anything else proceeds, and `cargo publish` is the
+          # final backstop (it refuses to overwrite an existing version).
+          UA="rdbms-playground-release-ci (oliver@sturmnet.org)"
+          code=$(curl -sS -o /dev/null -w '%{http_code}' -A "$UA" \
+            "https://crates.io/api/v1/crates/rdbms-playground/$VER" || echo 000)
+          if [ "$code" = "200" ]; then
+            echo "rdbms-playground $VER is already on crates.io — nothing to do."
+            exit 0
+          fi
+          echo "crates.io returned HTTP $code for $VER (not 200) — proceeding to publish."
+
+          echo "publishing rdbms-playground $VER to crates.io ..."
+          nix develop -c cargo publish --locked
+          echo "published rdbms-playground $VER to crates.io."
+
+  # Future manual publication targets go here as independent, idempotent jobs,
+  # e.g.:
+  #   scoop-bucket:   { ... update the lazyeval Scoop bucket manifest ... }
+  #   homebrew-tap:   { ... update the lazyeval Homebrew formula ... }
+  #   winget:         { ... komac submit, or a manual PR helper ... }
+  # No `needs:` between them — each checks the target and skips if already done.

.gitea/workflows/release-macos.yaml

@@ -0,0 +1,104 @@
+# macOS release leg — the two *-apple-darwin binaries, built natively on the
+# Tart (Apple-Silicon) runner and attached to an existing Gitea release.
+#
+# Manual dispatch only: the Mac runner is intermittent, so this is triggered by
+# hand (with the Mac up) for a given release tag. The 4-target Linux/Windows
+# release (release.yaml) runs on the tag itself and never waits on the Mac, so a
+# release always has those four; the macOS two are added by dispatching this.
+#
+# NOTE: Gitea exposes workflow_dispatch only for workflows on the DEFAULT branch,
+# so this becomes triggerable once the CI work is merged to `main`.
+name: release-macos
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag to build the macOS binaries for and attach to (e.g. v0.1.0)'
+        required: true
+
+jobs:
+  release-macos:
+    runs-on: macos
+    env:
+      NIX_CONFIG: "experimental-features = nix-command flakes"
+      TAG: ${{ inputs.tag }}
+      # Auto-provided by Gitea Actions; has repo write (release) scope.
+      TOKEN: ${{ secrets.GITEA_TOKEN }}
+      API: ${{ github.server_url }}/api/v1
+      REPO: ${{ github.repository }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.tag }}
+
+      - name: test
+        run: nix develop -c cargo test --no-fail-fast
+
+      - name: build, de-nix, sign, package + publish
+        run: |
+          set -e
+          mkdir -p dist
+          for t in aarch64-apple-darwin x86_64-apple-darwin; do
+            echo "==================== $t ===================="
+            nix develop -c cargo build --release --target "$t"
+            f="target/$t/release/rdbms-playground"
+
+            # Rewrite the nix-store libiconv load path to the system one, then
+            # re-sign ad-hoc (install_name_tool invalidates the signature; arm64
+            # requires a valid one). Guard against any remaining /nix/store dep.
+            for l in $(otool -L "$f" | awk '/\/nix\/store.*libiconv.*dylib/ {print $1}'); do
+              install_name_tool -change "$l" /usr/lib/libiconv.2.dylib "$f"
+            done
+            codesign --force --sign - "$f"
+            if otool -L "$f" | grep -q /nix/store; then
+              echo "ERROR: $t binary links a /nix/store dylib"; exit 1
+            fi
+
+            out="rdbms-playground-$TAG-$t"
+            cp "$f" "dist/$out"
+            ( cd dist && shasum -a 256 "$out" > "$out.sha256" )   # macOS: shasum, not sha256sum
+          done
+          ls -l dist
+
+          # Idempotent create-or-get the release (release.yaml likely created it
+          # already from the tag), then upload the two macOS binaries + checksums.
+          created=$(curl -sS -X POST "$API/repos/$REPO/releases" \
+            -H "Authorization: token $TOKEN" -H "Content-Type: application/json" \
+            -d "{\"tag_name\":\"$TAG\",\"name\":\"$TAG\",\"body\":\"Automated release for $TAG.\"}")
+          id=$(printf '%s' "$created" | node -e 'let s="";process.stdin.on("data",d=>s+=d).on("end",()=>{try{const o=JSON.parse(s);process.stdout.write(String(o.id||""))}catch(e){}})')
+          if [ -z "$id" ]; then
+            id=$(curl -sS "$API/repos/$REPO/releases/tags/$TAG" \
+              -H "Authorization: token $TOKEN" \
+              | node -e 'let s="";process.stdin.on("data",d=>s+=d).on("end",()=>{process.stdout.write(String(JSON.parse(s).id))})')
+          fi
+          echo "release id: $id"
+          for fa in dist/*; do
+            name=$(basename "$fa")
+            echo "uploading $name"
+            curl -sS -X POST "$API/repos/$REPO/releases/$id/assets?name=$name" \
+              -H "Authorization: token $TOKEN" -F "attachment=@$fa" > /dev/null
+          done
+          echo "published macOS assets for $TAG"
+
+      - name: prune nix store — keep the last 2 toolchain generations
+        # The runner wipes the workspace each run, so cargo target/ never
+        # accumulates. Bound the persistent nix store by generation: record the
+        # current devShell as a generation of a persistent profile (in $HOME),
+        # keep the 2 newest, reclaim what older ones referenced — so the
+        # toolchain stays *warm* across runs and only stale generations are GC'd.
+        #
+        # The profile's parent dir MUST exist first, or `nix develop --profile`
+        # errors ("cannot read directory …") and the profile/gc-root is never
+        # created — which made `nix-collect-garbage` delete the whole toolchain
+        # closure every run (re-downloaded ~3.8 GiB each time; the retention was
+        # silently broken by the swallowed `|| true`). No `|| true` on the
+        # profile realization now: a future breakage should fail loudly.
+        if: always()
+        run: |
+          echo "--- disk before ---"; df -h / | tail -1
+          P="$HOME/.cache/rdbms-ci/toolchain"
+          mkdir -p "$(dirname "$P")"
+          nix develop --profile "$P" -c true
+          nix-env -p "$P" --delete-generations +2 || true
+          nix-collect-garbage || true
+          echo "--- disk after ---"; df -h / | tail -1

.gitea/workflows/release.yaml

@@ -0,0 +1,117 @@
+# Release: on a version tag, build the cross-platform binaries and publish them
+# to a Gitea release with checksums. Runs in the prebuilt CI image, so the
+# pinned toolchain + the release targets + cargo-zigbuild/zig are already warm.
+#
+# Matrix (D1, cross-built from Linux x86_64 via cargo-zigbuild):
+#   x86_64-unknown-linux-musl   aarch64-unknown-linux-musl   (static, D2)
+#   x86_64-pc-windows-gnu       aarch64-pc-windows-gnullvm   (standalone .exe)
+# The two macOS targets are built separately by the dispatched
+# release-macos.yaml (native Tart runner; ADR-ci-003 amendment), uploading to
+# the same release. D3 package-manager manifests layer on later.
+#
+# Tests run once (host) before the matrix, so a tag can never publish untested
+# code, even one pointing at a commit that was never gated on a branch. The
+# version guard (ADR-0054) refuses to publish a tag whose vX.Y.Z disagrees with
+# Cargo.toml's version, keeping `--version`, the release name, and the asset in
+# lockstep.
+name: release
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  test:
+    runs-on: ci-public
+    container:
+      image: git.lazyeval.net/oli/rdbms-playground-ci:latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: version guard — tag must equal Cargo.toml version (ADR-0054)
+        shell: bash
+        env:
+          TAG: ${{ github.ref_name }}
+        run: |
+          set -euo pipefail
+          # Read the [package] version straight from Cargo.toml — toolchain-free
+          # and robust. (An earlier `nix develop -c cargo metadata | node` version
+          # broke: the flake devShell prints a banner to stdout, corrupting the
+          # JSON pipe.) `^version = ` is anchored, so it matches only the package
+          # version, never the `version = ` inside dependency inline tables.
+          VER=$(grep -m1 '^version = ' Cargo.toml | sed -E 's/^version = "(.*)"/\1/')
+          echo "tag=$TAG  cargo=v$VER"
+          if [ -z "$VER" ]; then
+            echo "ERROR: could not read the package version from Cargo.toml" >&2
+            exit 1
+          fi
+          if [ "$TAG" != "v$VER" ]; then
+            echo "ERROR: release tag '$TAG' != 'v$VER' (Cargo.toml). Bump Cargo.toml to the release version, commit, then retag (ADR-0054)." >&2
+            exit 1
+          fi
+      - name: test
+        run: nix develop -c cargo test --no-fail-fast
+
+  build:
+    needs: test
+    runs-on: ci-public
+    container:
+      image: git.lazyeval.net/oli/rdbms-playground-ci:latest
+    strategy:
+      fail-fast: false
+      matrix:
+        target:
+          - x86_64-unknown-linux-musl
+          - aarch64-unknown-linux-musl
+          - x86_64-pc-windows-gnu
+          - aarch64-pc-windows-gnullvm
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: build
+        run: nix develop -c cargo zigbuild --release --target ${{ matrix.target }}
+
+      - name: package + publish
+        # Pin bash: the runner defaults scripted steps to dash, which rejects
+        # `set -o pipefail`. bash is in the CI image.
+        shell: bash
+        env:
+          TARGET: ${{ matrix.target }}
+          # GITEA_TOKEN is auto-provided with repo write (release) scope.
+          TOKEN: ${{ secrets.GITEA_TOKEN }}
+          API: ${{ github.server_url }}/api/v1
+          REPO: ${{ github.repository }}
+          TAG: ${{ github.ref_name }}
+        run: |
+          set -euo pipefail
+
+          # Windows targets produce a .exe; the rest a bare binary.
+          case "$TARGET" in *windows*) EXT=.exe ;; *) EXT= ;; esac
+          BIN="target/$TARGET/release/rdbms-playground$EXT"
+          OUT="rdbms-playground-$TAG-$TARGET$EXT"
+          mkdir -p dist
+          cp "$BIN" "dist/$OUT"
+          ( cd dist && sha256sum "$OUT" > "$OUT.sha256" )
+          ls -l dist
+
+          # Create the release for this tag; if a sibling matrix job already
+          # created it, look it up instead (idempotent + race-tolerant).
+          created=$(curl -sS -X POST "$API/repos/$REPO/releases" \
+            -H "Authorization: token $TOKEN" \
+            -H "Content-Type: application/json" \
+            -d "{\"tag_name\":\"$TAG\",\"name\":\"$TAG\",\"body\":\"Automated release for $TAG.\"}")
+          id=$(printf '%s' "$created" | node -e 'let s="";process.stdin.on("data",d=>s+=d).on("end",()=>{try{const o=JSON.parse(s);process.stdout.write(String(o.id||""))}catch(e){}})')
+          if [ -z "$id" ]; then
+            id=$(curl -sS "$API/repos/$REPO/releases/tags/$TAG" \
+              -H "Authorization: token $TOKEN" \
+              | node -e 'let s="";process.stdin.on("data",d=>s+=d).on("end",()=>{process.stdout.write(String(JSON.parse(s).id))})')
+          fi
+          echo "release id: $id"
+
+          for f in dist/*; do
+            name=$(basename "$f")
+            echo "uploading $name"
+            curl -sS -X POST "$API/repos/$REPO/releases/$id/assets?name=$name" \
+              -H "Authorization: token $TOKEN" \
+              -F "attachment=@$f" > /dev/null
+          done
+          echo "published $TARGET assets for $TAG"

.gitea/workflows/website.yaml

@@ -0,0 +1,66 @@
+# Build the docs/marketing website and deploy it to Cloudflare Pages.
+#
+# One Pages project, two branches (no second project, no sub-folders — Pages
+# maps a branch to a *subdomain alias*, not a path):
+#   main    → production   (the project's production branch → relplay.org)
+#   website → preview      (alias `website.<project>.pages.dev`; a custom
+#                           `staging.relplay.org` can be attached to it)
+# wrangler treats `--branch=<production-branch>` as a production deploy and any
+# other branch as a preview, so a single workflow covers both — the Pages
+# project's production branch MUST be set to `main`.
+#
+# Pure-Node build: the `.cast` recordings are committed, so no cargo/Rust is
+# needed here. Runs on the bare `ci-public` runner (node already present; pnpm
+# via corepack, pinned by package.json's `packageManager`). No job container —
+# unlike the Rust gate, this needs none.
+#
+# Required Actions secrets (set once in the repo/org settings):
+#   CLOUDFLARE_API_TOKEN   — token with "Cloudflare Pages: Edit" on the account
+#   CLOUDFLARE_ACCOUNT_ID  — the account id that owns the Pages project
+name: website
+on:
+  push:
+    branches: [main, website]
+    # Only when the site (or this workflow) actually changes — crate-only
+    # pushes don't redeploy the site.
+    paths:
+      - 'website/**'
+      - '.gitea/workflows/website.yaml'
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ci-public
+    defaults:
+      run:
+        working-directory: website
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: preflight — toolchain present
+        run: |
+          node --version
+          corepack --version
+
+      - name: enable pnpm (pinned by packageManager)
+        run: corepack enable
+
+      - name: install
+        run: pnpm install --frozen-lockfile
+
+      - name: build
+        run: pnpm build
+
+      - name: deploy to Cloudflare Pages
+        shell: bash
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          BRANCH: ${{ github.ref_name }}
+        run: |
+          set -euo pipefail
+          # `dist` is relative to website/ (the working-directory). The branch
+          # name decides production (main) vs preview (anything else).
+          npx --yes wrangler@4 pages deploy dist \
+            --project-name=relplay \
+            --branch="$BRANCH"

.gitignore

@@ -2,11 +2,23 @@
 /target
 **/*.rs.bk
 
+# Nix
+# `nix build` output symlinks (`result`, `result-<name>`), direnv's cached env
+/result
+/result-*
+.direnv/
+
 # Snapshot test review files
 *.snap.new
 *.pending-snap
 
+# Website tooling — Cloudflare Wrangler local cache/state (regenerable;
+# CI deploys from website/, this dir only appears on a local wrangler run)
+.wrangler/
+
 # Editor / OS
 .DS_Store
 *.swp
 *.swo
+# Astro/template-seeded editor configs we don't track (e.g. website/.vscode)
+.vscode/

CLAUDE.md

@@ -37,9 +37,9 @@ Current decisions at a glance (each backed by an ADR):
   simple to advanced (ADR-0003). No other sigils.
 - **Project format:** `project.yaml` + `data/<table>.csv` +
   `history.log`; `playground.db` is a derived artifact (ADR-0004,
-  amended by ADR-0015). Implemented through Iteration 4 +
-  cleanup; export/import (Iter 5) and migration framework /
-  --resume / persistent input history (Iter 6) pending.
+  amended by ADR-0015). Fully implemented (ADR-0015 Iterations
+  1–6): export/import, `--resume`, persistent input history, and
+  the migration framework scaffold are all done.
 - **Project storage runtime:** every command persists through to
   db + yaml + csv + history.log in one execution context, gated
   by the combined db persistence logic; commit-db-last ordering
@@ -108,41 +108,87 @@ Current decisions at a glance (each backed by an ADR):
   SQL `select` / `with` / `insert` / `update` / `delete`
   (ADR-0039). `EXPLAIN QUERY PLAN` never executes, so
   explaining a destructive command is safe.
+- **Continuous integration & release** (developed on the `ci` branch,
+  **merged to `main` 2026-06-15**; decisions in `docs/ci/adr/` —
+  **ADR-ci-001/002/003**, a namespace kept separate from the main ADR
+  sequence to avoid cross-branch number collisions, like the website's):
+  a self-hosted
+  **Gitea Actions** pipeline built on a **nix flake** (pinned Rust
+  `1.95.0` — one source of toolchain for dev *and* CI) plus a
+  prebuilt CI image. **Gate** (`ci.yaml`): `clippy -D warnings` +
+  `cargo test` on every branch push / PR. **Release** on a `v*` tag
+  (`release.yaml`): the four non-macOS **D1** targets cross-built
+  with `cargo-zigbuild` (Linux musl static + standalone Windows
+  `.exe`); the two macOS targets via the **dispatched**
+  `release-macos.yaml` on a Tart Apple-Silicon runner (de-nix the
+  `libiconv` load path + ad-hoc re-sign). All published to a Gitea
+  release with `.sha256`s. **`fmt` is intentionally not gated yet**
+  (the tree isn't stock-`rustfmt`-clean). Now that this is on `main`,
+  `release-macos` is dispatchable (`workflow_dispatch` is
+  Gitea-default-branch-only) — **dispatched and verified working**: the
+  macOS build + de-nix/re-sign + upload runs end-to-end and the binaries
+  launch.
+- **Website & docs site** (developed on the `website` branch, **merged
+  to `main`**; the branch **stays open** for future staging deploys;
+  decisions in `docs/website/adr/` — **ADR-website-001**, its own
+  namespace like CI's): an **Astro + Starlight + Tailwind** marketing
+  landing page plus the **canonical** user docs, under `website/`.
+  Showcase demos are **asciinema casts** (a scripted-input driver, paced
+  + re-recordable — *not* `history.log` replay; the `--demo` overlay,
+  ADR-0047, dresses them). **Deployed to Cloudflare Pages via Gitea
+  Actions** (`.gitea/workflows/website.yaml`; the crate gate is skipped
+  for website-only changes). Two copy rules bind user-facing text: **no
+  engine name** (continues ADR-0002) and **no "DSL"** (say "simple mode"
+  / "advanced mode"). Install docs are still partial — package-manager
+  manifests + some installation instructions are pending (`requirements.md`
+  D3 / DOC1).
 
 ## Repository layout
 
 ```
 .
-├── Cargo.toml                 # dependencies, lints (nursery)
-├── CLAUDE.md                  # this file
+├── Cargo.toml / Cargo.lock     # dependencies, lints (nursery)
+├── CLAUDE.md                   # this file
+├── flake.nix / flake.lock      # pinned Rust toolchain, one source for dev + CI (ADR-ci-002)
+├── rust-toolchain.toml         # toolchain pin
+├── .gitea/                     # Gitea Actions workflows + prebuilt CI image (ADR-ci-001..003, website)
+├── ci/                         # CI build helpers (e.g. winstub/ — Windows link stub)
 ├── docs/
-│   ├── adr/                   # all decision records (read 0000 first)
-│   ├── handoff/               # session-handover notes
-│   └── requirements.md        # the Phase-1 checklist with progress
+│   ├── adr/                    # project-wide decision records (read 0000 first)
+│   ├── ci/{adr,handoff}/       # CI subproject ADRs (ci-001..003) + handoffs
+│   ├── website/{adr,plans}/    # website subproject ADRs (website-001) + plan
+│   ├── handoff/                # session-handover notes
+│   ├── plans/                  # working plans
+│   └── requirements.md         # the Phase-1 checklist with progress
 ├── src/
-│   ├── action.rs              # Action enum (Quit / ExecuteDsl)
-│   ├── app.rs                 # App state + pure update() + Tier-1 tests
-│   ├── cli.rs                 # CLI args (--theme, --log-file)
-│   ├── db.rs                  # rusqlite worker, all DDL/DML, metadata tables
+│   ├── action.rs               # Action enum (Quit / ExecuteDsl / …)
+│   ├── app.rs                  # App state + pure update() + Tier-1 tests
+│   ├── cli.rs                  # CLI args (--theme, --log-file, --demo, --no-undo, --resume, …)
+│   ├── clipboard.rs            # copy output to the system clipboard
+│   ├── completion.rs           # Tab completion + schema cache
+│   ├── db.rs                   # rusqlite worker, all DDL/DML, metadata tables
 │   ├── dsl/
-│   │   ├── action.rs          # ReferentialAction enum + parsing
-│   │   ├── command.rs         # Command AST + RelationshipSelector + RowFilter
-│   │   ├── mod.rs             # re-exports
-│   │   ├── parser.rs          # parse entry point → unified-grammar walker
-│   │   ├── shortid.rs         # base58 generator + validator
-│   │   ├── types.rs           # user-facing Type enum + fk_target_type
-│   │   └── value.rs           # Value/Bound + per-type validation
-│   ├── event.rs               # AppEvent (input + DSL outcomes)
-│   ├── lib.rs                 # module re-exports for tests
-│   ├── logging.rs             # tracing setup, file-backed
-│   ├── main.rs                # binary entry; thin
-│   ├── mode.rs                # Simple/Advanced mode enum
-│   ├── runtime.rs             # Tokio loop, terminal setup, dispatch
-│   ├── snapshots/             # insta snapshots for Tier-2 tests
-│   ├── theme.rs               # light/dark themes
-│   └── ui.rs                  # ratatui rendering
-└── tests/
-    └── walking_skeleton.rs    # Tier-3 integration tests
+│   │   ├── grammar/            # hand-rolled unified grammar nodes (DSL + SQL)
+│   │   ├── walker/             # grammar walker (driver / context / highlight / outcome)
+│   │   ├── command.rs parser.rs types.rs value.rs action.rs shortid.rs sql_functions.rs
+│   ├── echo.rs                 # command echo / SQL rendering
+│   ├── event.rs                # AppEvent (input + DSL outcomes)
+│   ├── friendly/               # friendly-error layer + string catalog (strings/en-US.yaml) + keys
+│   ├── input_render.rs         # input-field render + ambient hint classification
+│   ├── output_render.rs        # output-panel render helpers (incl. relationship diagrams)
+│   ├── logging.rs main.rs mode.rs runtime.rs   # tracing / entry / mode enum / Tokio loop
+│   ├── persistence/            # csv + yaml + history IO + migrations
+│   ├── project/                # open/create, lock, naming, prettifier
+│   ├── seed/                   # seed generators / heuristics / vocabulary (ADR-0048)
+│   ├── snapshots/              # insta snapshots for Tier-2 tests
+│   ├── theme.rs type_change.rs ui.rs undo.rs   # themes / column type-change / render / undo ring
+│   └── lib.rs                  # module re-exports for tests
+├── tests/
+│   ├── it/                     # Tier-3 integration tests (consolidated into one binary)
+│   └── typing_surface_matrix.rs  # typing-surface matrix (separate Tier-3 target)
+└── website/                    # Astro + Starlight docs/marketing site (ADR-website-001)
+    ├── src/ public/ casts-src/ # pages + assets + asciinema cast sources
+    └── astro.config.mjs package.json …   # deploys to Cloudflare Pages via Gitea Actions
 ```
 
 Key invariants in the code:
@@ -165,7 +211,10 @@ Key invariants in the code:
   ADR. In-flight discussion stays in conversation or issues
   until it settles. The ADR-0000 index-upkeep rule applies:
   every ADR change updates `docs/adr/README.md` in the same
-  edit.
+  edit. ADR **numbers** are assigned at merge-to-`main` (draft
+  under a placeholder `ADR-XXXX` / `draft-<slug>.md` on a
+  branch) to avoid cross-branch collisions — see ADR-0000
+  "Numbering discipline".
 - **Issue tracking.** Bugs and enhancements are filed as Gitea
   issues (see *Issue tracking — Gitea via `tea`* below).
   `docs/requirements.md` and the ADRs remain the source of truth
@@ -318,16 +367,8 @@ all of `target/`, forcing a full from-scratch rebuild).
 These are explicitly tracked (mostly in `requirements.md`) but
 not yet implemented:
 
-- **Project storage** (track 2): largely implemented through
-  Iteration 4 + cleanup pass + safety hardening (Iterations
-  1–4 of ADR-0015). Pending pieces: `export` / `import` (Iter
-  5), `--resume` + persistent input history hydration +
-  migration framework scaffold (Iter 6).
 - **Modify relationship** (C3a): drop+add covers the use case
   today.
-- **m:n convenience** (C4): auto-generates a junction table
-  with appropriate FKs — depends on relationships being solid
-  (they are).
 - **Strong syntax-help in parse errors** (H1a): point users at
   missing keywords/clauses rather than the unexpected
   character. *(H1 — the friendly **database**-error layer — is
@@ -338,14 +379,17 @@ not yet implemented:
 - **Session log + Markdown export** (V4): the bigger UX
   project — scrollable session journal, smart structure
   rendering, save-as-markdown.
-- **Readline shortcuts** (I1b): Ctrl-A/Ctrl-E, Ctrl-W/Ctrl-K/
-  Ctrl-U.
 - **Multi-line input** (I1): Enter inserts newline,
   Ctrl-Enter submits.
-- **Tab completion** (I3), **syntax highlighting** (I4).
 - **ER diagram export** (V3).
-- **CI** (TT5): test infrastructure exists; CI workflow not
-  yet configured.
+- **Full TT5** (CI): the pipeline is live (see the CI decision
+  above / `docs/ci/adr/`), but "all tiers on all OSes" isn't
+  complete — **Windows is build-only** (cross-compiled, not
+  executed: no Windows runner) and **Tier 4** (PTY, TT4) isn't
+  wired in CI.
+- **D3 packaging**: prebuilt binaries + checksums ship to Gitea
+  releases, but the Homebrew / Scoop / winget / `cargo binstall`
+  manifests are not done.
 
 ## Handoff notes
 

CONTRIBUTING.md

@@ -0,0 +1,20 @@
+# Contributing to rdbms-playground
+
+Contributions are welcome — bug reports, ideas, and pull requests. The
+project lives on Gitea at
+<https://git.lazyeval.net/oli/rdbms-playground>; please file issues and
+open pull requests there. It's approaching its first public release, so
+the most useful contributions right now are bug reports and rough edges
+you hit while learning.
+
+## License of contributions
+
+Unless you explicitly state otherwise, any contribution you intentionally
+submit for inclusion in this project — as defined in the Apache-2.0
+license — shall be **dual-licensed under `MIT OR Apache-2.0`** (the
+project's licenses), without any additional terms or conditions.
+
+This is the standard Rust "inbound = outbound" arrangement: your
+contribution is offered under the same licenses the project distributes
+under, so — via Apache-2.0 §5 — it carries the Apache-2.0 §3 patent grant
+to all users. No separate CLA is required.

Cargo.lock

@@ -1535,7 +1535,7 @@ dependencies = [
 
 [[package]]
 name = "rdbms-playground"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "anyhow",
  "arboard",

Cargo.toml

@@ -1,12 +1,21 @@
 [package]
 name = "rdbms-playground"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2024"
 description = "A cross-platform TUI playground for learning relational databases."
 license = "MIT OR Apache-2.0"
 repository = "https://git.lazyeval.net/oli/rdbms-playground"
+homepage = "https://relplay.org"
 readme = "README.md"
-publish = false
+keywords = ["database", "sql", "tui", "learning", "playground"]
+categories = ["command-line-utilities", "database"]
+# Keep the published crate to the code that builds the binary — the website,
+# decision records, and CI plumbing are repo-only (ADR-0056).
+exclude = ["/website", "/docs", "/.gitea", "/.codegraph"]
+# `publish = false` removed (ADR-0056): the crate is intended for
+# crates.io. The actual `cargo publish` is a deliberate, irreversible
+# maintainer step (needs the crates.io token) — do it at a tagged release
+# whose assets the binstall metadata below points at.
 
 [dependencies]
 anyhow = "1.0.102"
@@ -68,6 +77,12 @@ tempfile = "3.27.0"
 incremental = false
 debug = "line-tables-only"
 
+# Release builds back the distributed binaries (D2: single static binary).
+# strip = "symbols" drops the symbol table at link time so the shipped artifact
+# is lean (≈13 MB → 10 MB for the musl build) without a separate strip step.
+[profile.release]
+strip = "symbols"
+
 [lints.rust]
 unsafe_code = "forbid"
 unreachable_pub = "warn"
@@ -79,3 +94,33 @@ nursery = { level = "warn", priority = -1 }
 module_name_repetitions = "allow"
 missing_errors_doc = "allow"
 missing_panics_doc = "allow"
+
+# cargo-binstall (ADR-0056): let `cargo binstall rdbms-playground` fetch the
+# prebuilt release binary instead of compiling from source. Our release assets
+# are BARE binaries (no archive) named `rdbms-playground-v<version>-<target>`
+# (`.exe` on Windows) with `.sha256` sidecars (ADR-ci-003), so `pkg-fmt = "bin"`.
+# `{ version }` excludes the leading `v`, so the template spells `v{ version }`.
+#
+# Target mapping: macOS host triples match our asset triples directly. But we
+# ship the fully-static *-linux-MUSL build (glibc hosts are *-linux-gnu) and
+# *-windows-GNU/GNULLVM (most Windows hosts are *-msvc), so those common host
+# triples need explicit overrides pointing at the asset we actually publish.
+#
+# NOTE: unverified against a real `cargo binstall` run (binstall isn't a dep and
+# nothing is on crates.io yet) — validate at the first publish + matching release.
+[package.metadata.binstall]
+pkg-url = "{ repo }/releases/download/v{ version }/{ name }-v{ version }-{ target }{ archive-suffix }"
+pkg-fmt = "bin"
+bin-dir = "{ bin }{ binary-ext }"
+
+[package.metadata.binstall.overrides.x86_64-unknown-linux-gnu]
+pkg-url = "{ repo }/releases/download/v{ version }/{ name }-v{ version }-x86_64-unknown-linux-musl"
+
+[package.metadata.binstall.overrides.aarch64-unknown-linux-gnu]
+pkg-url = "{ repo }/releases/download/v{ version }/{ name }-v{ version }-aarch64-unknown-linux-musl"
+
+[package.metadata.binstall.overrides.x86_64-pc-windows-msvc]
+pkg-url = "{ repo }/releases/download/v{ version }/{ name }-v{ version }-x86_64-pc-windows-gnu.exe"
+
+[package.metadata.binstall.overrides.aarch64-pc-windows-msvc]
+pkg-url = "{ repo }/releases/download/v{ version }/{ name }-v{ version }-aarch64-pc-windows-gnullvm.exe"

LICENSE-APACHE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
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+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+      file or class name and description of purpose be included on the
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+
+   Copyright 2026 Lazy Evaluation Ltd
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Lazy Evaluation Ltd
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,98 @@
+# rdbms-playground
+
+A cross-platform terminal app for **learning relational database
+concepts** — tables, columns, primary and foreign keys, relationships,
+indexes, queries, and query plans — in a safe sandbox.
+
+It's a teaching tool, not a database administration tool. It meets
+beginners with guided, keyword-based commands (**simple mode**) and grows
+with them to raw SQL (**advanced mode**), so the same playground works
+from "what is a primary key?" through to writing real queries and reading
+their execution plans.
+
+Website & documentation: **<https://relplay.org>**
+
+## Install
+
+### One line (Linux / macOS)
+
+```sh
+curl -fsSL https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.sh | sh
+```
+
+Detects your OS and CPU, downloads the matching release binary, verifies
+its SHA-256 checksum, and installs it to `~/.local/bin`. Set
+`RDBMS_INSTALL_DIR` to install elsewhere, or `RDBMS_VERSION=vX.Y.Z` to
+pin a version. (Prefer to read before you run? The script lives at
+`scripts/install.sh`.)
+
+### One line (Windows, PowerShell)
+
+```powershell
+irm https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.ps1 | iex
+```
+
+Downloads the matching `.exe`, verifies its checksum, installs to
+`%LOCALAPPDATA%\Programs\rdbms-playground`, and adds it to your user
+PATH. Or use a package manager (Scoop / winget) once those land.
+
+### With `cargo binstall`
+
+If you have [`cargo-binstall`](https://github.com/cargo-bins/cargo-binstall)
+(install it first — it is not part of `cargo` itself):
+
+```sh
+cargo binstall rdbms-playground
+```
+
+### From source
+
+```sh
+cargo install rdbms-playground          # from crates.io
+# or, from a clone:
+cargo build --release                   # binary at target/release/rdbms-playground
+```
+
+### Prebuilt binaries
+
+Every release publishes static Linux, standalone Windows, and macOS
+binaries (x86_64 and aarch64) with `.sha256` checksums on the
+[releases page](https://git.lazyeval.net/oli/rdbms-playground/releases).
+Windows users can also use the binary directly (package-manager support
+is planned).
+
+## A quick taste
+
+```
+create table Customers with pk id(serial)
+add column Customers: name (text)
+add column Customers: email (text)
+insert into Customers values ('Ann', 'ann@example.io')
+show data Customers
+```
+
+Press **F1** while typing for a contextual hint about the command you're
+building, or type `help` for the full command list. Switch to raw SQL
+with `mode advanced` (or prefix a single line with `:`).
+
+## Project status
+
+Approaching its first public release. See the website for current
+features; installation via package managers (Homebrew, Scoop, winget) is
+on the roadmap.
+
+## License
+
+Dual-licensed under either of
+
+- MIT license ([LICENSE-MIT](LICENSE-MIT))
+- Apache License 2.0 ([LICENSE-APACHE](LICENSE-APACHE))
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual-licensed as above, without any additional terms or
+conditions. See [CONTRIBUTING.md](CONTRIBUTING.md).

ci/winstub/README.md

@@ -0,0 +1,30 @@
+# `ci/winstub/` — empty Windows import-lib stub
+
+`libsynchronization.a` here is an **empty `ar` archive** (8 bytes: `!<arch>\n`),
+referenced by `.cargo/config.toml` via `-L native=ci/winstub` for the Windows
+release targets.
+
+## Why
+
+The D1 release matrix cross-compiles Windows binaries from Linux with
+`cargo zigbuild` (see `docs/ci/adr/`). Rust's `std` links `-lsynchronization`
+for its `WaitOnAddress`-based thread parking. That import library is normally
+provided by Rust's `rust-mingw` "self-contained" component — which `rust-overlay`
+does not ship — and Zig's bundled mingw doesn't carry it either, so the link
+fails with:
+
+```
+error: unable to find dynamic system library 'synchronization'
+```
+
+The functions it would import (`WaitOnAddress`, `WakeByAddressSingle`,
+`WakeByAddressAll`) are **forwarded by `kernel32.dll`**, which is already linked,
+so they resolve at link and run time without a real `synchronization` import
+library. An **empty** stub is therefore sufficient: it satisfies the `-l`
+lookup and contributes no symbols.
+
+## Regenerating
+
+```
+zig ar rcs ci/winstub/libsynchronization.a
+```

ci/winstub/libsynchronization.a

@@ -0,0 +1 @@
+!<arch>

docs/adr/0000-record-architecture-decisions.md

@@ -38,6 +38,44 @@ The index lists ADRs in numerical order. Each entry shows the
 number, title, and — where relevant — status annotations such as
 "Superseded by ADR-NNNN" or "Deprecated".
 
+## Numbering discipline
+
+ADR numbers are a single global sequence, so two branches can each grab
+"the next number" independently and collide on merge. (This happened when
+the `website` branch's ADR-0042 met `main`'s ADR-0042, resolved by
+renumbering the former to ADR-0044.) To prevent it:
+
+**Assign an ADR's number at merge-to-`main`, not at creation.** While the
+work lives on a non-`main` branch, draft the ADR under a placeholder — an
+`ADR-XXXX` title and a `draft-<slug>.md` filename — and reference it that
+way from any plan or notes. Give it the next free number only when the
+branch merges to `main`, renaming the file and updating its references in
+the same step.
+
+A number is "taken" only once it appears in `main`'s `docs/adr/README.md`,
+which is the single source of truth for the next free number — never
+compute "next" from a feature branch. A branch that genuinely needs a real
+number up front may instead reserve one by landing a stub index entry on
+`main` first, but placeholder-until-merge is the default.
+
+### Subproject ADR namespaces
+
+A long-lived subproject developed on its own branch can escape the shared
+integer pool entirely by keeping its decision records in a **separate
+namespace**, rather than fighting collisions on every merge. The **website**
+(`docs/website/adr/`) is the first: its ADRs use a dated sequence —
+`<date>-adr-website-<NNN>.md`, referenced in prose as `ADR-website-NNN` —
+and are indexed by their own `docs/website/adr/README.md`. Because the
+date-plus-subproject prefix is disjoint from `main`'s integer sequence, a
+website ADR and a `main` ADR can never claim "the same number" again. (This
+namespace was created on 2026-06-10 after the website's ADR collided with
+`main`'s on consecutive numbers — drafted 0042, bumped to 0044, both times
+landing on a number `main` had taken; the move retired it from the pool as
+**ADR-website-001**.) The main `docs/adr/` index carries a pointer to each
+such namespace. Use this for a new subproject only when it is genuinely
+self-contained and branch-isolated; one-off cross-cutting decisions stay in
+the global sequence.
+
 ## Out-of-scope discipline
 
 ADRs (and the plans they spawn) lean heavily on "out of scope" language.

docs/adr/0047-demonstration-overlay-layer.md

@@ -414,5 +414,41 @@ time-boxed-`recv` path. We therefore test the **pure pieces**
 exhaustively (label fn, capture state machine, nearest-deadline helper)
 and assert plumbing via Tier-3, rather than over-claiming an integration
 test of the `tokio` timeout itself.
-</content>
-</invoke>
+
+## Amendment 1 — `Ctrl-G` demo-mode alias for F1 (2026-06-15)
+
+**Context.** The contextual `hint` overlay (ADR-0053 / H2) is opened with
+**F1**. But F1 reaches the app only as an escape sequence (`\eOP` /
+`\e[11~`), and the `autocast` recorder used for our screencasts **cannot
+emit escape sequences** — so a cast can never trigger F1, and the single
+most teaching-relevant overlay is unreachable in recordings. The same
+wall already bit step-captions (which is why `Ctrl+]`, a single control
+byte, was chosen over `Ctrl+!`).
+
+**Decision.** In **demo mode only**, **`Ctrl-G`** is an alias for F1. It
+runs the exact F1 hint logic (live-input → form hint; empty input →
+recent-error / getting-started) and is **badged as `[F1]`** (not
+`[CTRL-G]`) so a recorded cast is visually identical to a genuine F1
+press. `Ctrl-G` is the only viable choice: it is a single legacy control
+byte autocast can send, whereas `Ctrl`+digit (e.g. the mnemonic `Ctrl-1`)
+is **not encodable in a legacy terminal at all** — digits have no control
+byte, so `Ctrl-1` arrives as a bare `1`; the kitty protocol *would* encode
+it but only as an escape sequence (the very thing autocast can't send),
+and this app deliberately does not enable keyboard-enhancement flags.
+
+**Why demo-gated.** The shipped keymap stays F1-only — a real user never
+trips the alias, and demo mode is also the mode teachers/presenters run,
+so the alias is available exactly where it's wanted. Outside demo mode
+`Ctrl-G` falls through to the inert catch-all (the `Char(c)` insert arm
+excludes CONTROL, so no `g` is typed).
+
+**Scope.** `hint_key` guard in `App::handle_key` gains the demo-gated
+`Ctrl-G` disjunct; `demo_badge_label` maps `Ctrl-G → [F1]` (consulted
+only in demo mode). Test-first: three `app.rs` Tier-1 tests (alias fires
+on input + on empty input; inert when demo off) + the badge-map
+assertion. The keybinding strip (ADR-0051) is **not** changed — F1 stays
+the advertised key; `Ctrl-G` is a recorder aid, and the badge already
+reads `[F1]`.
+
+*(Editorial: this amendment also removed two stray `</content>` /
+`</invoke>` lines accidentally committed at the end of this file.)*

docs/adr/0052-mode-tagged-history-cross-mode-recall.md

@@ -189,9 +189,18 @@ over keeping journaling coupled in the worker (which would have needed the
   no-op-skip / read-only sites no longer journal; success is journalled at
   the dispatch layer (`spawn_dsl_dispatch` / `run_replay` / app-command
   sites). The ring stays `Vec<String>`; `seed_history` / `ProjectSwitched`
-  are untouched. The vestigial worker `source` plumbing (the `_source`
-  param on `finalize_persistence` / `do_rebuild_from_text` and the thin
-  read-only `*_request` wrappers) is left in place — a clean follow-up.
+  are untouched. The vestigial worker `source` plumbing has since been
+  **fully unwound** (2026-06-14 follow-up): `_source` removed from
+  `finalize_persistence` / `do_rebuild_from_text`; the three read-only
+  `*_request` wrappers inlined and deleted; and — because the cascade ran
+  deeper than first estimated — the now-dead `source` param dropped from
+  the ~30 worker handlers (leaf + composite) that only forwarded it, plus
+  the `source` field removed from the `DescribeTable` / `QueryData` /
+  `RunSelect` requests and the matching `DatabaseHandle` method parameters
+  (the ~164 call-site churn was mostly tests). The only `source` left in
+  the worker is the snapshot/undo label (`snapshot_then` /
+  `stage_pre_mutation` / `begin_batch`), passed at the match-arm level.
+  Purely mechanical, compiler-guided, no behaviour change.
 - **App commands recall bare.** Because they are dispatched outside the
   `ExecuteDsl`/spawn path, app commands journal **simple** (`advanced =
   false`) at their own sites, and `submit` excludes them from the ring's

docs/adr/0053-contextual-hint-command-and-keybinding.md

@@ -0,0 +1,428 @@
+# ADR-0053: Contextual `hint` — F1 live-input keybinding + `hint` command, with a tier-3 teaching corpus (H2)
+
+## Status
+
+Accepted — **implemented 2026-06-15** (plan:
+`docs/plans/20260614-adr-0053-contextual-hint-H2.md`; the F1 keybinding +
+`hint` command, the `hint_ids` per-form keying + `hint_key_for_input_in_mode`,
+`last_error_hint_key` + `friendly::error_hint_class`, the `note_hint*`
+renderers, and the `hint.cmd.*`/`hint.err.*` corpus for every command form
++ the 9 runtime error classes, with the comprehensiveness coverage test
+and the ADR-0051 strip advertising F1). Closes **A1** + requirements
+**H2**. Deferred: the pre-submit-diagnostic route + `diagnostic.*` blocks
+(#38), clause-concept hints (#37). Revised after a `/runda` review
+(2026-06-14): corrected the verbosity-default fact; re-keyed tier-3
+content off `help_id`; split the pre-submit-diagnostic and runtime-error
+paths; added a comprehensiveness coverage test. Revised again during
+Phase B implementation (2026-06-15): the first exemplar showed per-*node*
+keying is too coarse for multi-form commands (`add`/`drop`/`show`/
+`create`), so D3 now keys tier-3 content **per form** via a
+`hint_ids: &[&str]` array mirroring `usage_ids` — and **clause-concept
+hints** are recorded as a deferred extension (issue #37). During Phase C
+the **pre-submit-diagnostic route + the ~33 `diagnostic.*` blocks** were
+**deferred** (issue #38) — `Diagnostic` doesn't carry its class key, so
+the route needs a broad change for marginal value (D6). v1 therefore
+ships command-form hints + the 9 runtime error-class hints. The parallel
+question of whether the in-app `help` command should likewise distinguish
+advanced-SQL forms is tracked **separately** as Gitea issue #36.
+
+Decided in conversation 2026-06-14. Closes the last open piece of **A1**
+(the canonical app-command set, ADR-0003): every app command is
+implemented except `hint`, which ADR-0003's command table listed as
+*"Request a hint for the current input (ADR pending)."* This ADR is that
+pending decision. Tracked as **H2** in `docs/requirements.md`.
+
+References ADR-0003 (app-command set + the `:` escape), ADR-0019 (the
+friendly error layer / H1), ADR-0021 (per-command usage templates / H1a),
+ADR-0022 (ambient typing assistance — colour + hint panel + completion),
+ADR-0027 (input validity indicator), ADR-0046 (sidebar navigation +
+responsive input hint), ADR-0049 (input-field readline keymap), and
+ADR-0051 (context/state-aware keybinding strip).
+
+## Context
+
+`hint` is the only unbuilt app command. The naive reading — "show a hint" —
+hides a real subtlety, and a real cost.
+
+**The subtlety: a submitted `hint` command cannot see live input.** App
+commands are submitted with Enter, which empties the input buffer. By the
+time `hint` dispatches, the partial command it was meant to help with is
+gone. So "a hint for the current input" cannot be served by a submitted
+command alone — it needs a *keybinding* that acts on the live buffer
+without submitting. ADR-0003 said "current input"; `requirements.md`
+broadened it to "current input **or the most recent error**." Both are
+wanted; they map to two different trigger surfaces.
+
+**The cost: the value of `hint` is content, not plumbing.** The app
+already carries two tiers of contextual text:
+
+- **Tier 1** — terse, always-on: syntax colour (ADR-0022); the error
+  *headline* alone (ADR-0019, when `messages_verbosity: Short`).
+- **Tier 2** — short contextual lines: the ambient typing prose /
+  `expected` set, shown live while typing (ADR-0022, catalogue
+  `hint.ambient_*` / `hint.value_slot_*`); and the error `hint:` field —
+  which, because `Verbosity::Verbose` is the **default**
+  (`src/friendly/translate.rs:46`), is shown **by default** beneath every
+  error headline (`messages short` is the opt-*out*, not `messages
+  verbose` the opt-in).
+
+So the verbose error hint is **already on screen by default**. If `hint`
+merely re-showed it, it would duplicate what the user can already see (and
+the ambient panel). To justify itself, `hint` must add a **tier 3**: a
+genuinely deeper, *teaching*-grade explanation — what the command/error
+means, a worked example, and the underlying relational concept. That
+corpus does not exist yet, and
+authoring it (to the standard of a teaching tool, where "pedagogy wins
+ties") is the bulk of the work.
+
+The mechanism is small and reuses everything already present: the command
+REGISTRY (`src/dsl/grammar/mod.rs`), the `AppCommand` enum
+(`src/dsl/command.rs`), key dispatch (`App::handle_key`,
+`src/app.rs:1155`), the `note_help`/`note_help_topic` renderers
+(`src/app.rs:2982`/`3021`), the parser/walker expected-set
+(`ParseError.expected`, `WalkResult.tail_expected`), the friendly
+catalogue + `t!` macro + `keys.rs` validation, and the output styling
+vocabulary (`OutputStyleClass::Hint`).
+
+## Decision
+
+### D1 — Two surfaces, no topic argument
+
+`hint` is delivered through **two complementary surfaces**:
+
+1. **F1 keybinding → live input.** Pressing **F1** while typing renders a
+   tier-3 hint for the command currently in the buffer, into the output
+   panel, **without submitting or altering the buffer**. This is the
+   primary, most-valuable path (it serves the literal "current input").
+2. **`hint` command → most recent error.** Submitting `hint` renders the
+   tier-3 expansion of the most recent error. This is why the command
+   exists despite the empty-buffer problem: the thing it helps with is
+   the *last thing you tried*, not the now-empty buffer.
+
+`hint` takes **no topic argument**. Explicit per-command reference is
+already `help <topic>` (H3); `hint` is purely *contextual*, which keeps
+the two cleanly distinct (`hint` = "help me with what I'm doing right
+now"; `help insert` = "show me the insert reference").
+
+F1 is a **read-only overlay**: it never alters the input buffer, the
+cursor, or the live completion memo (ADR-0022) — it only emits a block
+into the output journal. (It must therefore be handled in `handle_key`
+*before* the "any other key clears the memo" fall-through.)
+
+### D2 — Trigger matrix
+
+| Trigger | Buffer / state | Result |
+|---|---|---|
+| **F1** | non-empty input | tier-3 hint for the command being typed. (No "expected next" line — the always-on tier-2 ambient panel already shows it live; tier-2 owns position-awareness.) |
+| **F1** | empty input, a recent error exists | tier-3 expansion of that error |
+| **F1** | empty input, no recent error | a short "getting started" pointer (press F1 while typing a command; `help` for the full list) |
+| **`hint`** (submitted) | a recent error exists | tier-3 expansion of that error (primary use) |
+| **`hint`** (submitted) | no recent error | the same "getting started" pointer |
+
+F1 is inert behind a modal and while a sidebar panel holds navigation
+focus (consistent with the existing `handle_key` gates, ADR-0046); it is
+active in the input context in both Simple and Advanced mode.
+
+**Error routes.** **Runtime errors** (the 9 `translate_error` classes)
+occur *after* submit; the **`hint` command / empty-input F1** path reads
+them via the stored `last_error_hint_key` (D5) and renders their
+`hint.err.<class>` block. (A second route for **pre-submit diagnostics**
+on the F1 live-input path was specified but is **deferred** — D6 / issue
+#38; with a diagnostic present, F1 shows the command block and tier-2
+shows the diagnostic.) **`:`-prefix handling:**
+on the simple-mode one-shot escape (`: SELECT …`), command
+identification for the F1 path strips the leading `:` first, so the
+advanced form is matched.
+
+### D3 — The tier-3 content model
+
+Tier-3 blocks live in the friendly catalogue under the existing `hint:`
+top-level namespace (where tier-2 ambient strings already live), in two
+new sub-namespaces:
+
+- **`hint.cmd.<hint_id>`** — one per command **form**, keyed by a **new
+  `hint_ids: &'static [&'static str]`** field on `CommandNode`
+  (`src/dsl/grammar/mod.rs:512`), **mirroring the existing `usage_ids`**.
+  The F1 live-input path resolves the current input to its form's hint key
+  via `hint_key_for_input_in_mode`, which reuses the same form-word
+  disambiguation as `usage_key_for_input_in_mode`.
+
+  **Why an array mirroring `usage_ids`, not a per-node `hint_id`**
+  *(`/runda`/implementation revision, 2026-06-15)*: a single per-node key
+  is too coarse. Several entry words are **one node spanning many forms** —
+  `add` (column/relationship/index/constraint), `drop` (table/column/
+  relationship/index), `show` (data/table/tables/relationships/indexes),
+  `create` (table/index). A live-input hint for `add 1:n relationship` is
+  only useful if it is *specific to relationships*, so the content must be
+  **per form**, not per node. The project already solved exactly this for
+  usage templates (`usage_ids` is a per-form array, disambiguated by the
+  form word), so `hint_ids` mirrors it. Single-form nodes carry one entry;
+  multi-form nodes carry one per form. This also covers the advanced-SQL
+  forms whose `usage_ids` are empty (`SQL_INSERT/UPDATE/DELETE`,
+  `EXPLAIN_SQL`) — they get their own `hint_ids` directly, independent of
+  usage, with mode-correct SQL examples. (The `help`-list collapse of
+  advanced-SQL forms is a separate gap — issue #36.)
+
+  **Deferred extension — clause-concept hints** (issue #37): per-form is
+  the right granularity for tier-3 *teaching* (position-awareness within a
+  form is owned by tier-2 ambient + the live `Next:` line, D4). But some
+  **concepts live inside a clause**, not a form — `… on delete ⟨cascade|
+  set null|restrict⟩` (referential actions), the `create table` constraint
+  slots (`primary`/`unique`/`check`/`foreign`), `with pk`, `1:n`/`m:n`
+  cardinality. A learner parked in such a clause may want teaching deeper
+  than tier-2's candidate list but narrower than the whole-form block. v1
+  does **not** build this (it would multiply content for points whose value
+  we can't yet measure, and we don't expect to accumulate usage statistics
+  to drive it empirically — it will be tackled as a deliberate follow-up
+  job). The keying does not lock it out: a later `hint.concept.<topic>`
+  namespace can be surfaced when the cursor sits in a recognized clause,
+  layered on top of the per-form block.
+- **`hint.err.<class>`** — one per error/diagnostic class, keyed by the
+  friendly error/diagnostic key (e.g. `hint.err.foreign_key.child_side`,
+  `hint.err.type_mismatch`, `hint.err.insert_arity_mismatch`). Used by
+  both error routes (D2).
+
+Each tier-3 block is a **structured entry with three labelled parts**, so
+the voice stays consistent and the renderer can style them uniformly:
+
+```yaml
+hint.cmd.dsl.insert:
+  what: "Add one or more rows to a table."
+  example: "insert into Customers values ('Ann', 'ann@x.io')"
+  concept: "A row is one record; each value lines up with a column, in
+    order. Columns typed `serial`/`shortid` fill themselves — leave them out."
+```
+
+- **`what`** — one or two plain sentences: what this command does / what
+  this error means.
+- **`example`** — a single concrete, copyable line (rendered neutral, not
+  muted, so it stands out as runnable).
+- **`concept`** — the underlying relational idea, in teaching voice; the
+  part that makes this tier-3 rather than tier-2.
+
+`concept` is optional where there is genuinely no concept beyond the
+mechanics (e.g. `quit`); `what` + `example` are always present.
+
+### D4 — Rendering
+
+Both surfaces render through the `App::note_hint*` family (sibling of
+`note_help`/`note_help_topic`, `src/app.rs`) via `emit_tier3_block`,
+emitting into the `output` buffer as `OutputKind::System`: a **`Hint`
+heading** followed by aligned **`What:` / `Example:` / `Concept:`** lines
+(labels + heading from `hint.block.*`). The `concept` line is muted
+(`OutputStyleClass::Hint`); the rest are plain. The block is
+**persistent** (scrolls in the journal), unlike the transient ambient
+panel — pressing F1 is an explicit request to *keep* the deeper guidance
+on screen. Its rendered shape is locked by an `insta` snapshot
+(`hint_block_insert`). The bottom keybinding strip (ADR-0051) advertises
+F1 in the editing (leading) and default states.
+
+### D5 — "Most recent (runtime) error" state
+
+The **runtime-error route** (submitted `hint`, and empty-input F1) needs
+to map the last runtime error back to its `hint.err.<class>` key. Runtime
+errors today live only as rendered text in the `output` buffer. We add a
+single small piece of `App` state — **`last_error_hint_key:
+Option<String>`** — set at the `translate_error` call sites
+(`runtime.rs:2615`, `app.rs:2424`) when a friendly error is rendered,
+cleared when a later command succeeds. Absent → the "getting started"
+pointer.
+
+The **pre-submit-diagnostic route** (the F1 live-input path reading the
+under-cursor diagnostic) is **deferred** — see the scope note in D6.
+
+### D6 — Content scope for v1
+
+v1 ships tier-3 content for the **command forms and runtime error
+classes** — comprehensive for those (the graceful tier-2 fallback below
+is a safety net, not the plan):
+
+- **~37 command forms** — every distinct node in `REGISTRY` gets its own
+  `hint.cmd.<hint_id>` block (app + DSL + DDL + advanced-mode SQL forms),
+  each with a **mode-correct example** (the advanced-SQL forms show SQL
+  syntax, their simple siblings show DSL — no sharing).
+- **9 runtime error classes** — `unique`, `foreign_key` (child/parent
+  side), `not_null`, `check`, `type_mismatch`, `not_found`,
+  `already_exists`, `generic`, `invalid_value` — each gets a
+  `hint.err.*` block.
+
+**Deferred — the ~33 `diagnostic.*` pre-submit classes and the F1
+diagnostic route** *(Phase C scope decision, 2026-06-15; issue #38)*. The
+original "comprehensive" scope included them, but implementation revealed
+`Diagnostic` (`walker/outcome.rs`) carries only its rendered `message`,
+not its class key — so a live diagnostic can't be mapped to
+`hint.err.<class>` without adding a `class` field threaded through every
+diagnostic-creation site (a broad change). Weighed against the value, it
+isn't worth it for v1: pre-submit diagnostics are already surfaced by
+tier-2 (ambient message + validity indicator, ADR-0027); F1 still shows
+the useful command block when a diagnostic is present; and many
+diagnostic classes duplicate runtime classes already covered
+(`type_mismatch`, `unknown_table`↔`not_found`, arity↔`invalid_value`).
+Deferred to issue #38, additively (the keying doesn't lock it out).
+
+The full enumerated checklist is the implementation plan's tracking
+artifact (see *Content inventory*, below).
+
+**Fallback (safety net):** if a tier-3 key is ever missing at runtime,
+the surface degrades to tier 2 — the ambient prose for the command path,
+or the verbose error `hint:` for the error path — never to a blank or an
+error. The `keys.rs` build-time validation keeps the corpus honest, so a
+missing key is caught in tests, not in front of a student.
+
+### D7 — Authoring process: exemplars-first
+
+Because the corpus is large and its *voice* is a pedagogical decision the
+maintainer owns, content is produced in two stages:
+
+1. This ADR carries **2–3 worked exemplars** (below) as the canonical
+   style reference. The `/runda` review of this ADR is where the voice and
+   depth are approved.
+2. Once approved, the remaining blocks are authored to that template in
+   **reviewable batches** (grouped by area: DDL, DML, app commands,
+   error classes), not one monolithic drop.
+
+### Exemplars (the style reference; shipped as the rendered format)
+
+**Command (F1 live-input), `insert`** (the rendered shape, locked by the
+`hint_block_insert` snapshot — a `Hint` heading + aligned labels, no
+`Next:` line since tier-2 owns position-awareness):
+
+```
+Hint
+  What:    Add one or more rows to a table.
+  Example: insert into Customers values ('Ann', 'ann@example.io')
+  Concept: A row is one record; each value lines up with a column, in
+           order. Columns typed serial/shortid fill themselves — leave
+           them out.
+```
+
+**Error (`hint` command), foreign-key child-side violation:**
+
+```
+Hint
+  What:    The value you gave for the child column doesn't match any
+           parent row, so the foreign key has nothing to point at.
+  Example: First insert the parent (insert into Customers …), then the
+           child that references it.
+  Concept: A foreign key is a promise that every child points at a real
+           parent, so the parent must exist first. To allow orphans on
+           delete instead, set the relationship's `on delete` to
+           `set null` or `cascade`.
+```
+
+**Command (F1 live-input), `add 1:n relationship`:**
+
+```
+Hint
+  What:    Link two tables so a parent row can own many child rows.
+  Example: add 1:n relationship from Customers.id to Orders.customer_id
+  Concept: The "1:n" means one parent, many children. The child column
+           holds the foreign key; `--create-fk` adds it for you if it
+           doesn't exist yet.
+```
+
+## Forks (all user-chosen, 2026-06-14)
+
+- **Trigger model:** both a keybinding (live input) and a submitted
+  command (last error), rather than command-only or keybinding-only — the
+  live-input path is the most useful, but the command completes the A1
+  slot and serves the error case.
+- **Keybinding = F1:** the universal help convention; the key is
+  genuinely free (no `KeyCode::F(1)` binding exists today — the `"F1"`
+  strings in `input_render.rs`/tests are scenario labels, not the key, and
+  ADR-0022 uses no `F1` requirement label). No collision with the ADR-0049
+  readline keys, `Ctrl-O` (ADR-0046), `Esc`-clear, or the reserved
+  `Ctrl-C` cancel (I5). Rejected: `?` (a typeable character — fiddly
+  position-dependent handling) and a Ctrl/Alt chord (less discoverable, no
+  advantage).
+- **No topic argument:** contextual only; `help <topic>` already owns
+  explicit reference lookup.
+- **Comprehensive content for v1:** the full inventory, not a starter
+  subset.
+- **Exemplars-first authoring:** lock the voice on a few blocks, then
+  mass-author to template.
+
+## Consequences
+
+- **A1 closes.** With `hint` registered and built, all 15 canonical
+  app-level commands exist in both modes.
+- **A third contextual tier exists.** Students get on-demand, teaching-
+  grade guidance that is deeper than the always-on colour, the headline,
+  the ambient one-liner, and the verbose error hint — without cluttering
+  those terse defaults.
+- **One new keybinding (F1)** joins the keymap and the ADR-0051 strip.
+- **A new `hint_ids: &[&str]` field on `CommandNode`** (mirroring
+  `usage_ids`) + a `hint_key_for_input_in_mode` lookup (reusing the
+  `usage_key_for_input_in_mode` form-disambiguation), one new field of
+  `App` state (`last_error_hint_key`), and one new renderer family
+  (`note_hint*`); the `AppCommand` enum gains `Hint`, the grammar a `HINT`
+  node, the REGISTRY one entry.
+- **A durable content corpus** (~37 command blocks + 10 runtime
+  error-class blocks) enters the catalogue under `hint.cmd.*` /
+  `hint.err.*`, validated by `keys.rs`. This is ongoing surface area: new
+  commands/error classes should ship with their tier-3 hint (a checklist
+  item for future feature ADRs). (Diagnostic-class blocks deferred — #38.)
+- **Testing:** Tier-1 unit tests for the trigger matrix (F1 with
+  empty/non-empty input; `hint` with/without a recent error;
+  `last_error_hint_key` set on the `translate_error` sites and cleared on
+  success; the mode-aware form resolution; the `:` strip), the
+  command-identification logic, and the tier-2 fallback; Tier-2 `insta`
+  snapshots for a representative rendered hint block; Tier-3 integration
+  tests for the end-to-end flows (type a partial command → F1 → block
+  appears, **buffer and completion memo untouched**; run a failing
+  command → `hint` → error expansion). **A comprehensiveness coverage
+  test** (enforces D6): iterate the REGISTRY and assert every node with a
+  `hint_ids` entry resolves to a `hint.cmd.*` block, and every runtime
+  error class resolves to a `hint.err.*` block — `keys.rs` only checks
+  that *referenced* keys resolve, not that every command/error *has* one,
+  so this test is what makes the scope enforceable rather than
+  aspirational. (Diagnostic classes are out of this scope — D6 / #38.)
+
+## Out of scope
+
+- **Per-topic `hint <topic>`** — OOS (rejected): `help <topic>` already
+  serves explicit lookup; a topic arg would overlap it and double the
+  content-authoring surface.
+- **Re-showing tier-3 inline as the always-on ambient hint** — OOS
+  (rejected): the ambient panel stays terse by design (ADR-0022); tier-3
+  is on-demand. Promoting it would defeat the tiering.
+- **Localised tier-3 content beyond `en-US`** — OOS (deferred): the
+  catalogue is structured for i18n (ADR-0019), but additional locales
+  follow the project's English-only-for-v1 stance (requirements X2).
+- **`hint` for a *successful* command's deeper teaching** (e.g. "you just
+  created a table — here's what an index would add") — OOS (deferred): a
+  plausible future tier-3 use, but v1 scopes the command path to errors
+  and the F1 path to in-progress input.
+- **Clause-concept hints** (`… on delete ⟨action⟩`, constraint slots,
+  `with pk`, cardinality) — OOS (deferred, issue #37): a
+  `hint.concept.<topic>` layer surfaced when the cursor sits in a
+  recognized clause, deeper than tier-2's candidate list but narrower than
+  the per-form block. Per-form keying (D3) does not lock it out. To be
+  tackled as a deliberate follow-up job, not gated on usage statistics.
+- **Pre-submit-diagnostic route + `diagnostic.*` tier-3 blocks** — OOS
+  (deferred, issue #38): needs a class field on `Diagnostic` threaded
+  through every creation site (broad change) for marginal value, since
+  tier-2 already surfaces diagnostics and many duplicate runtime classes
+  (D6).
+
+## Content inventory (implementation tracking)
+
+The implementation plan enumerates and checks off every block:
+
+- **`hint.cmd.<hint_id>`** — one per distinct `REGISTRY` node (~37), each
+  with its own `hint_id` and a mode-correct example: app (`save`, `save
+  as`, `load`, `new`, `rebuild`, `export`, `import`, `replay`, `undo`,
+  `redo`, `mode`, `messages`, `copy`, `help`, `hint`, `quit`); DDL
+  (`create table`, `create m:n`, `add column`/`relationship`/`index`,
+  `drop`, `rename`, `change column`); DML (`insert`, `update`, `delete`,
+  `show`, `seed`, `explain`, `select`/`with`). The **7 advanced-mode SQL
+  forms** (`SQL CREATE TABLE`, `ALTER TABLE`, `CREATE/DROP INDEX`, `DROP
+  TABLE`, `SQL INSERT/UPDATE/DELETE`, `EXPLAIN SQL`, raw `SELECT`/`WITH`)
+  each get their **own** block with SQL syntax — they do **not** reuse
+  their simple sibling's (this is the `/runda` correction; the parallel
+  `help`-side gap is issue #36).
+- **`hint.err.*`** — one per runtime error class (`unique`,
+  `foreign_key.{child,parent}_side`, `not_null`, `check`,
+  `type_mismatch`, `not_found`, `already_exists`, `generic`,
+  `invalid_value`). The `diagnostic.*` pre-submit classes are **deferred**
+  (D6 / issue #38).

docs/adr/0054-release-versioning-and-version-surfaces.md

@@ -0,0 +1,73 @@
+# ADR-0054: Release versioning policy + version surfaces (`--version` / `version`)
+
+## Status
+
+Accepted — **implemented 2026-06-16** (plan:
+`docs/plans/20260616-public-availability.md`, step 1). First step on the
+road to public availability. Adds a `--version` / `-V` CLI flag and an
+in-app `version` command, both reporting `CARGO_PKG_VERSION`, plus a
+release-CI guard that the `v*` tag equals that version. No prior issue or
+`requirements.md` item existed for this — it was an untracked gap.
+
+## Context
+
+Before this, `Cargo.toml` carried `version = "0.1.0"`, the binary exposed
+**no** way to report its version, and `release.yaml` named assets from the
+**git tag** (`rdbms-playground-<tag>-<target>`) while building from
+`Cargo.toml`. Tag and crate version were **decoupled**: tagging `v0.2.0`
+would publish an asset named `…-v0.2.0-…` containing a binary that (had it
+been able to say) reported `0.1.0`. On the way to public availability —
+where users download a versioned artifact and file bug reports against "the
+version I'm running" — that drift is a correctness problem.
+
+## Decision
+
+1. **`Cargo.toml` `version` is the single source of truth.** This is the
+   idiomatic Rust position and avoids making `Cargo.toml` lie. The version
+   is read at compile time via `env!("CARGO_PKG_VERSION")`; no build-time
+   injection of the tag into the crate.
+
+2. **Two user-facing surfaces, one source:**
+   - **`--version` / `-V`** — CLI flag (hand-rolled parser, mirrors
+     `--help`): prints and exits before any other work (`main.rs`).
+   - **`version`** — an in-app app command (REGISTRY node `app::VERSION`,
+     `AppCommand::Version`), emitting the same line into the output panel.
+   Both go through `cli::version_text()` → the catalog key
+   `cli.version_line` (`"rdbms-playground {version}"`), so there is exactly
+   one rendered string and one version source.
+
+3. **Release-CI discipline.** `release.yaml`'s pre-build `test` job gains a
+   **version guard**: it reads the `[package]` version directly from
+   `Cargo.toml` (`grep -m1 '^version = '` — toolchain-free; an earlier
+   `cargo metadata | node` form broke on the flake devShell's stdout banner)
+   and **fails the release** unless the pushed tag equals `v<that version>`.
+   So `--version`, the release name, and the downloaded asset are always in
+   lockstep — enforced by the machine, not by memory.
+
+4. **The release ritual:** bump `Cargo.toml` → commit → tag `v<that
+   number>` → push the tag. The guard rejects any deviation.
+
+### Rejected / deferred
+- **Inject the tag into the build** (tag as source of truth): fiddly with
+  cargo and makes `Cargo.toml` a placeholder/lie. Rejected.
+- **Git-hash + build-date enrichment** (a `build.rs` so dev builds read
+  `0.2.0 (a1b2c3d)`): useful for bug reports, but not needed for the
+  tag↔release↔`--version` consistency this ADR is about. Deferred; can be
+  added behind the same `version_text()` seam without changing the policy.
+- **UI placement beyond the `version` command** (status-bar string, etc.):
+  the command + `help` listing is enough for now (user decision).
+
+## Consequences
+
+- A release can no longer ship a binary whose self-reported version
+  disagrees with its tag/filename.
+- Cutting a release now *requires* a `Cargo.toml` bump commit — a small,
+  deliberate step (and a natural place to update a changelog later).
+- New keys: `cli.version_line` (+ `help.app.version`, `parse.usage.version`,
+  `hint.cmd.version.what`/`.example`); a new REGISTRY command means the
+  comprehensiveness coverage test now also requires `hint.cmd.version`,
+  which is supplied. Tested: CLI flag parse (`--version`/`-V`/default-off),
+  `version_text()` carries `CARGO_PKG_VERSION`, the in-app command parses to
+  `AppCommand::Version` and emits the version.
+- This is step 1 of `docs/plans/20260616-public-availability.md`; the
+  installer (`install.sh`) and package-manager work (D3) build on top.

docs/adr/0055-curl-sh-install-script.md

@@ -0,0 +1,86 @@
+# ADR-0055: `curl | sh` install script (`scripts/install.sh`)
+
+## Status
+
+Accepted — **implemented 2026-06-17** (plan:
+`docs/plans/20260616-public-availability.md`, step 2). Step 2 on the road
+to public availability, building on ADR-0054 (versioned releases) and
+ADR-ci-001/003 (the Gitea releases it downloads from). Tracked by the
+plan + this ADR (no Gitea issue — user decision, 2026-06-17).
+
+## Context
+
+Until now, installing meant: find the releases page, work out which of
+the six assets matches your machine, download it, `chmod +x`, move it
+onto `PATH`, and (on macOS) wonder about Gatekeeper. That is too much
+friction for a teaching tool aimed at beginners. The Gitea releases are
+**publicly downloadable** (confirmed), with deterministic asset names
+(`rdbms-playground-<tag>-<target>[.exe]`) and `.sha256` sidecars
+(ADR-ci-003), and a `releases/latest` API — enough to script a one-liner
+install.
+
+## Decision
+
+Ship **`scripts/install.sh`**, run as
+`curl -fsSL <gitea-raw>/scripts/install.sh | sh`:
+
+- **POSIX `sh`** (no bashisms) — it runs under the `sh` of `curl | sh`;
+  kept **shellcheck-clean** (`-s sh`).
+- **Platform detection** from `uname` → target triple: Linux →
+  `<arch>-unknown-linux-musl` (the fully-static build — one universal
+  Linux artifact, no glibc/version coupling), macOS → `<arch>-apple-darwin`;
+  `x86_64`/`amd64` and `aarch64`/`arm64` both map. **Windows is rejected**
+  with a pointer to Scoop/winget/the releases page (the binary is a `.exe`,
+  not a `curl|sh` target).
+- **Version:** the `releases/latest` API tag by default; `RDBMS_VERSION`
+  pins a specific tag.
+- **Integrity:** always download the `.sha256` sidecar and **verify**
+  (`sha256sum`/`shasum -a 256`); a mismatch aborts the install. HTTPS only.
+- **Install location:** `~/.local/bin` by default (user-writable, no
+  sudo), overridable via `RDBMS_INSTALL_DIR`; prints a PATH hint if the
+  dir isn't on `PATH`.
+- **macOS note:** a `curl` download is **not** Gatekeeper-quarantined, so
+  the binary runs as-is even while it is only ad-hoc-signed; proper
+  Developer-ID signing + notarization (for *browser* downloads) is a
+  separate, postponed task (see the plan's signing item).
+- **Testing seams:** `RDBMS_OS`/`RDBMS_ARCH` force detection and
+  `--print-target` prints the resolved triple and exits — so the mapping
+  is checkable without a download.
+
+### Rejected / deferred
+- **Hosting the script on the website domain** (Cloudflare): nicer URL,
+  but adds a moving part; the **Gitea repo raw URL** is simplest and the
+  binaries live there anyway (user decision). The website may later
+  *reference* the same command.
+- **Uploading `install.sh` as a release asset** for a stable link:
+  optional; the branch raw URL is fine for now.
+
+## Amendment 1 — `install.ps1` (Windows) added (2026-06-17)
+
+Windows was originally deferred to Scoop/winget; the user opted for **both**
+a PowerShell one-liner now *and* package managers later. Added
+**`scripts/install.ps1`** (`irm <url> | iex`): maps the host CPU to our
+`*-windows-gnu`/`-gnullvm` `.exe`, resolves the latest release (or
+`-Version`/`RDBMS_VERSION`), downloads + **SHA-256-verifies**, installs to
+`%LOCALAPPDATA%\Programs\rdbms-playground` (`-InstallDir`/`RDBMS_INSTALL_DIR`
+override), and adds that dir to the **user PATH**. **Caveat:** unlike
+`install.sh` (verified end-to-end), this was **written but not tested from
+this environment** (no PowerShell available) — validate on a real Windows
+host. Scoop/winget (D3) remain the idiomatic package-manager routes.
+
+## Consequences
+
+- A first-time user runs one line and gets a checksum-verified binary on
+  `PATH`. The website's install copy (website branch, separate agent) can
+  point at this command.
+- **Verified end-to-end** (2026-06-17) against the live public `v0.1.0`:
+  all four Linux/macOS platform mappings + Windows/unknown-arch rejection;
+  pinned and latest paths; checksum verification incl. a tamper-rejection
+  check; install + run on Linux x86_64. (The installed `v0.1.0` predates
+  `--version`, ADR-0054 — a non-issue, and the reason to cut a new
+  release.)
+- **No automated regression guard in CI yet:** shellcheck isn't in the
+  flake, and there's no shell-test harness here (no bats). Recommended
+  follow-up: add a `shellcheck scripts/*.sh` gate (touches ADR-ci-002 —
+  needs shellcheck in the devShell). For now the guard is local
+  shellcheck + the documented end-to-end verification.

docs/adr/0056-crates-io-and-cargo-binstall.md

@@ -0,0 +1,112 @@
+# ADR-0056: crates.io publish-readiness + `cargo binstall` metadata (D3)
+
+## Status
+
+Accepted — **prepared 2026-06-17** (plan:
+`docs/plans/20260616-public-availability.md`, step 3a). The crate is made
+**ready to publish** and carries `cargo-binstall` metadata. The actual
+`cargo publish` is a gated maintainer step (see Ordering). First D3
+package-manager mechanism; builds on ADR-0054 (versioned releases),
+ADR-0055 (installer), ADR-ci-003 (release assets). Tracked by plan + ADR
+(no Gitea issue — user decision).
+
+## Context
+
+`cargo binstall rdbms-playground` (and `cargo install`) need the crate on
+**crates.io** (user decision, 2026-06-17). The manifest had
+`publish = false`, a `readme = "README.md"` pointing at a **missing**
+file, and no `keywords`/`categories`. Our release assets are **bare
+binaries** (not archives) named `rdbms-playground-v<version>-<target>`
+(`.exe` on Windows) with `.sha256` sidecars (ADR-ci-003); critically the
+**release target triples differ from users' host triples** — we ship the
+static `*-linux-musl` build (hosts are `*-linux-gnu`) and
+`*-windows-gnu`/`-gnullvm` (hosts are `*-msvc`); only macOS matches.
+
+## Decision
+
+**Publish-readiness (this change):**
+- Drop `publish = false`; add `homepage = "https://relplay.org"`,
+  `keywords`, `categories = ["command-line-utilities", "database"]`, and
+  an `exclude` (`/website`, `/docs`, `/.gitea`, `/.codegraph`) so the
+  published crate is code-only (585 files/8.3 MiB → 353/913 KiB
+  compressed).
+- Author **`README.md`** (the `readme` target + crates.io front page;
+  engine-neutral and "simple/advanced mode" wording per ADR-0002 / the
+  website copy rules), with install instructions (curl|sh, binstall,
+  source, prebuilt).
+- Add **`LICENSE-MIT`** and **`LICENSE-APACHE`** (the latter the verbatim
+  canonical text, added by the maintainer; both © Lazy Evaluation Ltd —
+  the publication entity), and a **`CONTRIBUTING.md`** stating the
+  "inbound = outbound" dual-license arrangement (so Apache-2.0 §5 makes
+  the §3 patent grant explicit on the self-hosted forge). Dual license
+  kept (not MIT-only) — user decision after reviewing the patent-grant
+  rationale.
+
+**`cargo binstall` metadata** (`[package.metadata.binstall]`, syntax
+verified against cargo-binstall SUPPORT.md):
+- `pkg-fmt = "bin"` (bare binary), `bin-dir = "{ bin }{ binary-ext }"`,
+  and a base `pkg-url` using `v{ version }` (the `{ version }` placeholder
+  excludes the leading `v`).
+- **Per-target `overrides`** mapping the common host triples to the asset
+  we actually publish: `x86_64`/`aarch64-unknown-linux-gnu` → the `-musl`
+  asset; `x86_64`/`aarch64-pc-windows-msvc` → the `-gnu`/`-gnullvm`
+  `.exe`. macOS needs no override (host triple == asset triple). The docs
+  do **not** promise automatic musl/gnu or msvc/gnu fallback, hence
+  explicit overrides.
+
+**Ordering / gating (important):**
+- `cargo publish` is **irreversible** (needs the crates.io token; a
+  version can't be un-published, only yanked) — a deliberate **maintainer
+  step**, not done here.
+- binstall's `pkg-url` resolves to a **tagged release's** assets, so
+  publish **at a new tagged version whose release already exists**, and
+  publish **after** that release is built. **Do not publish `0.1.0`** — it
+  would diverge from the already-released `0.1.0` binaries (which predate
+  `--version`, ADR-0054). The clean path: bump → tag → release builds →
+  `cargo publish`.
+
+## Verification
+
+- `cargo publish --dry-run --allow-dirty` packages + verify-builds cleanly
+  (353 files, 913 KiB compressed; no metadata errors).
+- `cargo metadata` confirms the `binstall` block + all four `overrides`
+  parse.
+- **Unverified:** an actual `cargo binstall` run — cargo-binstall isn't a
+  dependency and nothing is on crates.io yet. **Validate at the first
+  publish + matching release** (especially the windows-msvc→gnu and
+  linux-gnu→musl overrides).
+
+## Consequences
+
+- The crate can be published at the next tagged release with `cargo
+  publish` (+ the token); `cargo install rdbms-playground` and `cargo
+  binstall rdbms-playground` then work.
+- Remaining D3: Scoop, Homebrew (`lazyeval` tap), winget (komac/manual) —
+  each a manifest + a per-release bump, tracked in the plan.
+- Remaining follow-up: run the real `cargo binstall` validation at the
+  first publish + matching release (the license files, © holder, and
+  CONTRIBUTING are now in place).
+
+## Amendment 1 — 2026-06-18: published live + a manual `publish` workflow
+
+**`rdbms-playground 0.2.0` is published to crates.io** (`cargo install` and
+`cargo binstall rdbms-playground` both verified working by the user). The
+"unverified binstall" caveat is resolved — the per-target overrides
+resolve correctly against the `v0.2.0` release assets.
+
+**How publishing is wired:** a new **manual `workflow_dispatch` workflow**
+(`.gitea/workflows/publish.yaml`), mirroring `release-macos.yaml`, takes a
+`tag` input and runs `cargo publish` (token via the
+`CARGO_REGISTRY_TOKEN` Gitea Actions secret — a crate-scoped,
+publish-update token). **Not** automated on the tag, by decision: the
+publish is irreversible (yank-only), keeping the registry token off every
+tag push; the release is split (Linux/Windows on the tag, macOS
+dispatched), so a human is the natural "all assets are up — go" gate; and
+crates.io has no Gitea-Actions trusted-publishing path today, so a stored
+token on the self-hosted runner would be the only automated option.
+Each registry is its **own idempotent job** (no inter-job `needs`) — the
+crates.io job skips cleanly if the version is already published (crates.io
+API pre-check + `cargo publish` as the backstop) — so future
+Scoop/Homebrew/winget jobs can be added alongside without breaking one
+another or re-runs. The first such job's `tag`-vs-`Cargo.toml` guard
+mirrors `release.yaml`.

docs/ci/adr/20260612-adr-ci-001.md

@@ -0,0 +1,195 @@
+# ADR-ci-001: CI + release pipeline on Gitea Actions
+
+## Status
+
+**Accepted (2026-06-12); implemented the same day on the `ci` branch.** Every
+fork below was settled with the user as the pipeline was built, and each stage
+was verified live before acceptance:
+
+- a throwaway probe workflow established how the runner executes jobs;
+- the CI image was built and checked locally (runner contract, warm devShell);
+- the gate ran green (**clippy clean; 2424 tests pass / 0 fail / 1 intentional
+  ignored doctest**);
+- the release was exercised end-to-end — tag `v0.0.0-citest2` published a Gitea
+  release carrying the static binary (~10 MB) and its `.sha256`.
+
+This ADR records the **CI/release pipeline**. The **dev/build environment it
+runs on** — the nix flake (devShell + reproducible build, pinned Rust 1.95.0)
+— is **ADR-ci-002** (relocated here from main's ADR-0049); this ADR builds on
+it rather than restating it.
+
+> **Namespacing.** Kept in `docs/ci/adr/` (id `ADR-ci-001`), disjoint from
+> `main`'s integer ADR sequence, mirroring the website subproject's
+> `docs/website/adr/`. This avoids the cross-branch number collisions that
+> previously forced website ADRs to be renumbered (see that namespace's
+> history note and ADR-0000 "Numbering discipline").
+
+## Amendment — 2026-06-13: D1 matrix (non-macOS)
+
+§3 (Release) below describes the original **single-target** (x86_64 Linux) job.
+The release is now a **`test` → `build` matrix** over the four non-macOS D1
+targets (Linux + Windows × x86_64/aarch64), cross-built with `cargo-zigbuild`.
+The full decision — tooling, targets, the Windows `synchronization` stub, the
+matrix shape, and the macOS deferral with its licensing rationale — is recorded
+in its own record: **[ADR-ci-003](20260613-adr-ci-003.md)**.
+
+## Context
+
+The project is near feature-complete and needs CI (`requirements.md` **TT5**;
+the **CI** item in the deferred list) and a release path for its distributed
+binaries (**D1**/**D2**/**D3**). The self-hosted Gitea instance
+(`git.lazyeval.net`) has its Actions runner freshly set up — a first-time
+in-anger use — with a DinD-capable setup and a reusable `docker-build`
+template, exercised by a handful of sample workflows.
+
+The starting constraints, and what the probe found:
+
+- The runner label is **`ci-public`**. A throwaway probe
+  (`ci-probe.yaml`, since removed) established that **jobs run *inside* a
+  container** — `ghcr.io/catthehacker/ubuntu:act-22.04` by default, as **root**
+  — and therefore the runner *host's* nix is **not** on the steps' PATH
+  (`nix NOT on PATH`, `no /nix`). A custom job `container:` *can* be pulled
+  (it pulled `nixos/nix:latest`), but the runner keeps job containers alive
+  with `entrypoint: /bin/sleep` and runs JS actions (e.g. `actions/checkout`)
+  with `node`, so the container must provide **`sleep` + `bash` + `node`** —
+  a bare `nixos/nix` image has none and fails to start.
+- The reusable template only does `docker build`; it neither runs a Rust gate
+  nor pushes images nor uploads release assets — so a Rust pipeline can't just
+  call it.
+- The whole motivation (per the user) is for CI to use the project's **nix
+  flake** for its tools rather than relying on whatever the build machine has
+  — i.e. **one toolchain definition shared by dev and CI**.
+
+## Decision
+
+### 1. Toolchain delivery — a baked nix CI image
+
+CI gets its toolchain from a **purpose-built job-container image**, not from
+host nix and not by installing nix per-job:
+
+- **Base `node:22-bookworm-slim`.** Debian slim already provides `bash` +
+  coreutils (`sleep`); the `node` tag adds the actions runtime. This satisfies
+  the act_runner job-container contract at a fraction of the size of the
+  catthehacker runner images (chosen on the user's prompt to avoid those
+  multi-GB images), and far more reliably than a bare `nixos/nix` (which can't
+  start). `.gitea/ci-image/Dockerfile`.
+- **Single-user nix on top**, flakes enabled, with the **flake's devShell
+  pre-warmed** (`nix develop` realizes nixpkgs + the pinned Rust toolchain +
+  `cargo-sweep` + the musl cc into the store). CI then runs `nix develop -c …`
+  against a warm store — the *same* pinned toolchain as dev (ADR-ci-002),
+  reaching a ready toolchain in ~1.4 s.
+- **Built + pushed by `build-ci-image.yaml`** via the DinD service to the
+  Gitea container registry as `git.lazyeval.net/<owner>/rdbms-playground-ci`,
+  a **public** package (anonymous pull, no gate-side credentials). It runs only
+  when an image input changes (Dockerfile / `flake.nix` / `flake.lock` /
+  `rust-toolchain.toml`) or on manual dispatch.
+
+### 2. Gate — `ci.yaml`
+
+On branch pushes and PRs, a single job runs **inside the CI image**:
+`nix develop -c cargo clippy --all-targets -- -D warnings` then
+`nix develop -c cargo test --no-fail-fast`.
+
+**`fmt` is deliberately not gated.** The tree isn't clean under stock
+`rustfmt` (~100 files would change; no `rustfmt.toml` is committed) and
+reformatting would churn blame across the in-flight website branch and ongoing
+`main` work — so, by user decision, the gate is **clippy + test** and fmt is
+revisited on `main` (also recorded in ADR-ci-002).
+
+### 3. Release — `release.yaml`
+
+On a `v*` tag, one job in the CI image:
+
+1. **tests** (`cargo test`) — so a tag can never publish untested code, even
+   one pointing at a never-gated commit (user choice over relying solely on the
+   branch gate);
+2. **builds the static binary** for **`x86_64-unknown-linux-musl`** (D2:
+   single static binary, no runtime deps). The glibc/nix-store build is
+   non-portable; the musl target with `crt-static` is fully static. rusqlite's
+   `bundled` SQLite C is compiled by a **musl `cc`** (`pkgsCross.musl64`) wired
+   into the flake devShell via `CC_<target>` + `CARGO_TARGET_<TARGET>_LINKER`;
+   `[profile.release] strip = "symbols"` trims it (~13 MB → ~10 MB);
+3. **publishes** the binary + a `.sha256` to a Gitea release via the API and
+   the auto-provided **`GITEA_TOKEN`** — no third-party action (just `curl` +
+   `node`, both in the image).
+
+### 4. Triggers — branch vs tag hygiene
+
+- Gate and image-build are scoped to **branch** pushes (`branches: ['**']`).
+  Tag pushes ignore `paths:` filters and would otherwise spuriously rebuild the
+  unchanged image and re-gate an already-gated commit; the branch filter
+  excludes tags. **`release.yaml` owns tags** (`tags: ['v*']`).
+- Pushing commits + a tag together still gates the commits (via the branch
+  ref) and releases (via the tag ref) — no lost coverage, no duplicate runs.
+
+### 5. Auth
+
+- **Image push:** a dedicated PAT with `write:package`, supplied as the
+  `REGISTRY_USERNAME` / `REGISTRY_TOKEN` Actions secrets (the package owner
+  must match the token's user — an `oli`-namespace push with a different user
+  is refused with `reqPackageAccess`).
+- **Release publish:** the auto `GITEA_TOKEN` (repo/release scope).
+
+### 6. Scope this iteration — Linux x86_64, step by step
+
+The user's target is the full **D1** matrix, approached incrementally. This
+iteration ships **Linux x86_64 only**; the rest is deferred (below).
+
+## Consequences
+
+- **One toolchain, dev and CI.** They build through the same flake and cannot
+  drift. New image rebuilds only when the flake/toolchain/Dockerfile change.
+- **D2 is met on Linux.** The release artifact is a genuinely static,
+  stripped musl binary that runs with no runtime dependencies.
+- **DinD is per-job (no layer cache across runs),** so every `build-ci-image`
+  run rebuilds from scratch (~6 min). Acceptable at its trigger frequency;
+  base-pull caching via the `dind-cached` proxy variant is a possible later
+  optimisation.
+- **The CI image is ~5.5 GB+** (the Rust toolchain closure, now also musl).
+  Pulled once per runner and cached; slimming (multi-stage, prune) is optional.
+- **Every gate run recompiles the full dependency graph** (warm *toolchain*,
+  cold *deps*; clippy and test don't share artifacts), ~2 min total. Fine for
+  now; dependency/`target` caching is a deferred speed item.
+- **`GITEA_TOKEN` must retain release scope;** if an instance policy narrows
+  it, the release publish falls back to a repo-scoped PAT secret.
+
+## Alternatives considered
+
+- **Run on the runner host's nix.** Rejected — the probe showed steps run in a
+  container where host nix is unreachable.
+- **Install nix per-job in the default image.** Works but cold every run
+  (slow) and throwaway once the image exists; rejected in favour of the baked
+  image.
+- **`catthehacker` or bare `nixos/nix` as the base.** catthehacker is a
+  multi-GB runner emulation we don't need; bare `nixos/nix` lacks
+  `sleep`/`bash`/`node` and won't start. `node:22-bookworm-slim` is the small,
+  contract-satisfying middle (user's suggestion).
+- **A standard `rust:1.95` CI image instead of the flake.** Simpler in CI but a
+  *second* toolchain definition (drift) — counter to the unify-with-dev goal.
+- **A third-party Gitea release action.** Avoided; the API + auto token keep
+  the release self-contained and debuggable.
+
+## Deferred / out of scope (tracked, step by step)
+
+- **D1 matrix:** **macOS only** now (x86_64 + aarch64). The four non-macOS
+  targets shipped via cargo-zigbuild (see the 2026-06-13 amendment); macOS needs
+  Apple's SDK (osxcross + private SDK, or a Mac runner).
+- **D3 packaging:** Homebrew / Scoop / winget / `cargo-binstall` manifests
+  (and binstall-friendly asset naming/archives).
+- **Tier 4 (PTY E2E):** still unwired (`requirements.md` **TT4**); the gate runs
+  tiers 1–3 only, so **TT5** ("CI runs all tiers on Linux/macOS/Windows") is
+  partially met — Linux, tiers 1–3.
+- **CI speed:** dependency/`target` caching (cargo-chef into the image, or
+  `actions/cache`), and image slimming / `dind-cached` base-pull caching.
+- **Website deploy:** the static site → Cloudflare via Gitea Actions (a
+  separate, simpler workflow on the website branch).
+- **fmt gate:** revisit on `main` once a `rustfmt` style is chosen.
+
+## Relationship to other decisions
+
+- **Builds on ADR-ci-002** (nix flake dev + build env). This ADR adds the
+  musl-target/cc to that flake and consumes it from CI.
+- **Advances `requirements.md`:** **TT5** (CI runs the tiers — Linux, 1–3),
+  **D2** (static binary — Linux, done), **D1**/**D3** (partial/deferred).
+- **Mirrors the website subproject's** separate ADR namespace and its
+  static→Cloudflare-via-Gitea-Actions deployment posture (ADR-website-001).

docs/ci/adr/20260612-adr-ci-002.md

@@ -0,0 +1,145 @@
+# ADR-ci-002: Nix flake for a reproducible dev + build environment
+
+## Status
+
+**Accepted (2026-06-12).** Implemented the same day on the `ci` branch:
+`flake.nix`, `flake.lock`, `rust-toolchain.toml`, `.envrc`. Verified
+end-to-end before acceptance — `nix develop` provides the pinned
+toolchain; `nix build .#default` produces a working binary; `cargo
+clippy --all-targets -- -D warnings` is clean and `cargo test` is
+**2424 passed / 0 failed / 1 ignored** (the ignored item is the
+intentional ```` ```ignore ```` doctest at `src/friendly/mod.rs:21`),
+all run *through the flake*. This ADR is the dev/build-environment
+foundation; the CI **pipeline** that consumes it (runner model, image,
+gate, release) is **ADR-ci-001**.
+
+> **History.** Created as **ADR-0049** in `main`'s integer ADR namespace
+> (`docs/adr/`); moved here to **ADR-ci-002** on 2026-06-12 to keep the
+> CI/dev-env decisions out of `main`'s sequence and end the cross-branch
+> number collision (`main` independently reaches for the next integer too —
+> the same problem the website subproject hit). Content is otherwise
+> unchanged. See ADR-0000 "Numbering discipline".
+
+## Context
+
+The project is near feature-complete and CI is finally being set up
+(`requirements.md` **TT5**, **CI** in the deferred list). CI must not
+depend on whatever Rust/toolchain happens to be installed on the build
+machine — that is neither reproducible nor honest about what the build
+needs.
+
+The sibling project **datamage** already solved this with a Nix flake
+(its ADR 0046): the flake is the single, version-pinned declaration of
+the toolchain, and both the dev shell and CI go through it so they
+cannot drift. We adopt the same pattern here. Ours is dramatically
+simpler than datamage's — this is a pure-Rust TUI with no Tauri /
+WebKitGTK / Node / WASM surface — so the flake carries almost no system
+dependencies.
+
+Two build facts drove the (tiny) dependency set, confirmed from
+`Cargo.lock`:
+
+- **`libsqlite3-sys` is built with `bundled`** → SQLite is compiled
+  from vendored C, which needs a C compiler. `nixpkgs`' `stdenv`
+  provides one automatically; nothing is declared for it.
+- **`arboard`'s clipboard backend is `x11rb`** — a pure-Rust socket
+  XCB client that links *no* C X11 libraries. So no X11/`pkg-config`
+  system inputs are needed to build or test. A live X server is only
+  required at *runtime* to actually copy; headless sessions fall back
+  to OSC 52.
+
+## Decision
+
+Adopt a **Nix flake** at the repository root as the canonical
+declaration of the dev *and* build environment.
+
+- **`flake.nix`** exposes two outputs (user-chosen 2026-06-12 over a
+  dev-shell-only variant):
+  - **`devShells.default`** — the pinned Rust toolchain (from
+    `rust-toolchain.toml` via `rust-overlay`) plus `cargo-sweep` for
+    the `target/` build-hygiene discipline (CLAUDE.md / the datamage
+    ADR 0050 equivalent).
+  - **`packages.default`** (= `packages.rdbms-playground`) — a
+    `rustPlatform.buildRustPackage` that produces the binary
+    reproducibly from the pinned toolchain and the committed
+    `Cargo.lock` (`cargoLock.lockFile` → `importCargoLock`, which
+    fetches each dependency by its lockfile checksum: offline,
+    deterministic, no `cargoHash` to churn). `nix build` yields the
+    artifact CI's gate/release can consume.
+- **`rust-toolchain.toml`** pins an **exact stable release**
+  (`1.95.0`), not the floating `stable` channel, so `nix flake update`
+  cannot surprise-bump Rust into new clippy lints that would fail the
+  `-D warnings` gate (same reasoning as datamage ADR 0046). Components:
+  `rustfmt` + `clippy`. No coverage/WASM tooling and no
+  cross-compilation targets yet — those are added when the release
+  matrix needs them, not before.
+- **`flake.lock`** pins every input (`nixpkgs` `nixos-26.05`,
+  `rust-overlay`, `flake-utils`) to a commit, making the env
+  bit-reproducible.
+- **`.envrc`** contains `use flake` for direnv auto-activation, kept
+  for parity with datamage even though direnv is not installed on the
+  current dev VM (entry is via `nix develop`).
+- **`packages.default` sets `doCheck = false`.** The test suite is
+  *not* run during `nix build` — the Nix build sandbox has no `HOME`
+  and no X server, which fights the project-directory / clipboard
+  paths the tests touch. Tests run as their own CI stage via
+  `nix develop -c cargo test`, keeping "build the artifact" and "run
+  the suite" cleanly separate.
+- **The package version is read from `Cargo.toml`** via
+  `builtins.fromTOML`, so it never drifts from the crate metadata.
+
+## Consequences
+
+- **One toolchain definition.** Dev and CI share the exact pinned
+  toolchain; they cannot drift. New contributors run `nix develop`
+  (or get auto-activation via direnv) and have the same Rust as CI.
+- **D2 (static binary) is unaffected and still pending.** The
+  `nix build` artifact links the Nix-store glibc *dynamically* — it is
+  a reproducible build/test artifact, **not** the single static
+  release binary D2 calls for. Release binaries will target a static
+  toolchain (e.g. `x86_64-unknown-linux-musl`) in the forthcoming CI
+  release work; that is a release-step concern, not a dev-shell one.
+- **`fmt` is deliberately *not* gated yet.** The tree is not clean
+  under stock `rustfmt` (~100 files would change; no `rustfmt.toml` is
+  committed and the code was shaped by something other than default
+  `rustfmt`). Reformatting churns blame across every file and would
+  conflict with the in-flight website branch and ongoing `main` work,
+  so — user decision 2026-06-12 — the `fmt` gate is left out for now
+  and revisited on `main`. The CI gate is `clippy` + `test`.
+- **Engine-name posture (CLAUDE.md) is respected.** The flake's
+  comments may name SQLite/`rusqlite` where technically necessary
+  (build-input rationale); no user-facing string is affected.
+
+## Alternatives considered
+
+- **Dev-shell only (no build package).** Matches datamage exactly; CI
+  would `cargo build` inside `nix develop -c`. Rejected (user choice):
+  a `nix build` package gives a reproducible release artifact straight
+  from the pinned toolchain, which the release job wants.
+- **A standard `rust:1.95` image in CI, flake for dev only.** Simpler
+  in CI (no nix-in-CI caching to solve), but it is a *second* place
+  that defines the toolchain — exactly the drift this ADR exists to
+  prevent. Rejected for the unified-env goal; the nix-in-CI caching
+  cost is solved in the CI pipeline work instead.
+- **`rustup` on the build machine.** The status quo CI would replace —
+  non-reproducible, machine-dependent, the thing we are eliminating.
+
+## Relationship to other decisions
+
+- Mirrors **datamage ADR 0046** (nix flake dev env) and its build
+  hygiene companion. This is the rdbms-playground analogue, scoped to
+  a pure-Rust project.
+- Feeds **ADR-ci-001** (the CI + release pipeline), which consumes this
+  flake for `requirements.md` **TT5** (CI runs the tiers) and the
+  **D1/D2/D3** distribution items (the release uses a static musl target
+  built through this flake).
+
+## Amendment 1 — 2026-06-17: `fmt` gate enabled (issue #35)
+
+The deferred "revisit on `main`" is done. With the CI + website branches
+merged and before the first public release, the tree was reformatted once
+with **stock `cargo fmt`** (no `rustfmt.toml` — stable rustfmt supports no
+meaningful customisation, and the pinned 1.95.0 toolchain makes
+`fmt --check` deterministic) in a single mechanical commit (`41b7e9a`,
+102 files, behaviour-preserving; recorded in `.git-blame-ignore-revs`).
+`ci.yaml`'s gate is now **`fmt --check` + clippy + test**. Closes **#35**.

docs/ci/adr/20260613-adr-ci-003.md

@@ -0,0 +1,206 @@
+# ADR-ci-003: Cross-platform release builds (the D1 matrix)
+
+## Status
+
+**Accepted (2026-06-13); implemented the same day on the `ci` branch.** Every
+fork was settled with the user. Verified end-to-end:
+
+- all four targets cross-build locally from Linux x86_64;
+- the Linux binaries are statically linked (D2); the Windows artifacts are
+  valid PE32+ (x86-64 / Aarch64);
+- a real release-matrix run (tag `v.0.0.0-citest3`) published **8 assets** — the
+  four binaries + a `.sha256` each.
+
+**Runtime-verified (2026-06-13, by the user):** the **Linux x86_64** and
+**Windows aarch64** binaries launch and run correctly — one of each OS family
+and both architectures. The remaining two (**Linux aarch64**, **Windows
+x86_64**) are link-clean and valid format but not yet runtime smoke-tested.
+
+This ADR records the **cross-platform build strategy**; it sits on top of
+**ADR-ci-002** (the nix flake, which now carries the cross toolchain) and
+**ADR-ci-001** (the pipeline, whose release job this fills in).
+
+## Amendment 2 — 2026-06-16: CI on `main`; `release-macos` dispatched + verified
+
+The CI branch is **merged to `main`**, so `release-macos.yaml`
+(`workflow_dispatch`, Gitea-default-branch-only) is now triggerable. It
+has been **dispatched and verified end-to-end**: both `*-apple-darwin`
+targets build on the Tart runner, the de-nix/re-sign step runs, the
+assets upload to the tagged release, and the binaries launch. macOS is
+therefore runtime-verified (alongside the original Linux x86_64 +
+Windows aarch64); only **Linux aarch64** and **Windows x86_64** remain
+link-clean / valid-format without a runtime smoke-test.
+
+## Amendment — 2026-06-14: macOS implemented (closes D1)
+
+macOS is no longer deferred. The two `*-apple-darwin` targets now build on a
+**Tart (Apple-Silicon) macOS runner** registered to Gitea — building on **real
+Apple hardware** makes the SDK fully licensed, so the whole osxcross / SDK
+grey-area + public-image-redistribution problem (§5 below) simply **does not
+arise**. With all six D1 targets producing artifacts, **D1 is complete.**
+
+Details, all verified on the runner via a throwaway smoke-test before wiring the
+release leg:
+
+- **`release-macos.yaml`** — `workflow_dispatch` with a `tag` input,
+  `runs-on: macos`. The runner registered as `macos:host`, but `:host` is
+  act_runner's execution-backend schema (run on host, no container), **not** part
+  of the label, so the label is `macos`. Steps: `cargo test` (macOS gets the only
+  automated test coverage outside the Linux gate — user choice) → build both
+  darwin targets natively through the flake (`apple-sdk` added to the devShell so
+  the toolchain links AppKit) → **upload to the same release** via the idempotent
+  create-or-get.
+- **De-nix + re-sign.** The darwin stdenv bakes a `/nix/store` `libiconv` load
+  path into the binary (the *only* non-system dependency; everything else is
+  AppKit/Foundation/CoreGraphics/IOKit + `libSystem`/`libobjc`). The release step
+  rewrites it to `/usr/lib/libiconv.2.dylib` with `install_name_tool` and
+  **re-signs ad-hoc** (`codesign -f -s -`) — `install_name_tool` invalidates the
+  signature and Apple Silicon refuses an unsigned binary. A guard fails the build
+  if any `/nix/store` path remains. Result: portable, signed binaries (the native
+  one was confirmed to launch).
+- **Dispatch-only, intermittent runner.** The Mac isn't always on, so macOS is a
+  separate dispatched workflow (not a job in `release.yaml`) — a release always
+  carries the four Linux/Windows assets regardless of the Mac, and the two macOS
+  assets are added by dispatching `release-macos` for that tag. **Caveat:** Gitea
+  exposes `workflow_dispatch` only for workflows on the **default branch**, so
+  `release-macos` becomes triggerable once the CI work is merged to `main`.
+- **Cache hygiene (host-execution runner).** The runner wipes the workspace each
+  run, so cargo `target/` never accumulates; the persistent cache is the nix
+  store, bounded by **generation** — record the current devShell in a persistent
+  profile, keep the 2 newest generations (`nix-env --delete-generations +2`),
+  reclaim the rest. (The first sweep reclaimed a ~3.8 GB one-time backlog of
+  build scaffolding — source + build-only deps, not re-installed toolchains.)
+- **D2 on macOS.** macOS binaries cannot be fully static (`libSystem` is always
+  dynamic); "no runtime deps" there means *system libraries only*, which the
+  de-nix step guarantees.
+
+## Context
+
+`requirements.md` **D1** asks for binaries on **Linux, macOS, Windows × x86_64
+and aarch64** (six targets); **D2** asks for a **single static binary, no
+runtime deps**. The CI runner executes jobs in a **Linux x86_64** container
+(ADR-ci-001), so every target is **cross-compiled from Linux**.
+
+What's feasible is decided almost entirely by one dependency — **`arboard`**
+(the clipboard backend for the `copy` command). Its per-platform backends in
+`Cargo.lock`:
+
+| Target family | arboard backend | Needs a platform SDK to cross-link? |
+|---|---|---|
+| Linux x86_64 / aarch64 | `x11rb` (pure Rust) | No |
+| Windows x86_64 / aarch64 | `clipboard-win` + `windows-sys` (import libs bundled) | No |
+| **macOS x86_64 / aarch64** | **`objc2-app-kit` → links AppKit** | **Yes — Apple's SDK** |
+
+So **four targets cross-compile with no SDK**; **macOS is the hard wall** —
+AppKit can only be linked against Apple's SDK.
+
+## Decision
+
+### 1. Tooling — `cargo-zigbuild`
+
+Cross-compile with **`cargo-zigbuild`** (Zig's bundled clang + libc as a single
+universal cross `cc`/linker), added to the flake devShell alongside `zig`. One
+tool serves every non-macOS target, **including the `cc`-crate compile of
+rusqlite's bundled SQLite C**, with no per-target toolchain. It replaced the
+earlier single-target musl `cc` (ADR-ci-002's first cut).
+
+### 2. Targets this iteration — the four non-macOS
+
+Added to `rust-toolchain.toml` and the release matrix:
+
+- **`x86_64-unknown-linux-musl`**, **`aarch64-unknown-linux-musl`** — musl +
+  `crt-static`, so **fully static** portable binaries (D2);
+- **`x86_64-pc-windows-gnu`**, **`aarch64-pc-windows-gnullvm`** — Zig statically
+  links its libc, so the `.exe` is **standalone** (no mingw runtime DLLs).
+
+### 3. The Windows `synchronization` stub
+
+Rust's `std` links **`-lsynchronization`** (its `WaitOnAddress`-based thread
+parking). That import library is normally supplied by Rust's `rust-mingw`
+"self-contained" component — which **rust-overlay does not ship** — and Zig's
+mingw doesn't carry it either, so the link fails with *"unable to find dynamic
+system library 'synchronization'"*. The functions (`WaitOnAddress`,
+`WakeByAddress*`) are **forwarded by `kernel32`** (already linked), so an
+**empty stub** `libsynchronization.a` (committed at **`ci/winstub/`**, 8 bytes,
+wired via **`.cargo/config.toml`** for the Windows targets *only*) satisfies the
+linker without contributing symbols. Host and Linux builds are untouched by it.
+
+### 4. Workflow shape — test once, then a build matrix
+
+`release.yaml` is **`test` → `build`**:
+
+- **`test`** runs once on the host (`cargo test`) — a tag never publishes
+  untested code;
+- **`build`** is a **matrix over the four targets** (`needs: test`,
+  `fail-fast: false`), each `cargo zigbuild --release --target <triple>`, then
+  packages the binary (`.exe` for Windows) + a `.sha256` and uploads both to the
+  **shared release** via an **idempotent create-or-get** (the first matrix job
+  creates the release; the rest fetch it).
+
+### 5. macOS — deferred, with rationale
+
+macOS is **not** in this iteration. `arboard`→AppKit needs the macOS SDK, and:
+
+- the SDK ships **only inside Xcode**; Apple's license ties its use to
+  **Apple-branded hardware**, so using it on a Linux runner is a **grey area**
+  (widely done, low enforcement, but technically against the terms);
+- **redistributing** the SDK is a clearer violation — and our **CI image is
+  public**, so the SDK **cannot be baked into it** even if the grey area were
+  accepted; it would have to live in a private store;
+- the **clean** path is building on **real Apple hardware** (a Mac registered as
+  a Gitea runner, or hosted Mac CI), where the SDK is fully licensed.
+
+macOS therefore becomes its **own step**, choosing between **(a)** osxcross + a
+**private** SDK kept out of the public image, or **(b)** a **Mac runner**. The
+user decides when we get there.
+
+## Consequences
+
+- **D1: four of six targets met** from a single Linux runner; **D2 met on
+  Linux** (static musl). Windows `.exe`s are standalone.
+- **Runtime coverage:** Linux x86_64 + Windows aarch64 confirmed running
+  (user, 2026-06-13); Linux aarch64 + Windows x86_64 are the outstanding
+  runtime checks.
+- **Each matrix target recompiles from scratch** (~2–4 min; ~10 min total on the
+  single runner), and Zig's per-target libc cache is cold each run. Fine at
+  release frequency; cacheable later if it matters.
+- **The empty stub depends on `kernel32` forwarding `WaitOnAddress`** (true on
+  Windows 8+), which covers every supported target.
+- **Asset naming** `rdbms-playground-<tag>-<target>[.exe]` is close to what
+  `cargo-binstall` / the D3 package managers will want.
+
+## Alternatives considered
+
+- **`cross` (cross-rs).** Docker-image-per-target; covers Linux + Windows but
+  **not macOS** (no legally redistributable Apple images), and needs DinD
+  orchestration inside our job. Rejected — no macOS, more moving parts than
+  zigbuild.
+- **Per-target nix cross (`pkgsCross`).** Clean for Linux-musl and
+  Windows-x86_64 (mingw-w64, which *does* ship `libsynchronization.a`), but
+  Windows-aarch64 isn't readily packaged and **macOS-from-Linux is unsupported**
+  in nixpkgs. Rejected — incomplete.
+- **Native runners per OS.** Cleanest for macOS/Windows, but needs mac/windows
+  runners we don't have. Kept on the table specifically for the deferred macOS
+  step.
+- **A real `libsynchronization.a`** (from nixpkgs mingw or a `rust-mingw`
+  component) instead of the empty stub. More principled, but more flake
+  machinery, doesn't cover Windows-aarch64, and unnecessary — the stub links
+  clean because the symbols resolve via `kernel32`.
+
+## Deferred / out of scope
+
+- ~~**macOS** (x86_64 + aarch64)~~ — **done** via the Tart runner (see the
+  2026-06-14 amendment); §5 below is the as-deferred rationale, kept for history.
+- **D3 packaging** — Homebrew / Scoop / winget / `cargo-binstall` manifests
+  (and binstall-friendly archive naming).
+- **CI speed** — caching per-target builds / Zig's libc cache.
+- **Runtime smoke test** of the two not-yet-checked targets (Linux aarch64,
+  Windows x86_64).
+
+## Relationship to other decisions
+
+- **Extends ADR-ci-002** — the flake devShell now carries `cargo-zigbuild` +
+  `zig` and the four release targets.
+- **Fills in ADR-ci-001 §3 (Release)** — that single-target job is now this
+  matrix.
+- **Advances `requirements.md`** **D1** (4/6) and **D2** (Linux, done).

docs/ci/adr/README.md

@@ -0,0 +1,23 @@
+# CI / Build Architecture Decision Records
+
+Decision records for the **continuous-integration + release pipeline**
+subproject — the Gitea Actions workflows under `.gitea/`, the nix CI image,
+and the release tooling. These are kept in their own namespace, separate
+from the project-wide ADRs in [`docs/adr/`](../../adr/README.md), so CI
+decisions never compete with the main global ADR sequence for numbers — the
+same split the website subproject uses (`docs/website/adr/`, on the `website`
+branch), and for the same reason (see
+[ADR-0000 "Numbering discipline"](../../adr/0000-record-architecture-decisions.md)).
+
+**Numbering.** Files are named `<date>-adr-ci-<NNN>.md` and referenced in
+prose as `ADR-ci-NNN`. The `<date>` (the ADR's accepted/created day,
+`YYYYMMDD`) plus the `ci` segment keeps the namespace disjoint from `main`'s
+integers. Assign the next free `NNN` from this index. Every ADR change
+updates this index in the same edit (the ADR-0000 index-upkeep rule applies
+here too).
+
+## Index
+
+- [ADR-ci-001 — CI + release pipeline on Gitea Actions](20260612-adr-ci-001.md) — **Accepted 2026-06-12** (implemented the same day on the `ci` branch). Establishes the CI/release pipeline on the self-hosted Gitea instance's Actions runner (`ci-public`). **Runner model** (established by a throwaway probe): jobs execute *inside* a container (`catthehacker/ubuntu:act-22.04` by default), as root, so the runner host's nix is **not** reachable from steps. **Toolchain delivery:** a **baked CI image** — `node:22-bookworm-slim` (satisfies the act_runner job-container contract: `/bin/sleep` keep-alive, `bash`, `node` for JS actions; a bare `nixos/nix` image lacks these and won't start) **+ single-user nix + the flake's devShell pre-warmed** — built by `build-ci-image.yaml` via DinD and pushed to the Gitea container registry as a **public** package, so CI runs `nix develop -c …` against the **same pinned toolchain as dev** (the flake, ADR-ci-002) with a warm store (~1.4 s to a ready toolchain). **Gate** (`ci.yaml`): `clippy -D warnings` + `cargo test` inside that image on branch pushes + PRs; **fmt deliberately not gated** (the tree isn't stock-rustfmt-clean — user decision, revisit on `main`; see ADR-ci-002). **Release** (`release.yaml`): on a `v*` tag, runs the tests, builds the **static `x86_64-unknown-linux-musl` binary** (D2: single static binary, no runtime deps — the glibc/nix build is non-portable), strips it, and publishes it + a `.sha256` to a Gitea release via the API and the auto-provided `GITEA_TOKEN`. **Triggers:** gate + image-build are scoped to **branch** pushes (`branches: ['**']`) so a release tag doesn't spuriously re-run them; the image-build additionally path-filters to its inputs (Dockerfile/flake/toolchain); the release owns tags. **Auth:** a dedicated PAT (`REGISTRY_USERNAME`/`REGISTRY_TOKEN` secrets) pushes the image; the auto `GITEA_TOKEN` publishes releases. **Scope:** the original release job was Linux x86_64 only; it's now the **four non-macOS D1 targets** (Linux + Windows × x86_64/aarch64) cross-built via cargo-zigbuild — see **ADR-ci-003**. macOS, D3 package-manager manifests, CI-speed dependency caching, and the website's static→Cloudflare deploy remain deferred, added step by step. Verified live: probe → runner facts; image built + checked locally; gate green (**2424 tests**); release exercised end-to-end (`v0.0.0-citest2` published with binary + checksum). Builds on **ADR-ci-002** (the nix flake, relocated here from main's ADR-0049 to avoid exactly this cross-branch collision).
+- [ADR-ci-002 — Nix flake for a reproducible dev + build environment](20260612-adr-ci-002.md) — **Accepted 2026-06-12** (relocated from main's **ADR-0049** on the same day — content unchanged — to keep CI/dev-env decisions out of `main`'s integer sequence). The single, version-pinned declaration of the **dev *and* build toolchain** so CI never relies on whatever Rust is on the build machine — mirroring **datamage ADR 0046**, but far simpler (pure-Rust TUI). Root **Nix flake** with two outputs: **`devShells.default`** (pinned **Rust 1.95.0** via `rust-toolchain.toml` + `rust-overlay`, `cargo-sweep`, and the musl cc for the static release build) and **`packages.default`** (`rustPlatform.buildRustPackage` from the committed `Cargo.lock`; `doCheck = false`). Exact-pin (not floating `stable`) so `nix flake update` can't surprise-bump clippy past the `-D warnings` gate. System inputs near-empty by design (`libsqlite3-sys bundled` → stdenv cc only; `arboard`→`x11rb` pure-Rust). `.envrc` (`use flake`) for direnv parity. Verified through the flake: `nix build` yields a working binary, clippy clean, **2424 tests pass / 0 fail / 1 intentional ignored doctest**. Consumed by **ADR-ci-001** (the pipeline). Alternatives rejected: dev-shell-only; a standard `rust:1.95` CI image (a second toolchain definition = drift); `rustup` on the build host (non-reproducible). **Amendment 1 (2026-06-17, issue #35):** the deferred `fmt` gate is enabled — the tree was reformatted once with **stock `cargo fmt`** (no `rustfmt.toml`; pinned toolchain makes `fmt --check` deterministic) in a single mechanical commit (`41b7e9a`, 102 files, behaviour-preserving, in `.git-blame-ignore-revs`), and `ci.yaml`'s gate is now **`fmt --check` + clippy + test**.
+- [ADR-ci-003 — Cross-platform release builds (the D1 matrix)](20260613-adr-ci-003.md) — **Accepted 2026-06-13** (implemented + a real matrix release verified the same day — tag `v.0.0.0-citest3` published 8 assets). Cross-compiles the **four non-macOS D1 targets** from the Linux x86_64 runner with **`cargo-zigbuild`** (Zig's bundled clang + libc as one universal cross cc/linker, incl. rusqlite's bundled SQLite C; added to the flake devShell, replacing the single-target musl cc): **`x86_64`/`aarch64-unknown-linux-musl`** (musl + crt-static → fully static, **D2**) and **`x86_64-pc-windows-gnu`** / **`aarch64-pc-windows-gnullvm`** (Zig statically links libc → standalone `.exe`). **Windows `synchronization` stub:** Rust std links `-lsynchronization` (WaitOnAddress thread-parking), an import lib rust-overlay's toolchain doesn't ship and Zig's mingw lacks; the symbols are forwarded by `kernel32`, so an **empty 8-byte stub** `libsynchronization.a` (`ci/winstub/`, wired via `.cargo/config.toml` for the Windows targets only) satisfies the linker. **Workflow:** `release.yaml` = **`test` once (host) → `build` matrix** over the four targets (`needs: test`, `fail-fast: false`); each job packages binary (`.exe` for Windows) + `.sha256` and uploads to the **shared release** via idempotent create-or-get. **macOS** (2026-06-14 amendment) — built natively on a **Tart (Apple-Silicon) runner** (`runs-on: macos`), which makes the SDK fully licensed and dissolves the grey-area/public-image problem; `release-macos.yaml` is **dispatch-only** (intermittent runner), de-nixes the binary's libiconv load path (`install_name_tool` → `/usr/lib`) + re-signs ad-hoc, and uploads to the tagged release. **D1 complete (all six targets).** Alternatives rejected: `cross` (no macOS, needs DinD), per-target nix cross (Windows-aarch64 unpackaged, macOS-from-Linux unsupported), a real `libsynchronization.a` (more machinery, doesn't cover Windows-aarch64). **Amendment 2 (2026-06-16):** CI is **merged to `main`**, so `release-macos` is now triggerable (`workflow_dispatch` is default-branch-only) and has been **dispatched + verified end-to-end** (build → de-nix/re-sign → upload, binaries launch). Runtime-verified by the user: Linux x86_64, Windows aarch64, **and both macOS targets**; Linux aarch64 + Windows x86_64 are the outstanding runtime checks. Builds on ADR-ci-002 (flake) and fills in ADR-ci-001 §3 (Release).

docs/ci/handoff/20260615-handoff-ci-01.md

@@ -0,0 +1,104 @@
+# CI subproject handoff — 2026-06-15 (ci-01)
+
+First handover for the **CI / release subproject** (the `ci` branch). Kept in
+`docs/ci/handoff/`, a namespace separate from the project's global
+`docs/handoff/` session sequence so it can't collide with `main`'s numbering —
+the same split as `docs/ci/adr/`, and needed for the same reason: `main`
+independently wrote its own **handoff-70** this same day (just as it took
+**ADR-0049**), which would have collided.
+
+A dedicated infrastructure session that built the project's **entire CI/CD
+pipeline** on the self-hosted Gitea Actions runner — from nothing to a live
+gate plus a six-target cross-platform release. Net: the **CI** /
+`requirements.md` **TT5** item and **D1**/**D2** are now done; **D3** and a
+couple of TT5 tails remain. Decisions are recorded in the sibling ADR namespace
+**`docs/ci/adr/`** (ADR-ci-001/002/003).
+
+## §1. State at handoff
+
+**Branch:** `ci` (worktree). **`main` has been merged into `ci`** (commit
+`138e766`, clean — `ci` and `main` touched disjoint files) so the gate runs
+against current `main` before CI lands there. Working tree clean except the
+in-progress doc updates from this handoff. Pushes/promotion are the user's
+step.
+
+**Gate verified locally on the merged code:** `clippy -D warnings` clean;
+**`cargo test` 2488 passing / 0 failing / 1 ignored** (the long-standing
+`friendly` doctest). main's features came in with their tests (2424 → 2488).
+
+**Pipeline (`.gitea/workflows/`):**
+
+- `build-ci-image.yaml` — builds + pushes the CI image (`node:22-bookworm-slim`
+  + single-user nix + the flake's devShell pre-warmed) to the Gitea registry.
+  Triggers only on image-input changes (Dockerfile / flake / toolchain).
+- `ci.yaml` — the gate: `clippy -D warnings` + `cargo test`, branch pushes + PRs
+  (docs-only changes skipped).
+- `release.yaml` — on a `v*` tag: `test` → `build` matrix over the **four
+  non-macOS** targets via `cargo-zigbuild`, upload to the Gitea release.
+- `release-macos.yaml` — **workflow_dispatch** (tag input) on the Tart
+  Apple-Silicon runner (`runs-on: macos`): test → build both `*-apple-darwin`
+  → de-nix `libiconv` + ad-hoc re-sign → upload.
+
+**Verified live this session:** the 4-target release published **8 assets**
+(binary + `.sha256` each) for tag `v.0.0.0-citest3`; the macOS build was proven
+portable (system-only deps) + signed + launches on the runner.
+
+## §2. What was built (and the non-obvious bits)
+
+- **Nix flake** (ADR-ci-002, relocated from a would-be `main` ADR-0049): one
+  pinned toolchain (`1.95.0`) for dev *and* CI; `cargo-zigbuild` + `zig` (Linux
+  only) for the cross targets; `apple-sdk` on darwin.
+- **Runner facts** (ADR-ci-001): jobs run *inside* a container (`ci-public` →
+  `catthehacker/ubuntu`), so host nix is unreachable — hence the baked image.
+  The Mac runner is **host execution**; its label is `macos` (`:host` in the
+  registration is the act_runner backend, not part of the label).
+- **Cross-compile** (ADR-ci-003): `cargo-zigbuild` for the 4 non-macOS targets.
+  Windows needs an **empty `libsynchronization.a` stub** (`ci/winstub/`, wired
+  via `.cargo/config.toml`) — std links `-lsynchronization`, absent from
+  rust-overlay's toolchain + zig's mingw, but forwarded by `kernel32`.
+- **macOS** (ADR-ci-003 amendment): built on **real Apple hardware** (Tart), so
+  the SDK is fully licensed — no osxcross grey area. The darwin stdenv bakes a
+  `/nix/store` `libiconv` path into the binary; the build rewrites it to
+  `/usr/lib/libiconv.2.dylib` (`install_name_tool`) and re-signs ad-hoc
+  (`codesign -f -s -`; `install_name_tool` invalidates the signature, arm64
+  refuses unsigned). A guard fails the build on any remaining `/nix/store` dep.
+- **Cache hygiene (Mac):** the runner wipes the workspace each run, so cargo
+  `target/` never accumulates; the persistent nix store is bounded by
+  **generation** (record the devShell in a persistent profile, keep the 2
+  newest via `nix-env --delete-generations +2`, GC the rest). First sweep
+  reclaimed a ~3.8 GB one-time backlog of build scaffolding (source + build-only
+  deps, *not* re-installed toolchains).
+
+## §3. Immediate next steps (user)
+
+1. **Push `ci`** → the gate re-runs in CI (should be green; no image rebuild —
+   the merge didn't touch the flake/Dockerfile).
+2. **Promote:** `git checkout main && git merge ci` — a **fast-forward** (`ci`
+   already contains `main`) — then push `main`. CI goes live; `release-macos`
+   becomes dispatchable (workflow_dispatch needs the default branch).
+3. **First real release:** tag `v0.1.0` (auto-builds the 4 Linux/Windows
+   assets), then **dispatch `release-macos` for `v0.1.0`** with the Mac up (adds
+   the 2 macOS assets) → a full 6-binary release.
+4. **Cleanup:** delete the `v.0.0.0-citest*` test tags + their releases.
+5. **Runner-side:** add `min-free`/`max-free` to the Mac's `/etc/nix/nix.conf`
+   as a hands-off nix-store backstop.
+
+## §4. Known gaps / follow-ups
+
+- **Versioning is not wired into the binary** (flagged by the user). The release
+  **git tag is nowhere in the produced binary** — there is no `--version` flag,
+  no `CARGO_PKG_VERSION` use anywhere in `src/`, and the release workflows use
+  the tag only for the *release name* + *asset filenames*
+  (`rdbms-playground-<tag>-<target>`). `Cargo.toml` is a static `version =
+  "0.1.0"`, decoupled from the tag. So a `v0.5.0` tag yields a `…-v0.5.0-…`
+  asset whose binary knows nothing of "0.5.0". To fix later: add a `--version`
+  flag, and inject the tag at build time (e.g. a `build.rs` reading a
+  CI-provided env, or bumping `Cargo.toml` as part of tagging) so the binary and
+  the release agree.
+- **D3 packaging** — Homebrew / Scoop / winget / `cargo binstall` manifests
+  (asset naming is already binstall-friendly).
+- **TT5 tails** — Windows is build-only (no execution runner); Tier-4 PTY (TT4)
+  is unwired in CI.
+- **`fmt` gate** — deliberately off (tree isn't stock-`rustfmt`-clean); revisit
+  on `main`.
+- **Website → Cloudflare** deploy — the separate, simpler workflow, still to do.

docs/ci/handoff/README.md

@@ -0,0 +1,21 @@
+# CI / Build subproject — session handoffs
+
+Handover notes for the **CI / release pipeline** work (the Gitea Actions
+workflows under `.gitea/`, the nix flake, the release tooling). Kept in their
+own namespace, separate from the project-wide session handoffs in
+[`docs/handoff/`](../../handoff/), so a CI-branch handoff never competes with
+`main`'s global handoff sequence for numbers — the same split the CI ADRs use
+([`docs/ci/adr/`](../adr/README.md)). This is not hypothetical: `main`
+independently wrote a `handoff-70` the same day this subproject's first handoff
+was drafted.
+
+**Numbering.** Files are named `<date>-handoff-ci-<NN>.md` and referenced in
+prose as `handoff-ci-NN`. Assign the next free `NN` from this index.
+
+## Index
+
+- [handoff-ci-01 — the CI/release pipeline build-out](20260615-handoff-ci-01.md)
+  — Gitea Actions gate (clippy + test) + a six-target release (four via
+  `cargo-zigbuild` on a `v*` tag, two macOS via dispatch on a Tart runner), all
+  on a nix flake; decisions in `docs/ci/adr/`. Built on the `ci` branch, merged
+  `main` in, gate green (2488 tests), ready to promote to `main`.

docs/handoff/20260610-website-handoff-1.md

@@ -0,0 +1,181 @@
+# Website-branch handoff — 2026-06-10 (website-1)
+
+First handoff for the **website** work. This is a **separate sequence** from
+`main`'s `YYYYMMDD-handoff-NN.md` files — branch-scoped name on purpose, so
+the two don't collide. Continue numbering these `…-website-handoff-N.md`.
+
+## State
+
+- **Branch:** `website`. **HEAD `936d925`.** Not pushed (push is the user's
+  step). Working tree clean.
+- The website lives in **`website/`** (monorepo; the playground crate is at
+  the repo root). Decisions: **ADR-0044**
+  (`docs/adr/0044-public-website-and-documentation-site.md`). Implementation
+  plan: **`docs/plans/20260604-adr-0044-website.md`**. Living style guide:
+  **`website/STYLE.md`** (read this first — it has the binding conventions
+  and an open-decisions log).
+
+## Stack & layout
+
+- **Astro 6 + Starlight + Tailwind v4**, all under `website/`.
+- `website/astro.config.mjs` — Starlight config (title, 5-section sidebar,
+  Expressive Code `langs`, `server.host: '127.0.0.1'`).
+- `website/src/grammars/rdbms.mjs` — custom Shiki grammar, **two language
+  ids**: `rdbms` (real commands) and `rdbms-syntax` (abstract templates).
+- `website/src/styles/global.css` — Starlight↔Tailwind bridge + the `> `
+  command prompt + copy-button hiding (CSS `:has()`).
+- `website/src/content/docs/` — the five sections.
+
+## Commands
+
+```sh
+cd website
+pnpm install      # node_modules is gitignored — reinstall on a fresh checkout
+pnpm dev          # serves http://127.0.0.1:4321  (see dev-server gotcha below)
+pnpm build        # static dist/, 24 pages, Pagefind search index
+```
+
+**Dev-server gotcha (already fixed, don't re-break):** Astro/Vite's default
+`localhost` bind resolves to IPv6 `::1` here, which breaks SSH
+`-L 4321:127.0.0.1:4321` tunnels. `server.host: '127.0.0.1'` in the config
+pins IPv4. Tunnel with `ssh -L 4321:127.0.0.1:4321 <host>`.
+
+**Verify after changes:** `pnpm build` clean; then from the repo root
+`grep -rniE '\b(DSL|SQLite|STRICT|rusqlite|PRAGMA)\b' website/src/content/`
+must be empty; internal links should resolve (build doesn't fail on broken
+links — no validator installed — so sanity-check by hand or with a small
+script).
+
+## Documentation structure (5 sections, autogenerated per directory)
+
+1. **Getting started** — install, first-project, modes, example-library. **(real)**
+2. **Using the playground** — command-line-options, the-assistive-editor,
+   the-output-pane, projects, undo-and-history, export-and-import,
+   copy-to-clipboard, getting-help. **(real, grounded)** *This is "the app you
+   drive", distinct from the database-language Reference.*
+3. **Guides** — build-the-library **(DRAFT — marked; to be iterated for
+   teaching quality before publication)**.
+4. **Reference** — types **(real)**, tables **(real)**; columns,
+   relationships, indexes, constraints, inserting-and-editing-data,
+   querying-and-inspecting **(STUBS — real syntax synopsis + an "In progress"
+   note; THEY NEED WORKED EXAMPLES — this is the main remaining bulk)**.
+5. **Concepts** — projects-and-storage **(real)**.
+- Landing: `index.mdx` splash (feature cards incl. the assistive editor +
+  start-here links).
+
+## Binding conventions (STYLE.md / ADR-0044 §7)
+
+- **No "DSL"** in user-facing copy → "simple mode" / "advanced mode".
+- **No engine name** (SQLite/STRICT/rusqlite/PRAGMA) → "the database" / "the
+  engine".
+- **Code fences:** simple-mode commands → ` ```rdbms ` (highlighted; gets a
+  decorative copy-safe `> ` prompt via CSS). Abstract syntax templates →
+  ` ```rdbms-syntax ` (highlighted, **no** prompt, no copy button). Advanced
+  SQL → ` ```sql `. Shell → ` ```sh `.
+- **One command per line** in `rdbms` blocks. A multi-line *single* statement
+  (advanced `CREATE TABLE`) goes in ` ```sql `.
+- **Copy button** is hidden on multi-line `rdbms` blocks and on
+  `rdbms-syntax` (the app input is single-line — a multi-command paste isn't
+  runnable); kept on single-command `rdbms`, and all `sql`/`sh`.
+- Unshipped features → `:::caution[Planned]` aside; never presented as
+  shipped.
+- **Ground every page in source** — `parse.usage.*` / `help.*` in
+  `src/friendly/strings/en-US.yaml`, `src/dsl/command.rs`, `src/dsl/types.rs`,
+  the ADRs. **Do not** trust `requirements.md` markers (handoff-59 found
+  ~46% mis-marked; it now uses a `[/]` partial legend) — verify against code.
+
+## Canonical example database (use in every example)
+
+A small **library**: `authors`(author_id serial pk, name text, birth_year
+int) · `books`(book_id serial pk, title text, author_id int→authors,
+published int, isbn text unique) · `members`(member_id serial pk, name text,
+joined date) · `loans`(loan_id serial pk, book_id int→books, member_id
+int→members, loaned_on date, returned_on date). 1:n author→books; m:n
+books↔members via loans. **Simplest examples lead with bare `with pk`** (a
+default `id` key); the library build uses **named** keys (`author_id`, …) so
+relationships read clearly.
+
+## Verified syntax cheat-sheet (don't re-derive)
+
+- Simple create: `create table <T> with pk [<col>(<type>)[, ...]]` (bare =
+  default `id`); `add column [to] [table] <T>: <name> (<type>)`;
+  `rename column [in] [table] <T>: <old> to <new>`; `change column … (<type>)
+  [--force-conversion|--dont-convert]`; `drop column [from] [table] <T>: <col>
+  [--cascade]`.
+- Advanced create: `create table T (id serial primary key, …, col int
+  references parent(col))` (verified against `tests/it/sql_create_table.rs`).
+- Relationship: `add 1:n relationship [as <name>] from <P>.<col> to <C>.<col>
+  [on delete <action>] [on update <action>] [--create-fk]`;
+  compound: `from <P>.(a, b) to <C>.(x, y)`; drop by name or by endpoints.
+- Data: `insert into T [(cols)] [values] (vals)`; `update T set … (where … |
+  --all-rows)`; `delete from T (where … | --all-rows)`.
+- Inspect: `show data <T> [where …] [limit n]`, `show table <T>`, `show
+  tables|relationships|indexes`, `show relationship|index <name>`.
+- `explain <…>` (query plan; safe — never executes). Advanced `select …`.
+- 10 types: text int real decimal bool date datetime blob serial shortid;
+  advanced-mode SQL aliases (integer/varchar/timestamp/numeric/…).
+- App commands: save / save as / new / load / rebuild / export [path] /
+  import <zip> [as <t>] / undo / redo / replay <path> / mode / help
+  [<command>] / help types / copy [all|last] / quit. (`hint` and `seed` are
+  NOT implemented — mark planned/omit.)
+
+## Next work (priority order)
+
+1. **Fill the 6 Reference stubs** with worked examples on the library schema
+   (the remaining bulk). Each has a syntax synopsis + an "In progress" note —
+   expand to full content: worked example(s), both simple + advanced forms
+   where both apply, cross-links. This is the biggest chunk.
+2. **Iterate the Guides** for teaching quality; add guides (model a 1:n / m:n,
+   querying with joins). The user flagged guides as the most important
+   didactic content, to be polished before publication.
+3. **Phase B — landing polish:** use the `frontend-design` skill; set
+   Starlight `site` (production URL) once the domain is known (enables sitemap
+   + OG/SEO); add a logo + favicon (small Starlight config). Branding palette
+   when the user wants it (staying on Starlight; community themes were
+   surveyed — see ADR-0044 / chat).
+4. **asciinema casts — DEFERRED until the app is final** (ADR-0044 §2). When
+   starting, settle STYLE.md open-decision #9: scripted-input driver
+   (`asciinema-automation` vs `autocast` — prove with a throwaway test run),
+   `.cast` script format + repo location, terminal geometry, light/dark
+   player theme, file naming. The **assistive editor** is prime cast material
+   (completion / `[ERR]`/`[WRN]` indicator are motion a still block can't
+   show) — earmark a cast for it on the landing + the assistive-editor page.
+5. Remaining STYLE.md open decisions: **versioning** (leaning single-version
+   for launch) and **SEO/meta** (settle with Phase B + the `site` URL).
+
+## Process pins
+
+- **Commits:** user-confirmed (show the message first), **no AI attribution**,
+  **append-only** (no amend/rebase/force-push). Push is the user's step.
+- **ADR numbering:** assigned at merge-to-`main` (ADR-0000 "Numbering
+  discipline", added this branch). The website ADR is **0044** — renumbered
+  from 0042 on the `main` merge, because `main` had independently used 0042
+  (H1a) and 0043 (compound-FK).
+- **Issues:** Gitea via `tea` (repo `oli/rdbms-playground` on
+  `git.lazyeval.net`); append `< /dev/null` + `timeout 30`; never raw API.
+- **Escalate genuine forks**, declare epistemic status, write down the DA pass
+  (`/runda`) on non-trivial plans.
+
+## Commit history on this branch (newest first)
+
+```
+936d925 feat: add "Using the playground" section + Reference skeleton
+44390e7 feat: simple-mode code-block highlighting, prompt, and copy rules
+995c0ba docs: reconcile website doc inventory with merged main scope
+c72c624 chore: bind website dev/preview server to IPv4 loopback (127.0.0.1)
+9e774b2 docs: ADR numbering discipline — assign numbers at merge-to-main
+40de389 Merge branch 'main' into website (Gitea migration + ADR renumber)
+0fcb7b1 docs: website docs structure + first content pages
+cea99e8 chore: scaffold website (Astro 6 + Starlight + Tailwind v4)
+1fad29c docs: ADR-0042 — public website + documentation site plan   (now ADR-0044)
+```
+
+## Review status (what the user has signed off)
+
+Highlighting / `> ` prompt / copy behavior — good. Voice, altitude,
+terminology — good. Responsive layout (checked in Polypane) — good. Locked
+decisions: bare `with pk` leads the simplest examples; copy hidden on
+multi-command blocks (not per-command copy); the 5-section structure with
+"Using the playground" near the top; assistive editor surfaced on
+landing + Getting started. **The 6 Reference stubs have not been reviewed for
+content** — only their syntax synopses exist.

docs/handoff/20260611-website-handoff-2.md

@@ -0,0 +1,205 @@
+# Website-branch handoff — 2026-06-11 (website-2)
+
+Second handoff for the **website** work (separate sequence from `main`'s
+`YYYYMMDD-handoff-NN.md`). Read `website-1` (2026-06-10) first for the
+original scaffolding context; this note covers everything since.
+
+## State
+
+- **Branch:** `website`. **HEAD `e782a28`.** Working tree clean. Pushed
+  through an earlier point; currently **ahead of `origin/website`** (push is
+  the user's step — never push).
+- The website lives in **`website/`** (monorepo; the playground crate is at
+  the repo root). Living style guide + binding conventions:
+  **`website/STYLE.md`** (read first). Website decisions:
+  **`docs/website/adr/20260604-adr-website-001.md`** (the website ADR namespace
+  — see below). Plan: `docs/website/plans/20260604-website-implementation-plan.md`.
+
+## What changed since website-1 (commit highlights, newest first)
+
+```
+e782a28 feat(website): projects cast (vi-nav load picker) + --demo on all casts
+927e6b2 Merge branch 'main' (m:n, logging, UI nav, demo overlays, vi-nav)
+52860c3 feat(website): casts for first-project/modes/undo-redo; quit via Ctrl-C
+ce153bd docs(website): add SQL queries reference page (advanced query surface)
+302329d docs(website): record the cast-placement policy in STYLE.md
+bb7887e feat(website): relationship-diagram cast on the relationships page
+65a48fa feat(website): joins cast on the querying-with-joins guide
+c0cc92a docs(website): rewrite Build the library + add Querying with joins guide
+10655e4 docs(website): fill the six Reference stubs with worked examples + output
+a8f84c9 feat(website): refine casts — trim shell, autoplay+loop landing, cap size
+…       (cast pipeline, the astro/starlight upgrade, the ADR-namespace move)
+```
+
+## ADR namespace (important — avoids the recurring collision)
+
+Website decision records live in their **own namespace**:
+`docs/website/adr/` (`<date>-adr-website-<NNN>.md`, id `ADR-website-NNN`),
+indexed by `docs/website/adr/README.md`. They do **not** draw from `main`'s
+global ADR integer pool, so a `main` ADR and a website ADR can never collide
+again (this is why the latest merge of `main`'s ADR-0045/0046/0047 was
+conflict-free). Recorded in ADR-0000 "Numbering discipline". The main
+`docs/adr/README.md` intro carries a pointer to the website namespace.
+
+## Content status
+
+**Done & verified (build clean, grounded in source, forbidden-terms clean):**
+- **Getting started** — installation, first-project, modes, example-library.
+- **Using the playground** — command-line-options, the-assistive-editor,
+  the-output-pane, projects, undo-and-history, export-and-import,
+  copy-to-clipboard, getting-help.
+- **Guides** — build-the-library (full 4-table build, 1:n + m:n bridge),
+  querying-with-joins.
+- **Reference** — types, tables, columns, relationships, indexes, constraints,
+  inserting-and-editing-data, querying-and-inspecting, **sql-queries** (the
+  advanced SELECT surface: DISTINCT, GROUP BY/HAVING, set ops, subqueries,
+  CTEs, CASE/CAST/functions, with a "supported subset" boundary note).
+- **Concepts** — projects-and-storage.
+- Landing `index.mdx` splash with the quickstart cast.
+
+**26 pages build clean.** Only expected warning: sitemap needs `site` (Phase B).
+
+## asciinema casts — the pipeline + the 7 casts
+
+Pipeline (STYLE.md "asciinema casts", ADR-website-001 §2):
+- **Driver: `autocast`** (chosen by spike; `asciinema-automation` can't drive a
+  full-screen TUI). Sources in `website/casts-src/casts.mjs`; `pnpm casts`
+  runs `casts-src/generate.mjs` → autocast YAML → `public/casts/<name>.cast`.
+  Command-lists are the durable source; **`.cast` files are regenerable** —
+  re-run `pnpm casts` (needs a `cargo build` binary at `../target/debug`).
+- **Components:** `Cast.astro` (asciinema-player island) wrapped by
+  `Demo.astro` (the WASM-swap seam, ADR-website-001 §3). Embed via `<Demo
+  src="/casts/NAME.cast" … />` in an **.mdx** page (md can't import).
+- **Generator features:** trims each cast to the in-app region (drops shell
+  launch + the return-to-shell); ends casts with **Ctrl-C** (`{ key: 'CtrlC' }`)
+  not a typed `quit` (invisible, so the cast ends on the last content frame);
+  per-cast `holdEnd`, `dataDir` (isolated data root, wiped per run), and
+  **`--demo` is default-on** (opt out with `demo:false`).
+- **The 7 casts:** quickstart (landing, autoplay+loop), assistive-editor,
+  relationship-diagram, joins, modes, undo-redo, **projects** (the new one:
+  save as → new → load via the picker, navigated with `j`).
+
+### `--demo` (#22 / ADR-0047) is on for ALL casts
+The demonstration overlay shows a **badge** for special keystrokes
+(`[ENTER]`, `[TAB]`, arrows, etc.) — plain characters are NOT badged. This
+makes e.g. the assistive-editor's Tab completion visible (`[TAB]`), and the
+projects cast's `j`/`k` picker navigation stays *un*surfaced (plain chars) by
+design. Captions exist too (a stealth `Ctrl+]`-delimited banner) — usable in
+casts for neutral "point something out" labels, not yet used.
+
+### ⚠️ Cast tooling limits (don't rediscover these)
+- autocast can only send **single characters, ASCII control codes (`^X`), and
+  waits** — **NO arrows / PageUp/PageDown / Home/End / function keys** (those
+  are escape sequences; the per-key delay makes the terminal read a lone Esc —
+  verified). So any interaction we want to demo must be reachable via typeable
+  keys. This is why #24 (vi `j/k` in the picker) was needed for the projects
+  cast, and why **output-pane scrolling has no cast** (needs PgUp/PgDn).
+- `Ctrl+]` (caption toggle) and `Ctrl-C` (quit) ARE sendable (`^]`, `^C`).
+
+### ⚠️ No-advertising constraint (user, 2026-06-11)
+The docs must **NOT** advertise that the load picker supports **vi keys**, nor
+that **`Ctrl+]`** is the caption/banner trigger. The `--demo` flag itself MAY
+be documented lightly as "a teaching helper that shows special keystrokes" —
+and nothing more. Casts may *use* vi-nav and captions (the viewer sees only the
+result/banner, not the keystroke), but cast captions must not name `j/k` or
+`Ctrl+]`.
+
+## NEXT WORK — priority order
+
+### 1. Document the features the `main` merge brought (the biggest gap)
+The merge (`927e6b2`) added app features that are **not yet documented**:
+
+- **m:n convenience command** — `create m:n relationship …` (C4, **ADR-0045**).
+  The relationships page currently models m:n only via the manual loans-bridge.
+  Document the convenience command (it auto-generates the junction table).
+  Ground in ADR-0045 + `tests/it/m2n.rs` + `tests/typing_surface/create_m2n.rs`
+  for exact syntax. Likely a new section on the **relationships** reference
+  page and/or a mention in the build-the-library guide.
+- **`--demo` flag** — document on **command-line-options** as a teaching helper
+  that "shows special keystrokes" (per the no-advertising constraint above —
+  do NOT mention badges-for-vi or captions/`Ctrl+]`).
+- **ADR-0046 UI** — the **schema sidebar** (auto-shows on wide terminals,
+  `Ctrl-O` navigation mode to peek/expand), **responsive two-row input** +
+  horizontal scroll, and the geometry-fixed hint panel. Decide where in *Using
+  the playground* (a new "the schema sidebar" page, or fold into the-output-pane
+  / the-assistive-editor). Ground in ADR-0046.
+- FK-message fixes + the X1 logging sweep: **no user-doc impact** (note only).
+
+Whenever output changed because of the merge, **re-verify any affected static
+output blocks** (capture-harness recipe below).
+
+### 2. Consider a final cast re-record sweep + optional captions
+- All casts re-record with `pnpm casts` once the app is "final".
+- **Chase up two pacing/clarity guidelines across the existing casts** (added
+  to STYLE.md "Cast pacing & clarity" 2026-06-11; the projects cast already
+  follows them):
+  1. **Don't submit a command too fast** — a typed-and-`Enter`ed-in-one-instant
+     command vanishes before the viewer reads it. Re-review each cast for
+     type-then-instant-Enter (especially modal confirms / short commands) and
+     add a pause before `Enter` (split `type` and `key:'Enter'` steps).
+  2. **Show state where the sidebar would** — at 90 cols the schema sidebar is
+     hidden (ADR-0046), so insert `show tables` / `show table` / `show data`
+     where state changes, so the viewer can follow what happened.
+- **Review whether caption banners would improve the existing casts.** The
+  demo overlay can show a neutral step **caption** (the stealth `Ctrl+]`
+  banner) to label or narrate a moment — e.g. marking the phases of the
+  build-the-library/projects casts, or calling out the relationship diagram /
+  the teaching echo in the modes cast. Go cast-by-cast and decide where a
+  caption adds clarity vs. adds noise. Constraint: caption **text must not name
+  keys** (no `j/k`, no `Ctrl+]`); it narrates *what* is happening, not *how* it
+  was typed. (Captions are wired but not yet used in any cast.)
+- Output-pane scrolling cast remains blocked (PgUp/PgDn unsendable). If desired
+  later, it needs an app-side typeable scroll key (file an enhancement like #24)
+  — otherwise leave it to static docs.
+
+### 3. Phase B — landing/site polish
+- Set Starlight **`site`** (production URL) → clears the sitemap warning,
+  enables sitemap + canonical/OG. Then SEO/meta conventions (STYLE #8).
+- Logo + favicon; branding palette (staying on Starlight).
+- **Light/dark player theme**: the asciinema player theme is currently fixed
+  (`asciinema`); sync it to the Starlight theme toggle (folded into STYLE #8).
+- Use the `frontend-design` skill.
+
+### 4. Open STYLE.md decisions
+- **#7 Versioning** (leaning single-version for launch).
+- **#8 SEO/meta** + the player light/dark theme.
+
+## Capture-harness recipe (how to get accurate static output for new pages)
+
+Output blocks must be **captured from the real app, never hand-drawn**
+(STYLE.md). Pattern used throughout:
+- For `pub` render fns (`render_data_table`, `render_explain_plan`) + the DB
+  worker API: a throwaway **external** test `tests/doc_capture.rs` that builds
+  the library schema via `Database` and prints rendered output; run
+  `cargo test --test doc_capture -- --nocapture --ignored`; paste verbatim
+  (trim trailing spaces); delete the file.
+- For `pub(crate)` fns (`render_structure_with_diagrams`,
+  `render_relationship_diagram`): an in-crate `#[ignore]` test in
+  `src/output_render.rs`'s test module instead.
+- **Verify box-drawing integrity** after pasting (top `┬` count == bottom `┴`,
+  equal line lengths) — a mis-paste truncated a CTE border once and the check
+  caught it.
+
+## Verify-after-changes checklist
+```sh
+cd website && pnpm build            # clean; 26 pages; only the `site` warning
+# from repo root — forbidden terms must be empty:
+grep -rniE '\b(DSL|SQLite|STRICT|rusqlite|PRAGMA)\b' website/src/content/
+# internal links + heading anchors: spot-check in dist/ (no link validator installed)
+cd website && pnpm casts            # regenerate all casts (needs target/debug binary)
+```
+Dev server + tunnel for visual checks (player playback, sizing, badges):
+`cd website && pnpm dev` (binds 127.0.0.1:4321) then `ssh -L 4321:127.0.0.1:4321 <host>`.
+**Visual playback of all 7 casts (now with `--demo` badges) is still pending a
+tunnel check by the user.**
+
+## Process pins
+- **Commits:** user-confirmed (show the message first), **no AI attribution**,
+  **append-only** (no amend/rebase/force-push). Push is the user's step.
+- **Ground every page in source** (`src/dsl/*`, `en-US.yaml`, the ADRs) — not
+  `requirements.md` markers. No engine name, no "DSL" in user-facing copy.
+- **Issues** via `tea` (repo `oli/rdbms-playground` on `git.lazyeval.net`;
+  append `< /dev/null` + `timeout 30`). Open/related: **#22** (demo overlay,
+  implemented), **#24** (vi picker nav, implemented). Both merged via `927e6b2`.
+- Escalate genuine forks; declare epistemic status; write down the `/runda` DA
+  pass on non-trivial plans.

docs/handoff/20260615-handoff-70.md

@@ -0,0 +1,165 @@
+# Session handoff — 2026-06-15 (70)
+
+Seventieth handover. Continues from handoff-69 (which closed the last
+four Gitea issues and left the tracker empty). This session did the
+**ADR-0052 follow-up** (unwinding vestigial worker `source` plumbing),
+then **designed and fully implemented H2 — the contextual `hint`
+command + F1 keybinding (ADR-0053)** end to end (Phases A–D). The CI
+branch was also merged into `main` mid-session (not my work — see §5).
+
+Net: **2 feature areas shipped, 1 new ADR (0053) + 1 ADR amendment
+(0052), 4 new Gitea issues (#35–#38), the `hint` corpus (~57 teaching
+blocks), and A1 + H2 closed in `requirements.md`.**
+
+## §1. State at handoff
+
+**Branch:** `main`. Working tree **clean**; all work committed. Commits
+are local (push is the user's step).
+
+**Tests: 2499 passing / 0 failing / 0 skipped / 1 ignored** (the
+long-standing `friendly` doctest). **Clippy clean** (nursery, all
+targets). Breakdown: 1799 lib + 500 `it` + 200 typing-surface-matrix.
+
+**Open Gitea issues (4, all enhancement, all filed this session):**
+- **#35** — enforce `cargo fmt` across the codebase (single reformat +
+  CI gate). The tree is *not* fmt-clean (~1800 pre-existing diffs); do it
+  once, coordinated with CI, before first publication.
+- **#36** — `help` collapses advanced-SQL forms onto their simple sibling
+  (a `help`-list dedup artifact); they deserve distinct help content.
+- **#37** — `hint` clause-concept hints (`on delete` actions, constraint
+  slots, `with pk`, cardinality) — a deferred `hint.concept.<topic>`
+  layer.
+- **#38** — `hint` pre-submit-diagnostic route + the ~33 `diagnostic.*`
+  tier-3 blocks (deferred; `Diagnostic` carries no class key).
+
+## §2. ADR-0052 follow-up — vestigial worker `source` unwind (`e8fa859`)
+
+The first task from handoff-69 §3. ADR-0052 moved success-journaling out
+of the worker, leaving the `source` that handlers threaded purely for the
+old `history.log` write dead. **Bigger than the handoff estimated** (it
+framed it as ~28 call-site edits): the cascade ran through ~30 worker
+handlers + the `DescribeTable`/`QueryData`/`RunSelect` request fields +
+their `DatabaseHandle` methods (~164 mostly-test call sites). Fully
+unwound, compiler-guided, **no behaviour change** (journaling uses a
+`source_for_journal` clone at the spawn, independent of the worker). The
+only worker `source` left is the snapshot/undo label. Amended ADR-0052
+*Consequences* + README. (Two scope forks escalated + user-approved.)
+
+## §3. H2 — contextual `hint` (ADR-0053), Phases A–D — **shipped**
+
+The bulk of the session. ADR-0053 settles the `hint` slot ADR-0003 left
+"ADR pending"; **closes A1** (all 15 app commands now exist) and
+**requirements H2**. Read ADR-0053 before touching this area — it went
+through three revisions and several user decisions.
+
+### The design (all user-chosen)
+- **Two surfaces:** an **F1 keybinding** → tier-3 hint for the *live*
+  partial input (read-only overlay — never touches buffer/cursor/memo);
+  a submitted **`hint` command** → expands on the *most recent runtime
+  error*. No topic arg (contextual only; `help <topic>` owns reference).
+- **Tier-3 teaching layer** beneath the existing tier-1 (colour / error
+  headline) and tier-2 (ambient one-liner; the error `hint:` shown **by
+  default** since `Verbosity::Verbose` is the default). Each block is
+  `what` / `example` / `concept`, rendered as a `Hint` heading + aligned
+  labels.
+- **Per-form keying** (Phase-B revision — the original per-node `hint_id`
+  was too coarse for multi-form commands like `add`/`drop`/`show`): a new
+  **`hint_ids: &[&str]`** field on `CommandNode` mirroring `usage_ids`,
+  resolved by `hint_key_for_input_in_mode` (reuses `usage_key`'s
+  form-word disambiguation + a mode-primary fallback for shared entry
+  words so advanced `insert` → `sql_insert`, simple → `insert`).
+- **Comprehensive for v1 = command forms + 9 runtime error classes**
+  (the ~33 `diagnostic.*` classes were **deferred**, #38 — see §4).
+
+### Key files
+- `src/dsl/command.rs` — `AppCommand::Hint`.
+- `src/dsl/grammar/app.rs` — `HINT` node + `build_hint`.
+- `src/dsl/grammar/mod.rs` — the `hint_ids` field, `hint_key_for_input_in_mode`,
+  the factored `pick_form_key`, and the two **comprehensiveness coverage
+  tests** (every node has a resolving `hint.cmd.*`; every runtime error
+  class has a `hint.err.*`).
+- `src/app.rs` — F1 arm in `handle_key` (read-only overlay, placed before
+  the completion-memo clear); `note_hint_for_input` / `note_hint_for_recent_error`
+  / `note_getting_started` / `emit_tier3_block`; `last_error_hint_key`
+  state (set in `handle_dsl_failure`, cleared in `submit` for DSL
+  commands).
+- `src/friendly/translate.rs` — `error_hint_class` (maps a `DbError` +
+  ctx to its `hint.err.<class>`; mirrors `translate`'s dispatch — keep in
+  sync, unit-tested).
+- `src/friendly/strings/en-US.yaml` + `keys.rs` — the corpus under
+  `hint.cmd.<form>` / `hint.err.<class>` + `hint.block.*` labels +
+  `shortcut.hint`.
+- `src/ui.rs` — ADR-0051 strip advertises **F1** (editing + default
+  states); 12 full-panel snapshots re-accepted.
+
+### Phases (one commit each unless noted)
+- **A** (`050b363`) skeleton + tier-2 fallback; **B** (`4a5fd1b`) per-form
+  keying + 3 exemplars; **C** content in 5 batches (`4bdfce6` app,
+  `6429b56` DDL, `9c4d520` DML, `97970f2` advanced-SQL, `b6b98ad` runtime
+  errors) + `417cbc8` diagnostic deferral; **D** (`447112b`) coverage gate
+  + F1 strip + status flips; **/runda fix** (`329adfc`) — see §3.1.
+
+### 3.1 — what the final `/runda` caught (don't skip)
+Per-batch substring tests masked a **presentation gap**: `emit_tier3_block`
+was emitting three *bare, unlabelled* lines, deviating from the approved
+exemplar format. Fixed to render a `Hint` heading + aligned `What:` /
+`Example:` / `Concept:` lines, **locked by an `insta` snapshot**
+(`hint_block_insert`). Also confirmed the `Next:` line (ADR D2 exemplar)
+is correctly **omitted** — tier-2 ambient already owns live
+position-awareness. Lesson for the next content/UI work: **add a rendered
+snapshot early**; substring asserts don't see layout.
+
+## §4. Deferrals (all tracked, all user-confirmed)
+
+- **#38 diagnostic route + `diagnostic.*` blocks** — `Diagnostic`
+  (`walker/outcome.rs`) carries only its rendered `message`, not a class
+  key, so the F1 diagnostic route would need a `class` field threaded
+  through every diagnostic site (broad) for marginal value (tier-2
+  already surfaces diagnostics; many duplicate runtime classes). F1 still
+  shows the useful command block when a diagnostic is present.
+- **#37 clause-concept hints** — per-form is the right tier-3 granularity;
+  clause-level concepts are a separate `hint.concept.<topic>` layer for
+  later.
+- **#36 `help` advanced-SQL** — out of H2's scope (touches shipped `help`).
+
+## §5. CI branch merged into `main` (not my work)
+
+Mid-session the **`ci` branch was merged** (commits `47a0816`, `138e766`
++ the `ci:`/`build:`/`docs(ci):` commits). `main` now carries a CI
+pipeline, a nix flake, and **D1 cross-platform release builds** (matrix +
+macOS), documented under a **new `docs/ci/adr/` namespace** (ci-001..003).
+Implications for the roadmap: **D1 (cross-platform binaries) is now
+substantially underway** — re-assess D1/D2/D3 status against what landed
+before treating them as open. My H2 work is layered cleanly on top (all
+green post-merge).
+
+## §6. Next session — start here
+
+1. **Push** (user step) — 30-odd local commits incl. the CI merge + all
+   of H2.
+2. **Re-baseline the roadmap** against the merged CI work: D1/D2/D3 and
+   **TT5 CI** are partly/largely done now — read `docs/ci/adr/` and the
+   workflows before assuming they're open (handoff-69 §5 predates this).
+3. **#35 (cargo fmt gate)** is the natural pairing with the now-merged CI
+   — the user wanted it done once, before first publication.
+4. Other `requirements.md` open items (verify against CI merge first):
+   **TT4** PTY tier-4 (still unwired), **I1** multi-line input, **I5/B3**
+   in-flight cancellation, **V4** session journal (own ADR), **TU1**
+   tutorial system (own ADR). H2/A1 are now **done**.
+5. The H2 deferrals (#36/#37/#38) are available if the user wants to
+   round out the hint/help surface.
+
+## §7. How to take over
+
+1. Read handoffs 68 → 69 → 70, `CLAUDE.md`, `docs/requirements.md`.
+2. Confirm green: `cargo test` (expect **2499 pass / 1 ignored**) +
+   `cargo clippy --all-targets` (clean).
+3. Read `docs/ci/adr/` (the merged CI work) before touching CI/release/D*.
+4. For anything in the `hint` area, read **ADR-0053** first (3 revisions
+   + deferrals #37/#38). For journaling, ADR-0052 (+ its 2026-06-14
+   follow-up note).
+5. Project workflow unchanged: phased, test-first, `/runda` + DA before
+   commits, ADR amendment + README index-upkeep for decided-area changes,
+   confirm commit messages with the user.
+6. Consider a `cargo sweep` at this milestone (`target/` grows; see
+   CLAUDE.md "Build hygiene").

docs/handoff/20260615-handoff-71.md

@@ -0,0 +1,120 @@
+# Session handoff — 2026-06-15 (71)
+
+Short, focused handover. Continues immediately from handoff-70 (which
+shipped H2 / the contextual `hint`, ADR-0053). **A user smoke-test
+surfaced a correctness bug in the hint content, and it implicates the
+whole corpus.** This handoff exists so the next session does a
+**systematic semantic verification pass over every hint block** — context
+ran too low to do it now.
+
+## §1. State
+
+**Branch:** `main`, clean, all committed (local; push pending). **2499
+pass / 1 ignored, clippy clean.** Open issues: #35–#38 (see handoff-70).
+H2 / ADR-0053 is *functionally* complete; the **content is not
+trustworthy** until the pass below is done.
+
+## §2. The bug (confirmed)
+
+`hint.cmd.create_table` (in `src/friendly/strings/en-US.yaml`) reads:
+
+```
+What:    Create a new table — its columns, their types, and a primary key.
+Example: create table Customers with pk id(serial), name(text), email(text)
+Concept: A table is a set of rows that share the same columns. The primary
+         key uniquely identifies each row; a `serial` key numbers the rows for you.
+```
+
+**This is wrong.** In the DSL, **everything after `with pk` is the
+primary-key column list** (a possibly *compound* PK, ADR-0005). So the
+example does **not** create a table with `pk=id` plus regular columns
+`name`/`email` — it creates a table whose **compound primary key is
+(id, name, email)**. Non-key columns are added *separately* with
+`add column`. The `what` ("its columns, their types") and the example
+both mislead a learner badly.
+
+- **Evidence:** real test usage is `create table Orders with pk
+  id(serial), CustId(int)` (a 2-column *compound PK*) and the common form
+  `create table X with pk id(int)` (single-column PK only). The usage
+  template `create table <Name> with pk [<col>(<type>)[, ...]]` is itself
+  misleading — the `[, ...]` is the PK list, not regular columns.
+- **Correct mental model:** `create table <T> with pk <pk-cols…>` then
+  `add column <T>: <name> (<type>)` for each non-key column. Confirm
+  against ADR-0005 (compound PK) and ADR-0009 (DSL syntax) when fixing.
+
+## §3. Root cause — why this needs a *full* pass
+
+During Phase C I verified *some* examples against `parse.usage.*`
+templates and real test greps, but for others I **extrapolated** beyond
+verified syntax. For `create_table` I saw `... with pk id(int)` (single
+col) and wrongly generalised to "pk + more columns," misreading the
+`with pk` list as a column list. The examples are **syntactically**
+checked but not **semantically** — i.e. not verified to *do what the
+`what`/`concept` claims*.
+
+So the corpus needs a pass that, for **every** `hint.cmd.*` and
+`hint.err.*` block, checks:
+1. the `example` parses **and runs**, and
+2. it actually demonstrates what `what`/`concept` says, and
+3. `what`/`concept` are factually true of the real behaviour.
+
+**Don't trust grep+extrapolation.** Prefer: run the example in the app
+(or a Tier-3 test), or check it against the authoritative ADR.
+
+## §4. The pass — how to do it (next session)
+
+The corpus lives in `src/friendly/strings/en-US.yaml` under `hint.cmd.*`
+(per command form) and `hint.err.*` (per runtime error class). The
+inventory and authoritative syntax sources:
+
+- **`hint.cmd.<form>`** — for each, cross-check the example against the
+  matching `parse.usage.<form>` template **and** the form's ADR, and run
+  it. Highest-risk (extrapolated, verify first): **DDL** — `create_table`
+  (known wrong), `add_column`, `add_index`, `add_constraint`,
+  `change_column`, `drop_*`, `create_m2n`; **advanced-SQL** — confirm
+  each is in the supported SQL subset (`select`, `with` CTE,
+  `sql_insert/update/delete`, `sql_create_table`, `sql_alter_table`,
+  `sql_create_index/drop_index/drop_table`, `explain_sql`); **DML** —
+  `seed` forms, `explain`, `show_*`, `update`/`delete` (`--all-rows` /
+  required-WHERE wording). App commands are lower-risk (reference-style).
+- **`hint.err.<class>`** — verify the fix recipe in `example` is actually
+  the right remedy and `concept` matches the engine's real behaviour
+  (FK sides, `on delete` actions, check/not_null/unique semantics).
+- Relevant ADRs: 0005 (types + compound PK), 0009 (DSL syntax), 0011 (FK
+  type compat), 0013 (relationships/rebuild), 0014 (data ops +
+  required-WHERE), 0025 (indexes), 0028/0039 (explain), 0030–0036 (SQL
+  subset), 0048 (seed). `docs/requirements.md` for scope.
+
+**Suggested method:** drive the app (`/run` or a small PTY/Tier-3 harness)
+and actually execute each example; or add a test that parses+runs every
+`hint.cmd.*` example and asserts success. The latter would also be a
+durable regression guard — consider adding it as part of the pass (it
+upgrades the comprehensiveness coverage test from "a block exists" to
+"the example actually works").
+
+## §5. Immediate fix ready to apply
+
+`create_table` is diagnosed (§2). The corrected block should make the
+example a PK-only `create table` and move the regular columns to a
+follow-up `add column`, e.g.:
+
+```
+What:    Create a new table with its primary key.
+Example: create table Customers with pk id(serial)
+Concept: A table is a set of rows sharing the same columns. `with pk`
+         declares the primary key (one column, or several for a compound
+         key); add the other columns afterwards with `add column`.
+```
+
+Apply this (and re-check `create_m2n` / `add_*` while there), but only as
+part of the systematic pass — a one-off fix risks leaving siblings wrong.
+
+## §6. How to take over
+
+1. Read handoffs 70 → 71, `CLAUDE.md`.
+2. Confirm green: `cargo test` (2499 / 1 ignored), `cargo clippy
+   --all-targets`.
+3. Do the §4 pass (consider the run-every-example test in §4). Test-first,
+   `/runda` before commit, confirm the commit message with the user.
+4. Pedagogy wins — these are teaching strings; correctness and clarity
+   over cleverness.

docs/handoff/20260615-handoff-72.md

@@ -0,0 +1,113 @@
+# Session handoff — 2026-06-15 (72)
+
+Short, focused handover. Continues from handoff-71, which asked the next
+session to run a **systematic semantic verification pass over every
+`hint` block** (handoff-70 shipped H2 / ADR-0053, but a user smoke-test
+found a wrong hint and implicated the whole corpus). **That pass is now
+done.** Four content errors fixed, a durable parse-guard added, two stale
+docs corrected. Commit `5a37437`.
+
+## §1. State
+
+**Branch:** `main`, clean, all committed (local; **push pending** — your
+step). **2500 pass / 0 fail / 1 ignored** (the long-standing `friendly`
+doctest), **clippy clean** (nursery, all targets). The +1 vs handoff-71's
+2499 is the new guard test. Open Gitea issues unchanged: **#35–#38**.
+
+## §2. The verification pass (commit `5a37437`)
+
+Method: cross-checked every `hint.cmd.*` example against its
+`parse.usage.*` template, ground-truthed every concept claim against the
+authoritative ADR **and a named existing test** (not grep+extrapolation —
+the trap handoff-71 §3 warned about), and parse-validated all 49 command
+examples via a new guard.
+
+### Four content errors fixed (`src/friendly/strings/en-US.yaml`)
+
+| Block | Bug | Fix |
+|---|---|---|
+| `cmd.create_table` | Example `with pk id(serial), name(text), email(text)` declares a **3-column compound PK**, not a PK + regular columns. Every `with pk` column is a key member — confirmed by the grammar test comment *"Every `create table` column is a primary-key column"* (`ddl.rs`), ADR-0005. | Single-column PK + `add column` for the rest; `what`/`concept` aligned. |
+| `cmd.save` | `save as my-shop` **does not parse** — `build_save` yields `AppCommand::SaveAs` with **no inline name**; `save as` opens a path-entry modal (`iteration4b` tests). | Example → `save as`; `what` de-implied; added an accurate temp-vs-named-auto-save `concept`. |
+| `cmd.import` | Target `shop-copy` **does not parse** — the `as <target>` slot is an `IdentSource::NewName` ident that tokenises only up to the hyphen. (The zip path is a BarePath and *does* accept hyphens, hence `export my-shop.zip` is fine.) | → `shop_copy`. |
+| `err.foreign_key.child_side.concept` | Offered `on delete set null/cascade` as the remedy — but `error_hint_class` maps child_side to **insert/update** violations; `on delete` governs the **parent** direction. The tier-1 hint (line 64) correctly omits it. | Corrected: parent must exist first; clarified `on delete` is the *other* direction. |
+
+### Durable guard added
+
+`every_cmd_hint_example_parses_in_its_mode` (`src/dsl/grammar/mod.rs`,
+in the `hint_key_tests` module). **Catalog-driven** — it iterates
+`catalog().keys()` for `hint.cmd.*.example` rather than the REGISTRY, so
+an orphaned/mis-keyed block can't slip past; floor-asserts ≥49 examples.
+Each parses in its taught mode (advanced for the SQL surface, simple
+otherwise). It caught the `save` and `import` errors **test-first** (red
+before the YAML fix). Registered the new `hint.cmd.save.concept` key in
+`keys.rs` (the `keys_validate_against_catalog` test requires every catalog
+key be declared).
+
+### Verified correct (not changed)
+
+All other `cmd`/`err` blocks. Notably the guard-*concept* claims were each
+confirmed against a named runtime test, not assumed:
+`drop_column_refuses_primary_key` / `…_column_in_a_relationship`,
+`drop_table_with_inbound_relationship_errors`,
+`add_not_null_column_without_default_to_populated_table_is_refused`. The
+corrected `create_table` story stays coherent with the `Customers`-
+referencing examples (id serial PK → `add column` name/email → `insert`
+skips the auto id).
+
+## §3. Docs corrected (same commit)
+
+Discovered while verifying `create_m2n` (which **is** implemented —
+`db.rs::do_create_m2n_relationship` + `tests/it/m2n.rs`):
+
+- **CLAUDE.md** carried two **stale "deferred" claims**, both already
+  implemented. Removed/updated: (a) the at-a-glance project-format line
+  said export/import (Iter 5) + `--resume`/input-history/migration (Iter
+  6) were "pending" — all `[x]` in `requirements.md` (ADR-0015); (b) the
+  "Things deliberately deferred" list still had the **m:n convenience
+  (C4)** bullet and the same project-storage bullet. `requirements.md`
+  was already correct (C4 done 2026-06-10, ADR-0045), so only a
+  verification-pass note was appended to its **H2** entry.
+
+## §4. Scope note — what the guard does *not* do
+
+The bug class here is **semantic** (an example that parses and runs but
+misrepresents the prose — e.g. `create_table`). The guard enforces only
+the **syntactic floor**: examples parse in their mode. It backstops
+future typos/clause-drift but cannot police meaning. Semantic correctness
+of the current corpus rests on this session's review (recorded in the
+commit + requirements.md H2). A stronger-but-brittler option was offered
+to the user and **not built pending their call**: per-form assertions
+that each example resolves to the *expected command shape* (e.g.
+create_table → single-column PK). `hint.err.*` examples are fix-recipe
+prose, not runnable, so they're verified by review only — inherent.
+
+## §5. Next session — start here
+
+The hint corpus is now trustworthy. Open roadmap (verify against the CI
+merge first, per handoff-70 §5):
+
+1. **Push** (your step) — this commit + the still-unpushed backlog from
+   handoffs 70/71 (the CI merge + all of H2).
+2. **#35 (cargo fmt gate)** — the natural pairing with the merged CI; the
+   user wanted it done once, before first publication. The tree is **not**
+   fmt-clean (~1800 pre-existing diffs).
+3. Other `requirements.md` open items: **TT4** PTY tier-4 (unwired),
+   **I1** multi-line input, **I5/B3** in-flight cancellation, **V4**
+   session journal (own ADR), **TU1** tutorial system (own ADR).
+4. Hint follow-ups if wanted: **#37** clause-concept hints, **#38**
+   diagnostic route + `diagnostic.*` blocks, **#36** `help` advanced-SQL.
+
+## §6. How to take over
+
+1. Read handoffs 70 → 71 → 72, `CLAUDE.md`, `docs/requirements.md`.
+2. Confirm green: `cargo test` (**2500 / 1 ignored**) + `cargo clippy
+   --all-targets` (clean).
+3. For anything in the `hint` area, read **ADR-0053** first. For the
+   corpus, `src/friendly/strings/en-US.yaml` (`hint.cmd.*` / `hint.err.*`)
+   is the content; the guard in `src/dsl/grammar/mod.rs` is the regression
+   net.
+4. Workflow unchanged: phased, test-first, `/runda` + DA before commits,
+   ADR amendment + README index-upkeep for decided-area changes, confirm
+   commit messages with the user.
+5. Consider a `cargo sweep` at this milestone (`target/` grows; see
+   CLAUDE.md "Build hygiene").

docs/handoff/20260616-handoff-73.md

@@ -0,0 +1,112 @@
+# Session handoff — 2026-06-16 (73)
+
+Short, focused handover. Continues from handoff-72 (which completed the
+H2 hint-corpus verification pass). This session shipped one small
+feature — a **`Ctrl-G` demo-mode alias for F1** — plus follow-on doc
+hygiene. Commit `4016c3e`.
+
+## §1. State
+
+**Branch:** `main`, clean, all committed (local; **push pending** — your
+step; the backlog now spans the CI merge, H2, the hint-corpus fixes,
+handoffs 71/72/73, and this Ctrl-G commit). **2503 pass / 0 fail / 1
+ignored** (the long-standing `friendly` doctest), **clippy clean**
+(nursery, all targets). Open Gitea issues unchanged: **#35–#38**.
+
+## §2. Why Ctrl-G (the problem)
+
+Casts are recorded with **`autocast`** (ADR-0047 demo mode: `--demo` /
+`RDBMS_PLAYGROUND_DEMO`). The contextual hint overlay (ADR-0053 / H2)
+opens on **F1** — but F1 reaches the app only as a terminal **escape
+sequence** (`\eOP` / `\e[11~`), and **autocast cannot emit escape
+sequences**. So the single most teaching-relevant overlay was
+unreachable in recordings (and in presenter/teacher sessions, which also
+run `--demo`). Same wall that pushed step-captions onto `Ctrl+]` (a
+single control byte) rather than `Ctrl+!`.
+
+### Chord choice — why Ctrl-G, why not Ctrl-1
+
+The user's first instinct was `Ctrl-1` (mnemonic, near F1). **Not
+possible:** in a legacy terminal `Ctrl`+digit has no control byte —
+`Ctrl-1` arrives as a bare `1` (would type "1" into the buffer). The
+kitty keyboard protocol *would* encode it, but only as an escape
+sequence (the very thing autocast can't send), and this app deliberately
+does **not** push `KeyboardEnhancementFlags` (`runtime.rs` does only
+`enable_raw_mode` + `EnterAlternateScreen`). So the usable space is
+exactly **`Ctrl`+letter** (single legacy control bytes). After excluding
+taken chords (`Ctrl-C` quit, `Ctrl-O` nav, `Ctrl+]` caption,
+`Ctrl-A/E/W/K/U` readline per ADR-0049), byte-collisions
+(`Ctrl-H/I/J/M/[`), flow-control (`Ctrl-S/Q`), and likely-future
+(`Ctrl-R/P/N/Y/L/V`), **`Ctrl-G`** is the clean survivor (BEL/"abort" in
+line editors — nothing destructive to shadow).
+
+## §3. What shipped (commit `4016c3e`)
+
+ADR-0047 **Amendment 1**. **In demo mode only**, `Ctrl-G` aliases F1:
+
+- Runs the *exact* F1 hint logic (`hint_key` guard in
+  `App::handle_key`, `src/app.rs` ~line 1226 — `key.code == F(1) ||
+  (self.demo_mode && Ctrl-G)`), so live-input → form hint, empty input →
+  recent-error / getting-started.
+- **Badges as `[F1]`** (not `[CTRL-G]`): `demo_badge_label` maps
+  `Ctrl-G → Some("[F1]")` (consulted only in demo mode — the caller
+  gates). So a recorded cast is **visually identical to a real F1
+  press**.
+- **Demo-gated:** the shipped keymap stays F1-only. Outside demo mode
+  `Ctrl-G` falls through to the inert catch-all (the `Char(c)` insert arm
+  excludes CONTROL, so no `g` is typed).
+- The keybinding strip (ADR-0051) is **not** changed — F1 stays the
+  advertised key; `Ctrl-G` is a recorder aid and the badge already reads
+  `[F1]`.
+
+**Tests (test-first, `src/app.rs` Tier-1):** `ctrl_g_in_demo_mode_-
+aliases_f1_on_input`, `…_on_empty_input`, `ctrl_g_outside_demo_mode_-
+is_inert`, plus a `Ctrl-G → [F1]` assertion added to
+`demo_badge_label_maps_the_invisible_keys`. All confirmed red→green; the
+"inert" test passed on the pre-change code, proving the demo-gate.
+
+### Using it in a cast
+With `--demo` active, send **`Ctrl-G`** in the autocast script wherever
+you want the hint overlay to appear; the viewer sees the `[F1]` badge.
+
+## §4. Doc hygiene done alongside (same commit)
+
+- **ADR-0047 file:** removed two stray `</content>` / `</invoke>` lines
+  (tool-call residue accidentally committed when the ADR was authored).
+- **CLAUDE.md "Things deliberately deferred":** dropped three **stale**
+  entries — **I1b** readline shortcuts (done, ADR-0049), **I3** tab
+  completion, and **I4** syntax highlighting (both done; requirements.md
+  even carries a 2026-06-07 reconciliation note that I3/I4 were
+  "shipped but marked not yet"). Only **I1** (multi-line input) remains —
+  it is genuinely still open (`[ ]` in requirements.md). *(This follows
+  the handoff-72 cleanup that removed the equally-stale m:n/C4 +
+  project-storage entries.)*
+
+## §5. Open / next (unchanged from handoff-72 §5)
+
+The hint corpus is trustworthy and the cast-F1 gap is closed. Roadmap:
+
+1. **Push** (your step).
+2. **#35 (cargo fmt gate)** — precondition (CI merged) is met; the user
+   wants it done once, before first publication. Needs a `rustfmt.toml`-
+   vs-defaults decision first; tree is ~1800 hunks dirty.
+3. Other open `requirements.md` items: **I1** multi-line input, **I5/B3**
+   in-flight cancellation, **TT4** PTY tier-4 (unwired), **DOC1**/**E2**
+   user docs (partial), **TT5** Windows-execution + Tier-4-in-CI, **D3**
+   packaging manifests. Design-first (`[~]`): **V4** session journal,
+   **TU1** tutorial, **C3a**, **V3**.
+4. Hint follow-ups if wanted: **#36** `help` advanced-SQL, **#37** hint
+   clause-concepts, **#38** hint diagnostic route.
+
+## §6. How to take over
+
+1. Read handoffs 71 → 72 → 73, `CLAUDE.md`, `docs/requirements.md`.
+2. Confirm green: `cargo test` (**2503 / 1 ignored**) + `cargo clippy
+   --all-targets` (clean).
+3. For demo-mode / casting, read **ADR-0047** (+ its Amendment 1); for
+   the hint overlay it aliases, **ADR-0053**.
+4. Workflow unchanged: phased, test-first, `/runda` + DA before commits,
+   ADR amendment + README index-upkeep for decided-area changes, confirm
+   commit messages with the user.
+5. Consider a `cargo sweep` at this milestone (`target/` grows; see
+   CLAUDE.md "Build hygiene").

docs/handoff/20260618-handoff-74.md

@@ -0,0 +1,137 @@
+# Session handoff — 2026-06-18 (74)
+
+Large session. Continues from handoff-73 (Ctrl-G demo alias). This one ran
+the **road to public availability** end to end: a post-merge doc
+reconciliation, then versioning, installers, crates.io/binstall, the
+`cargo fmt` gate, and an actual **`v0.2.0` release that is now live on
+crates.io**. Three new main-sequence ADRs (0054/0055/0056), one CI-ADR
+amendment, issue **#35 closed**.
+
+## §1. State
+
+**Branch `main`.** **2509 pass / 0 fail / 1 ignored** (the long-standing
+`friendly` doctest); **clippy clean**; **`cargo fmt --check` clean** (the
+tree is now stock-rustfmt formatted, and CI gates it). `rdbms-playground
+--version` → `rdbms-playground 0.2.0`.
+
+**Released:** **`v0.2.0`** — Gitea release with all six D1 targets
+(Linux/Windows via `release.yaml` on the tag; macOS via the dispatched
+`release-macos.yaml`, **ad-hoc-signed**). **Published to crates.io**
+(`cargo install rdbms-playground` and `cargo binstall rdbms-playground`
+both user-verified).
+
+**Push state:** earlier commits were pushed (they triggered CI/releases).
+The **most recent commits are unpushed** and matter:
+- `3c87dbb` macOS nix-prune fix (takes effect next macOS dispatch).
+- `d3af1c4` + `8ebe213` the manual `publish.yaml` workflow — ADR-0056 in
+  the first, the **workflow file itself in the second** (`git commit -am`
+  had skipped the new untracked file).
+- this handoff.
+Push `main` to land them. (Push is the user's step.)
+
+## §2. What shipped (commits `628b250`→`d3af1c4`)
+
+- **`628b250` doc reconciliation** after the CI + website branch merges:
+  rewrote CLAUDE.md's stale repo-layout tree; added a Website subproject
+  note; fixed the CI note; **gitignored `.wrangler/` + `.vscode/`** and
+  removed a tracked `website/.vscode/`; updated requirements (D1 macOS
+  runtime-verified, DOC1 canonical-docs-on-website) + ADR-ci-003.
+- **`c30a611` ADR-0054 — version surfaces.** `--version`/`-V` + an in-app
+  **`version`** command, both reading `CARGO_PKG_VERSION` via one
+  `cli::version_text()`. A **release-CI guard** fails the release unless
+  the `v*` tag equals `v<Cargo.toml version>`.
+- **`ef99e6c` ADR-0055 — `scripts/install.sh`** (curl|sh, POSIX,
+  shellcheck-clean, checksum-verified, `~/.local/bin`). Verified
+  end-to-end against the live release. **`install.ps1`** (Windows
+  `irm|iex`) added later (`e9606b5`) — **written but untested here** (no
+  PowerShell on this box; validate on Windows).
+- **`e9606b5` ADR-0056 — crates.io + binstall prep.** Publish-ready
+  Cargo.toml (dropped `publish=false`; homepage/keywords/categories/
+  `exclude`); `README.md`; `LICENSE-MIT`/`LICENSE-APACHE` (dual, © Lazy
+  Evaluation Ltd) + `CONTRIBUTING.md` (inbound=outbound); the
+  `[package.metadata.binstall]` block with per-target overrides
+  (linux-gnu→musl, windows-msvc→gnu/gnullvm; macOS direct).
+- **`41b7e9a` + `ec3c7c3` — #35 fmt gate.** One mechanical `cargo fmt`
+  (stock defaults, 102 files, behaviour-preserving) recorded in
+  `.git-blame-ignore-revs`; `ci.yaml` now gates `fmt --check` (ADR-ci-002
+  Amendment 1). **Closes #35.**
+- **`88830ed`+`bd5be5e` — v0.2.0 bump + the guard bug.** The first
+  `release.yaml` run **failed** at the version guard: it piped `nix
+  develop -c cargo metadata` to node, but the **flake devShell prints a
+  banner to stdout**, corrupting the JSON. Fixed to a toolchain-free
+  `grep -m1 '^version = ' Cargo.toml`. The `v0.2.0` tag was re-pointed
+  (Option A) to the fix commit; re-run went green.
+- **`3c87dbb` — macOS nix-prune fix.** The prune step's profile dir
+  (`~/.cache/rdbms-ci`) didn't exist, so `nix develop --profile` errored
+  (swallowed by `|| true`) → the gc-root was never created → the whole
+  toolchain (~3.8 GiB) was deleted **and re-downloaded every run**. Added
+  `mkdir -p` + dropped the `|| true`. Diagnosed from the run-74 log via
+  `tea actions runs logs 74`.
+- **`d3af1c4` — manual `publish.yaml`.** `workflow_dispatch` + `tag`
+  input (mirrors `release-macos.yaml`). Idempotent `crates-io` job
+  (crates.io API pre-check + `cargo publish` backstop), independent jobs
+  so Scoop/Homebrew/winget slot in later. ADR-0056 Amendment 1.
+
+## §3. Live vs manual vs parked
+
+- **Automated on a `v*` tag:** `release.yaml` builds + publishes the four
+  Linux/Windows targets (+ fmt/clippy/test gate).
+- **Manual `workflow_dispatch`:** `release-macos.yaml` (mac binaries —
+  intermittent runner) and `publish.yaml` (crates.io now; more registries
+  later). Run them once the tag's build is up.
+- **Parked (user decisions):**
+  - **macOS Developer-ID signing.** The pipeline **ad-hoc-signs**
+    (`codesign --sign -`). The user's `Apple Development` cert is the
+    **wrong type** — distribution needs **`Developer ID Application`** +
+    **notarization** (App Store Connect API key recommended). Fine for
+    `curl|sh` (no quarantine); matters for browser downloads. Details in
+    `docs/plans/20260616-public-availability.md`.
+  - **Remaining D3:** Scoop (`lazyeval` bucket), Homebrew (`lazyeval`
+    tap), winget (komac on Linux CI, or manual PR) — each a sibling job
+    in `publish.yaml` + a manifest repo.
+
+## §4. Immediate next steps
+
+1. **Push `main`** (lands `3c87dbb` + `d3af1c4`).
+2. **Add the `CARGO_REGISTRY_TOKEN` secret** (crate-scoped,
+   `publish-update`) so `publish.yaml` works: `tea actions secrets create
+   CARGO_REGISTRY_TOKEN` (paste at prompt) or the Gitea UI.
+3. **Smoke-test `publish.yaml`:** dispatch it for `v0.2.0` — it should
+   **idempotently skip** ("already on crates.io"), exercising the path
+   risk-free.
+4. The release ritual going forward (ADR-0054): bump `Cargo.toml` →
+   commit → tag `v<x.y.z>` → push tag (Linux/Windows release builds) →
+   dispatch `release-macos` → dispatch `publish`.
+
+## §5. Gotchas learned (don't relearn the hard way)
+
+- **The flake devShell prints a banner to stdout** — never pipe `nix
+  develop -c <cmd>` into a parser. Read Cargo.toml directly, etc.
+- **Workflow-file source differs by trigger:** a **tag**-triggered run
+  (`release.yaml`) uses the workflow **at the tagged commit**; a
+  **`workflow_dispatch`** run (`release-macos`/`publish`) uses the
+  **default branch** (`main`). So fixing a dispatched workflow only needs
+  a `main` push; fixing a tag-triggered one needs the tag re-pointed.
+- **Version vs tag:** `Cargo.toml` is bare `0.2.0`; the git tag is
+  `v0.2.0`; the guard checks `tag == "v" + version`; binstall `pkg-url`
+  spells `v{ version }`.
+- **CI logs are reachable** via `tea actions runs logs <id>` (and `tea
+  actions runs list --output tsv`). Use it instead of guessing from a
+  step name.
+- **crates.io API needs a descriptive User-Agent** (403 without one).
+
+## §6. How to take over
+
+1. Read handoffs 72 → 73 → 74, `CLAUDE.md`, `docs/requirements.md`, and
+   **`docs/plans/20260616-public-availability.md`** (the GA roadmap with
+   all decisions + parked items).
+2. Confirm green: `cargo test` (**2509 / 1 ignored**), `cargo clippy
+   --all-targets`, `cargo fmt --check`.
+3. ADRs for this arc: **0054** (versioning), **0055** (installer),
+   **0056** (crates.io/binstall + the publish workflow); CI side
+   **ADR-ci-002 Amendment 1** (fmt gate), **ADR-ci-003** (release matrix
+   + macOS).
+4. Workflow unchanged: phased, test-first, `/runda` + DA before commits,
+   ADR amendment + README index-upkeep for decided-area changes, confirm
+   commit messages, never push.
+5. Consider a `cargo sweep` at this milestone (`target/` grows).

docs/plans/20260614-adr-0053-contextual-hint-H2.md

@@ -0,0 +1,243 @@
+# Plan — ADR-0053: contextual `hint` command + F1 keybinding (H2)
+
+Implements ADR-0053. Closes the last open piece of **A1** (the canonical
+app-command set) and requirements **H2**. No Gitea issue — this is
+requirements-driven work; any genuine "later" item found en route gets
+its own issue (cf. #36, already filed for the parallel `help`-side gap).
+
+## 1. Goal
+
+Give learners on-demand, **teaching-grade** contextual help — a *third*
+tier beneath the existing terse always-on text (tier 1) and the
+short contextual lines that are already shown (tier 2: the live ambient
+prose, and the error `hint:` which is on by default since
+`Verbosity::Verbose` is the default). Two surfaces:
+
+- **F1** (read-only overlay) → a tier-3 block for the **live partial
+  input**, or — on empty input — for the **most recent runtime error**.
+- **`hint`** (submitted app command) → the tier-3 block for the **most
+  recent runtime error** (the buffer is empty post-submit, so it can only
+  act on recent context).
+
+The mechanism is small; the **content corpus is the feature** (~80
+blocks, comprehensive for v1, authored exemplars-first per ADR-0053 D7).
+
+## 2. The shape of the work (why this order)
+
+The mechanism and the content are separable, and the mechanism should
+land first with **graceful tier-2 fallback** so every surface works
+before any tier-3 text exists. That lets us:
+
+- build + test the trigger matrix / routing / `:`-strip / read-only-
+  overlay behaviour against a skeleton (TDD), then
+- pour in content in reviewable batches without re-touching the wiring,
+- and turn on the **comprehensiveness coverage test** only once the
+  corpus is complete (it is red until then — by design).
+
+Build order: **Phase A** (mechanism skeleton, falls back to tier-2) →
+**Phase B** (catalogue structure + the three approved exemplars) →
+**Phase C** (comprehensive content, batched) → **Phase D** (polish:
+strip advertisement, snapshots, full green).
+
+## 3. Grammar: the `hint_ids` field + the `HINT` node
+
+### 3a. New `CommandNode.hint_ids` (per-form — revised in Phase B)
+- Add `pub hint_ids: &'static [&'static str]` to `CommandNode`
+  (`src/dsl/grammar/mod.rs:512`, beside `help_id` / `usage_ids`),
+  **mirroring `usage_ids`** — *not* a per-node `Option<&str>`. The Phase-B
+  exemplar (`add 1:n relationship`) showed per-*node* keying is too coarse:
+  `add`/`drop`/`show`/`create` are each one node spanning many forms, and
+  a live-input hint must be specific to the typed form. Compiler forces
+  every node literal (~37, across `grammar/app.rs`, `data.rs`, `ddl.rs`) to
+  set it — Phase A/B leave most `&[]` (tier-2 fallback); Phase C fills them.
+  **Multi-form nodes list ALL their form keys** (e.g. `add` →
+  `["add_column", "add_relationship", "add_index", "add_constraint"]`) so
+  the form-word disambiguation resolves correctly and unauthored forms fall
+  back at render rather than mis-resolving to a sibling.
+- **Lookup:** `hint_key_for_input_in_mode(source, mode)` returns the single
+  typed form's hint stem, reusing `pick_form_key` (factored out of
+  `usage_key_for_input_in_mode` — shared digit/`m:n`/suffix disambiguation).
+- **Why a new field, not `help_id`** (ADR-0053 D3): `help_id` is `None` on
+  the 7 advanced-SQL forms purely to dedup the `help` *list*; those forms
+  have distinct SQL syntax and need their own block. `hint_ids` is per
+  form. (The parallel `help`-side gap is issue #36; clause-concept hints
+  are deferred — issue #37.)
+
+### 3b. `AppCommand::Hint` + the `HINT` node
+- `AppCommand::Hint` variant (no fields — no topic arg) in
+  `src/dsl/command.rs:544`.
+- `pub static HINT: CommandNode` in `grammar/app.rs` mirroring `HELP` but
+  with **no topic shape** (bare keyword, like `UNDO`): `entry:
+  Word::keyword("hint")`, `shape: EMPTY_SEQ` (as `UNDO`,
+  `grammar/app.rs:333`), `ast_builder:
+  build_hint` (returns `Command::App(AppCommand::Hint)`), `help_id:
+  Some("app.hint")`, `hint_id: Some("app.hint")`, `usage_ids:
+  &["parse.usage.hint"]`.
+- Register `(&app::HINT, CommandCategory::Simple)` in `REGISTRY`
+  (`grammar/mod.rs`), beside `HELP`. (App commands are available in both
+  modes via the existing mechanism.)
+
+## 4. Command identification (live-input → node)
+
+The F1 live-input path needs "which command form is being typed." **The
+lookup machinery already exists** — do not rebuild entry matching:
+- `command_for_entry_word(word) -> Option<(usize, &'static CommandNode)>`
+  (`grammar/mod.rs:811`) returns the matched node for an entry word
+  (Simple-first; the caller extracts the first word of the input).
+- `usage_keys_for_input_in_mode(source, mode)` (`grammar/mod.rs:564`)
+  already performs the **mode-aware** Simple/Advanced selection the hint
+  path needs (advanced `create` → the SQL nodes, simple → the DSL node) —
+  it just returns `usage_ids` rather than the node.
+- **The only new bit:** a thin `hint_id_for_input_in_mode(source, mode)`
+  (or a node-returning sibling of `usage_keys_for_input_in_mode`) that
+  applies the same mode selection and returns the chosen node's
+  `hint_id`. Mirror the existing function; don't duplicate its matching.
+- **`:`-strip:** in Simple mode, strip a leading `:` (one-shot escape,
+  ADR-0003) before identification so `: SELECT …` resolves to the
+  advanced `SELECT` node.
+- No match (empty / unrecognised entry word) → the "getting started"
+  pointer (D2).
+
+## 5. F1 keybinding (read-only overlay)
+
+In `App::handle_key` (`src/app.rs:1155`):
+- Add an F1 arm (`KeyCode::F(1)`) **after** the modal gate and the
+  sidebar-nav gate (inert there, per D2), and **before** the
+  "any other key clears the completion memo" fall-through (`_ =>
+  self.last_completion = None`, ~line 1228) — F1 must **not** clear the
+  memo or touch the buffer/cursor (D1).
+- Behaviour (the trigger matrix, D2):
+  - non-empty input → `note_hint_for_input()` (the command's `hint.cmd`
+    block + the live "Next:" expected-set from the walker).
+  - empty input + `last_error_hint_key` set → `note_hint_for_error()`.
+  - empty input + no recent error → `note_getting_started()`.
+- Returns `Vec::new()` (pure output emission, like `help`).
+- `demo_badge_label` (`app.rs:520`) gains an `F1 → "[F1]"` entry so demo
+  mode surfaces it (ADR-0047).
+
+## 6. The two error routes (D2 / D5)
+
+- **Runtime errors:** add `last_error_hint_key: Option<String>` to `App`.
+  Set it where friendly errors are rendered (`runtime.rs:2615`,
+  `app.rs:2424`) from the error's class key; clear on the next successful
+  command. The `hint` command and empty-input F1 read it.
+- **Pre-submit diagnostics:** the F1 live-input path, when the input
+  carries an under-cursor diagnostic, reads it straight from the walker
+  (`input_diagnostics_in_mode`, the same source the ambient panel uses)
+  and renders that diagnostic's `hint.err.<class>` block instead of (or
+  alongside) the command block. No stored state.
+- Both render from `hint.err.*`.
+
+## 7. Rendering: the `note_hint*` family (D4)
+
+- New `App::note_hint_for_input`, `note_hint_for_error`,
+  `note_getting_started` (siblings of `note_help`/`note_help_topic`,
+  `app.rs:2982`/`3021`).
+- A tier-3 block is **structured** (`what` / `example` / `concept`, plus
+  the live `Next:` line on the input path). The catalogue stores each part
+  under sub-keys (`hint.cmd.<id>.what`, `.example`, `.concept`); the
+  renderer fetches each via `t!` and lays them out as a small framed
+  block.
+- Styling: `OutputKind::System`; `OutputStyleClass::Hint` (muted) on
+  `what`/`concept`/`Next`, `Neutral` on `example` so the runnable line
+  stands out. Reuse `OutputLine::styled` + `push_category_three_prose`
+  patterns (`app.rs:3121`).
+- **Fallback:** if a node's `hint_id` is `None` or a key is missing,
+  degrade to tier-2 (ambient prose for the input path; the verbose error
+  `hint:` for the error path) — never blank.
+
+## 8. Catalogue + `keys.rs`
+
+- New sub-namespaces under the existing top-level `hint:` in
+  `src/friendly/strings/en-US.yaml`: `hint.cmd.<hint_id>.{what,example,
+  concept}` and `hint.err.<class>.{what,example,concept}`.
+- Register every key + its placeholders in `src/friendly/keys.rs`
+  (`KEYS_AND_PLACEHOLDERS`) so the build-time validation covers them.
+- `parse.usage.hint` + `help.app.hint` strings for the command itself.
+
+## 9. Content (Phase C — the bulk, batched per D7)
+
+Exemplars approved in the ADR (`insert` live-input, FK child-side error,
+`add relationship`) are the template. Author in reviewable batches:
+1. **App commands** (~16): save/save as/load/new/rebuild/export/import/
+   replay/undo/redo/mode/messages/copy/help/hint/quit.
+2. **DDL** (simple): create table, create m:n, add column/relationship/
+   index, drop, rename, change column.
+3. **DML** (simple): insert, update, delete, show, seed, explain,
+   select/with.
+4. **Advanced-mode SQL forms** (7): SQL CREATE TABLE, ALTER TABLE,
+   CREATE/DROP INDEX, DROP TABLE, SQL INSERT/UPDATE/DELETE, EXPLAIN SQL —
+   **own blocks, SQL-syntax examples**.
+5. **Runtime error classes** (9): unique, foreign_key ×{child,parent},
+   not_null, check, type_mismatch, not_found, already_exists, generic,
+   invalid_value.
+6. **`diagnostic.*` classes** (~33): arity/type/unknown-table-column/etc.
+
+Each block: `what` (1–2 sentences), `example` (one runnable line,
+mode-correct), `concept` (the relational idea — the teaching part;
+optional only where genuinely none, e.g. `quit`).
+
+## 10. Tests
+
+Written test-first against the Phase-A skeleton where possible.
+
+- **Tier 1 (unit, `app.rs`):**
+  - trigger matrix: F1 non-empty → command block; F1 empty + recent error
+    → error block; F1 empty + none → getting-started; `hint` command +
+    error → error block; `hint` + none → getting-started.
+  - `last_error_hint_key` set on a failing command, cleared on the next
+    success.
+  - routing: a pre-submit diagnostic on the input drives the diagnostic
+    `hint.err`; a runtime error drives the stored-key route.
+  - `:`-strip: `: SELECT …` in Simple mode resolves to the advanced node.
+  - **read-only overlay:** F1 leaves `input`, `input_cursor`, and
+    `last_completion` unchanged.
+  - tier-2 fallback when `hint_id`/key absent.
+- **Tier 2 (`insta`):** snapshot a representative rendered tier-3 block
+  (the `insert` exemplar) so the framed layout + styling spans are locked.
+- **Tier 3 (integration, `tests/it/`):** type a partial command → F1 →
+  block appears, buffer untouched; run a failing insert → `hint` → FK
+  error expansion.
+- **Comprehensiveness coverage test** (enforces D6, the key one): iterate
+  `REGISTRY` and assert every node has a `hint_id` resolving to a
+  `hint.cmd.*` block; assert every runtime-error + `diagnostic.*` class
+  has a `hint.err.*` block. **Red until Phase C completes** — enable
+  (un-`ignore`) as the final gate.
+- `keys.rs` validation continues to guarantee every *referenced* key
+  resolves.
+
+## 11. Keybinding strip + discoverability (Phase D)
+
+- The ADR-0051 bottom strip advertises **F1 = hint** in the editing/
+  typing state (and on the empty-input state, since F1 still does
+  something there). Re-accept the affected full-panel snapshots.
+
+## 12. ADR / docs
+
+- ADR-0053 is committed (`e16ad50`). On completion, flip its Status from
+  "implementation pending" to implemented (with date), and update the
+  README index entry + `requirements.md` **H2 → [x]** and **A1 → [x]**
+  (A1 closes when `hint` lands).
+
+## 13. Risks / watch-list
+
+- **Command-identification reuse.** The lookup exists
+  (`command_for_entry_word` + the mode-aware `usage_keys_for_input_in_mode`,
+  `grammar/mod.rs:811`/`564`); the only new code is a thin node/`hint_id`
+  variant that reuses their selection. Do **not** re-implement entry-word
+  matching — mirror the existing functions.
+- **Structured-key ergonomics.** Three sub-keys per block × ~80 blocks is
+  ~240 catalogue keys; keep the `keys.rs` registration generation tidy
+  (consider a helper that registers the `{what,example,concept}` triple
+  for an id).
+- **Content voice drift across batches.** Re-check each batch against the
+  approved exemplars; the `concept` line is where drift (too terse / too
+  advanced) creeps in. Pedagogy wins ties.
+- **F1 terminal capture.** A few terminals intercept F1; acceptable
+  (it's the convention) but note it if testing surfaces it.
+- **Snapshot churn.** The strip change re-accepts ADR-0051 snapshots;
+  keep that diff isolated.
+- **Coverage-test timing.** It is red through Phases A–C; gate it so CI
+  isn't broken mid-stream (e.g. `#[ignore]` until the final batch), then
+  make passing it the completion criterion.
+```

docs/plans/20260616-public-availability.md

@@ -0,0 +1,193 @@
+# Plan — road to public availability (versioning + install + packaging)
+
+Status: **planning** (2026-06-16). Captures the decisions taken in
+discussion plus the open questions, so the work can proceed in steps.
+The versioning piece is being implemented first and is recorded as a
+decision in **ADR-0054**; the install-script and package-manager pieces
+are roadmap items here until each is built.
+
+Scope note: this repo lives on the self-hosted Gitea at
+`git.lazyeval.net` (`oli/rdbms-playground`); releases publish there
+(ADR-ci-001/003). Publication branding uses the company name **Lazy
+Evaluation Ltd → `lazyeval`**, not the personal `oli` username, for
+anything user-facing (taps, buckets).
+
+---
+
+## 1. Versioning + version surfaces — DECIDED (→ ADR-0054, building now)
+
+- **`Cargo.toml` `version` is the single source of truth.** `--version`
+  reads `env!("CARGO_PKG_VERSION")` (compile-time, no deps).
+- **Two surfaces:** a `--version` / `-V` CLI flag (prints + exits, like
+  `--help`), and an in-app **`version`** app command.
+- **CI discipline:** `release.yaml` gains a guard that asserts the pushed
+  tag `vX.Y.Z` equals `CARGO_PKG_VERSION`, and **fails the release on
+  mismatch** — so the binary's self-reported version, the release name,
+  and the downloaded asset always agree.
+- **Release ritual:** bump `Cargo.toml` → commit → tag `v<that number>`
+  → push tag. (The guard enforces it.)
+- Optional enrichment (not decided): a `build.rs` baking a git short-hash
+  + build date so non-tagged dev builds read `0.2.0 (a1b2c3d)`. Good for
+  bug reports; can be added later.
+
+---
+
+## 2. `install.sh` (curl | sh) — DONE 2026-06-17 (ADR-0055)
+
+**Shipped** `scripts/install.sh` (POSIX sh, shellcheck-clean). Verified
+end-to-end against the live public `v0.1.0` release: platform mappings
+(Linux/macOS × x86_64/aarch64; Windows + unknown arch error cleanly),
+pinned (`RDBMS_VERSION`) and latest (`releases/latest`) paths, SHA-256
+verification (incl. a tamper-rejection check), install to
+`~/.local/bin`, PATH hint. **`install.ps1` (Windows) added 2026-06-17**
+(user chose both a one-liner *and* Scoop/winget; ADR-0055 Amendment 1):
+`irm | iex`, maps host CPU → our `*-windows-gnu`/`-gnullvm` `.exe`,
+SHA-256-verifies, installs to `%LOCALAPPDATA%\Programs\…` + user PATH —
+**written but untested from this env** (no PowerShell; validate on
+Windows). The website copy that references these commands is the
+**website branch's** job (separate agent), later.
+A **shellcheck CI gate** for `scripts/` is a recommended follow-up (not
+added — shellcheck isn't in the flake yet; touches ADR-ci-002).
+
+Original decided shape (for reference):
+
+- **Hosted from the Gitea repo URL** on `git.lazyeval.net` (simplest):
+  `curl -fsSL https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.sh | sh`
+  (exact raw-URL form to confirm against the Gitea version).
+- **Behaviour:** POSIX `sh`; detect `uname` OS+arch → target triple
+  (Linux → the **musl static** build, our universal Linux artifact);
+  query the latest release via the Gitea API
+  (`/repos/oli/rdbms-playground/releases/latest`) → tag → deterministic
+  asset name `rdbms-playground-<tag>-<target>`; download + **verify the
+  `.sha256`**; install to `~/.local/bin` (fallback `/usr/local/bin` with
+  a sudo prompt); `chmod +x`; print a PATH hint if needed.
+- **macOS:** binaries are signed (see §4 signing note); a `curl`
+  download does **not** apply the Gatekeeper quarantine xattr, so the
+  installed binary runs without `xattr` faff.
+- **Windows:** not `curl | sh` — provide a PowerShell `install.ps1`
+  (`irm … | iex`) and/or steer to Scoop/winget (§3).
+- **Security posture:** HTTPS only; in-script checksum verification;
+  document the download-inspect-run alternative (`curl|sh` is a trust
+  tradeoff).
+- **Deliverables we own now:** `scripts/install.sh` (+ later
+  `install.ps1`); confirm releases are **publicly downloadable**; decide
+  whether to also upload `install.sh` as a release asset for a stable
+  link. Website copy referencing the command is the **website branch's**
+  job (separate agent), later.
+
+---
+
+## 3. D3 — package managers (roadmap; each layers on the release assets)
+
+Common thread: a manifest pointing at our checksummed assets + a
+per-release step to bump it. Ordered cheapest → most gatekept.
+
+### 3a. `cargo binstall` + crates.io — PREPARED 2026-06-17 (ADR-0056)
+
+**Done (prep):** crate made publish-ready (dropped `publish = false`;
+added `homepage`/`keywords`/`categories`/`exclude`; authored `README.md`
++ `LICENSE-MIT`); `[package.metadata.binstall]` added with per-target
+overrides (linux-gnu→musl, windows-msvc→gnu/gnullvm; macOS direct);
+`cargo publish --dry-run` clean (913 KiB compressed). Dual license kept;
+`LICENSE-MIT` + `LICENSE-APACHE` (© Lazy Evaluation Ltd) + `CONTRIBUTING.md`
+(inbound=outbound) all in place. **Gated / remaining:** the actual `cargo
+publish` (token, irreversible) at a **new tagged release** (not 0.1.0); a
+real `cargo binstall` validation.
+
+- **Bootstrapping matters (user-flagged):** `binstall` is **not** a
+  built-in cargo subcommand — users must install **`cargo-binstall`**
+  first (its own `curl|sh`/PowerShell installer, or
+  `cargo install cargo-binstall`). **Our instructions must say this.**
+- Add `[package.metadata.binstall]` to `Cargo.toml` (pkg-url template →
+  our Gitea release assets; our naming already fits).
+- **DECIDED (2026-06-17): publish to crates.io** — so the frictionless
+  `cargo binstall rdbms-playground` resolves the crate, and the project
+  is discoverable there. (A crates.io publish is its own small task:
+  metadata completeness — description/license/repository/keywords/readme
+  — and `cargo publish`; the `[package.metadata.binstall]` URL template
+  points binstall at our Gitea release assets.) *(Verify current
+  cargo-binstall behaviour when wiring.)*
+
+### 3b. Scoop (Windows)
+- A **bucket** repo under `lazyeval` on Gitea with a JSON manifest
+  (`.exe` URL + hash + `autoupdate`). Release job commits the bump.
+- Users: `scoop bucket add lazyeval <gitea-url>; scoop install rdbms-playground`.
+
+### 3c. Homebrew (macOS/Linux)
+- A **company-branded tap** — `lazyeval/homebrew-tap` (on Gitea) — with a
+  Ruby formula (per-arch `url` + `sha256`). Release job commits the bump.
+- Users: `brew tap lazyeval/tap https://git.lazyeval.net/lazyeval/homebrew-tap`
+  then `brew install lazyeval/tap/rdbms-playground` (the explicit-URL tap
+  form, since the `user/repo` shorthand assumes GitHub).
+- *"Notability bars"* = the acceptance criteria for the default
+  **homebrew-core** tap (must be sufficiently popular/maintained). Our
+  own `lazyeval` tap sidesteps that entirely — no review gate.
+
+### 3d. winget (Windows)
+- Manifests are YAML PR'd to `microsoft/winget-pkgs` (reviewed by MS).
+- **`wingetcreate` is Windows-only** (.NET) — no good without a Windows
+  runner. **Automatic path to evaluate first: `komac`** — a
+  cross-platform (Rust) winget manifest creator/submitter that runs on
+  our **Linux** CI. *(Verify komac's current capabilities/auth model.)*
+- **Fallback:** a manual YAML PR per release — acceptable given releases
+  are infrequent (user-confirmed).
+
+### Cross-cutting (3a–3d)
+- Two extra repos (tap + bucket) under `lazyeval`, with CI push
+  credentials — setup TBD (user: "we'll figure that out").
+- **`cargo-dist`/"dist"** automates installers + Homebrew + CI, but is
+  **GitHub-Actions/Releases-centric**; on self-hosted Gitea it won't drop
+  in cleanly (installer-script generation might be reusable). Likely
+  hand-roll the manifests + a small "update on release" job instead.
+  *(Verify cargo-dist's current Gitea support before fully ruling out.)*
+
+---
+
+## Open decisions
+
+1. **crates.io:** **RESOLVED 2026-06-17 — yes, publish.** (See §3a.)
+2. **Tracking:** **RESOLVED 2026-06-17 — doc + ADR only, no Gitea
+   issues.**
+3. **Release downloads public:** **CONFIRMED 2026-06-17** — the Gitea
+   releases are publicly downloadable (no auth); `install.sh` relies on
+   it and was verified against the live `v0.1.0`.
+
+### Still open / postponed
+
+- **macOS signing — CONFIRMED BUG (2026-06-16), POSTPONED by the user
+  (2026-06-17)** pending the correct signing ID. Details:
+  - `release-macos.yaml` does `codesign --force --sign -` (ad-hoc) and has
+    **no signing scaffolding at all** (no keychain import, no secrets) —
+    so a downloaded binary is *not* properly signed (user-verified).
+  - **The credential the user has is the wrong type:** `Apple Development:
+    Oliver Sturm (W687M898E4)` is a *development* cert (Gatekeeper won't
+    trust it for distribution). Distribution needs a **`Developer ID
+    Application`** cert (same format, different type). Signing under the
+    company name *"Lazy Evaluation Ltd"* would need an **Organization**
+    Apple Developer account; a personal account signs as "Oliver Sturm".
+  - **Notarization** (required with Developer ID for non-quarantined trust
+    on browser downloads): after signing, `xcrun notarytool submit`. Creds
+    = an **App Store Connect API key** (Issuer ID + Key ID + `.p8`,
+    recommended for CI) *or* Apple ID + app-specific password + Team ID.
+    A bare CLI binary can't be *stapled* (only bundles/dmg/pkg) — Gatekeeper
+    does an online check instead.
+  - **Urgency caveat:** the `curl|sh` path doesn't need any of this (curl
+    downloads aren't quarantined); signing matters for browser downloads
+    from the releases page. Fix when the right cert + creds exist; corrects
+    the ad-hoc docs once landed.
+
+## Sequencing
+
+1. ✅ **Version discipline** (ADR-0054) — `--version`/`-V` + `version`
+   command + CI tag-match guard + tests.
+2. ✅ **`scripts/install.sh`** (ADR-0055) — built + verified against the
+   live public release.
+3. Package managers, cheapest first:
+   - ✅ **`cargo binstall` + crates.io** — *prepared* (ADR-0056);
+     publish gated on a new tagged release + the token.
+   - **← next:** Scoop (`lazyeval` bucket) → Homebrew (`lazyeval` tap) →
+     winget (komac / manual). Two `lazyeval` repos (tap + bucket) + CI
+     push creds to set up.
+4. **Cut a release at a new version** — bump `Cargo.toml` (0.1.0 →
+   0.1.1/0.2.0; the ADR-0054 guard checks the tag), tag, push; the four
+   Linux/Windows targets build immediately. (macOS leg awaits signing.)

docs/requirements.md

@@ -61,11 +61,35 @@ since ADR-0027.)
 
 ## Distribution and install
 
-- [ ] **D1** Cross-platform binaries: Linux, macOS, Windows on
+- [x] **D1** Cross-platform binaries: Linux, macOS, Windows on
   x86_64 and aarch64.
-- [ ] **D2** Single static binary, no runtime dependencies.
+  *(Done 2026-06-15 — CI produces all six. The four non-macOS
+  targets (Linux musl + Windows gnu/gnullvm × x86_64/aarch64) are
+  cross-built from the Linux runner with `cargo-zigbuild` on a `v*`
+  tag (`release.yaml`); the two `*-apple-darwin` targets build
+  natively on a Tart Apple-Silicon runner via the dispatched
+  `release-macos.yaml`. All uploaded to the Gitea release with a
+  `.sha256` each. Decisions in `docs/ci/adr/` (ADR-ci-001/002/003).
+  Runtime-verified by the user: Linux x86_64, Windows aarch64, and both
+  macOS targets (the `release-macos.yaml` dispatch — now triggerable
+  since CI is on `main` — was run end-to-end and the binaries launch);
+  Linux aarch64 + Windows x86_64 remain link-clean / valid-format
+  only.)*
+- [x] **D2** Single static binary, no runtime dependencies.
+  *(Done 2026-06-15, per platform: **Linux** is fully static (musl +
+  `crt-static`); **Windows** is a standalone `.exe` (Zig statically
+  links libc — no mingw runtime DLLs); **macOS** links only system
+  libraries (`libSystem` + the AppKit/Foundation frameworks —
+  inherent on every Mac, never user-installed; the build rewrites the
+  one nix-store `libiconv` path to `/usr/lib` and re-signs ad-hoc).
+  No target requires anything the user must install. ADR-ci-003.)*
 - [ ] **D3** Released via prebuilt binaries plus Homebrew, Scoop,
   `winget`, and `cargo binstall`.
+  *(Prebuilt binaries + checksums now published to Gitea releases
+  (D1); the package-manager manifests (Homebrew / Scoop / winget /
+  `cargo binstall`) remain to do. The asset naming
+  `rdbms-playground-<tag>-<target>` is already binstall-friendly.
+  Tracked under ADR-ci-003 "Deferred".)*
 
 ## TUI shell
 
@@ -250,16 +274,13 @@ since ADR-0027.)
 
 ## App-level commands (per ADR-0003)
 
-- [/] **A1** All canonical app-level commands implemented and
+- [x] **A1** All canonical app-level commands implemented and
   available in both modes: `save`, `save as`, `load`, `new`,
   `rebuild`, `export`, `import`, `seed`, `replay`, `undo`,
   `redo`, `mode`, `help`, `hint`, `quit`.
-  *(Partial: **14 of 15** implemented and available in both modes —
-  `quit`/`q`, `mode simple|advanced`, `help`, `save`, `save as`,
-  `load`, `new`, `rebuild`, `export`, `import`, `replay`, `undo`,
-  `redo`, and now **`seed`** (ADR-0048 / SD1, done 2026-06-11).
-  **Only `hint`** (tracked as H2) remains unregistered. A1 closes
-  when H2 lands.)*
+  *(Done 2026-06-15: the last command, **`hint`**, landed with H2
+  (ADR-0053). All 15 canonical app commands are now registered and
+  available in both modes.)*
 
 ## DSL data commands
 
@@ -793,8 +814,21 @@ since ADR-0027.)
   `returning `) still shows the raw expression first-set —
   typing-time completion already offers the right candidates
   there, so the payoff is small.
-- [ ] **H2** `hint` provides contextual help for the current
+- [x] **H2** `hint` provides contextual help for the current
   input or the most recent error.
+  *(Done 2026-06-15, ADR-0053: an **F1** keybinding gives a tier-3
+  teaching hint for the live partial input (read-only overlay), and a
+  submitted **`hint`** command expands on the most recent runtime error.
+  A new `hint.cmd.<form>` / `hint.err.<class>` catalogue tier
+  (`what`/`example`/`concept`) covers every command form + the 9 runtime
+  error classes, enforced by a comprehensiveness coverage test. Deferred:
+  the pre-submit-diagnostic route + `diagnostic.*` blocks (#38),
+  clause-concept hints (#37). **Content verified 2026-06-15 (handoff-71):**
+  a semantic pass over every `hint.cmd.*`/`hint.err.*` block fixed four
+  errors — `create_table` (compound-PK misread), `save` (no inline name),
+  `import` (hyphen-rejecting target), and `foreign_key.child_side` (wrong
+  `on delete` remedy) — and added a catalogue-driven guard test that parses
+  every command example in its taught mode.)*
 - [x] **H3** `help` provides general reference and per-command
   help.
   *(Done 2026-06-07: the **general reference** is `help` (no arg) —
@@ -857,7 +891,10 @@ since ADR-0027.)
   exists (~55 lines, covers the WHERE-expression and
   table-creation boundaries). **Missing:** a DSL
   command-surface reference and a standalone type-system
-  reference under `docs/`.)*
+  reference under `docs/`. **Note (2026-06-16):** the **canonical**
+  user docs now live on the **website** (ADR-website-001, deployed) —
+  it covers the full feature set; the in-repo `docs/` reference pieces
+  named here remain the outstanding part of DOC1.)*
 
 ## Testing (per ADR-0008)
 
@@ -878,8 +915,18 @@ since ADR-0027.)
   PTY. Correcting a stale `CLAUDE.md` line that read "Tier 4 is
   wired only for the listed critical flows" — it was not wired at
   all. Genuinely deferred.)*
-- [ ] **TT5** CI runs all tiers on Linux, macOS, and Windows on
+- [/] **TT5** CI runs all tiers on Linux, macOS, and Windows on
   stable Rust.
+  *(Partial, 2026-06-15. **CI is live** on the self-hosted Gitea
+  Actions (`docs/ci/adr/`): the gate runs `clippy -D warnings` +
+  `cargo test` (Tiers 1–3) on the **Linux** runner for every branch
+  push / PR, and `release-macos` runs the suite natively on the
+  **macOS** runner. **Windows is build-only** — cross-compiled, not
+  executed (no Windows runner). **Tier 4** (PTY, TT4) is still
+  unwired, so "all tiers" is not yet fully met. "Stable Rust" is
+  satisfied by the flake's pinned `1.95.0` (a stable release, not
+  nightly). Remaining for full TT5: a Windows execution runner and
+  Tier-4 PTY in CI.)*
 
 ## Cross-cutting
 

docs/website/adr/20260604-adr-website-001.md

@@ -0,0 +1,146 @@
+# ADR-website-001: Public website and documentation site
+
+## Status
+
+Accepted (2026-06-04). Implementation plan:
+[`docs/website/plans/20260604-website-implementation-plan.md`](../plans/20260604-website-implementation-plan.md).
+
+> History: drafted as ADR-0042, renamed to ADR-0044 (each collided with a
+> number `main` had independently assigned — H1a took 0042, compound-PK FK
+> took 0043, then relationship-visualization took 0044). Moved to the
+> website ADR namespace (`docs/website/adr/`, id **ADR-website-001**) on
+> 2026-06-10 to end the recurring cross-branch number collision: website
+> decision records now draw from their own dated sequence and never the
+> main global ADR pool (see ADR-0000 "Numbering discipline"). Content is
+> unchanged from the original draft.
+
+## Context
+
+RDBMS Playground is nearing its first public release and needs a public
+website that does two jobs: **attract** — a landing page that shows the
+playground in action — and **document** — a thorough, canonical reference
+for everything the playground can do.
+
+The documentation-heavy surface is already implemented and verified (full
+simple- and advanced-mode command set, the ten-type vocabulary,
+relationships, constraints, indexes, EXPLAIN, undo/history/replay, projects,
+export/import, the teaching echo, clipboard, friendly errors, tab completion
+and syntax highlighting; 2151 tests passing at the time of writing). The
+site is therefore largely a presentation-and-writing effort, not a
+wait-for-features one. A grounded inventory of what is shippable now lives
+in the implementation plan.
+
+Several choices here had no canonical default; they were settled during a
+planning + `/runda` pass with the user and are recorded below.
+
+## Decision
+
+1. **Stack — Astro 6 + Starlight + Tailwind v4.** Astro's content-first,
+   zero-JS-by-default model with the Starlight docs theme fits a
+   marketing-landing-plus-heavy-docs site better than the alternative
+   considered, SvelteKit + Tailwind (the usual go-to here). Interactive
+   pieces are added as Astro islands (Svelte or vanilla), so Svelte is still
+   available where it earns its place. Tailwind v4 is wired via the official
+   `@tailwindcss/vite` plugin; the `@astrojs/starlight-tailwind` plugin
+   bridges Tailwind with Starlight's theming.
+
+2. **Demo medium — asciinema.** Showcase sequences are recorded as
+   asciinema `.cast` files (text-based, small, faithful to the full
+   alternate-screen render) and embedded with `asciinema-player`. The same
+   casts are reused inline in the docs — one recording format serves both
+   the landing page and documentation enrichment. Recordings are produced by
+   a **scripted-input driver** that types commands into a real PTY with
+   viewer-friendly pacing; the app's own `history.log` **replay** (ADR-0034)
+   re-executes commands without typing animation or pacing and is therefore
+   suitable only for state-deterministic docs snippets, not the hero demo.
+
+3. **In-page WASM playground — deferred** (OOS: **deferred**, not rejected).
+   A live, type-it-yourself playground compiled from the Rust app to
+   WebAssembly is desirable but is a multi-week sub-project, so it does not
+   block the site. The demo section is designed with a stable seam (a single
+   `Demo` component contract) so a WASM playground island can replace the
+   asciinema player later with no change to call sites. Recorded boundary
+   for that future work:
+   - **Portable core (runs on `wasm32-unknown-unknown` largely as-is):**
+     `src/dsl/*` (parser, types, grammar, walker), the pure `App::update()`,
+     `ui.rs`, `theme.rs`, `friendly/*`, output rendering; an in-memory DB
+     path already exists (`Connection::open_in_memory()`). `rusqlite`
+     compiles to the browser target via its `ffi-sqlite-wasm-rs` feature.
+   - **Native edge needing `cfg`-gated browser replacements:** the
+     multi-thread Tokio runtime + the dedicated DB **worker thread**
+     (ADR-0010) → current-thread/in-line async; `crossterm` terminal +
+     event-stream → a browser backend (e.g. Ratzilla's DOM/Canvas) + DOM
+     events; `arboard`, `zip`, file persistence (ADR-0015), file logging;
+     and the rusqlite **backup-API** undo (ADR-0006) → a SQL dump/restore.
+   When taken up, this becomes its own ADR + iteration plan.
+
+4. **Hosting — portable static build; Cloudflare is the target (decided
+   2026-06-11).** Astro 6 builds to static HTML/CSS with no adapter, so the
+   output deploys equally to Cloudflare, Vercel, Netlify, or GitHub Pages — we
+   stay uncoupled from any one host. **Planned pipeline: Gitea Actions →
+   Cloudflare.** Cloudflare now steers new projects to **Workers (static
+   assets)** over Pages; either serves the static `dist/` and needs no Astro
+   adapter (the `@astrojs/cloudflare` adapter is only for SSR, which the site
+   does not use). The future in-page WASM playground (§3), if it needs
+   COOP/COEP headers, can get them from Cloudflare `_headers`. **CI implemented
+   2026-06-15** (`.gitea/workflows/website.yaml`): a push touching `website/**`
+   builds the static site with pnpm and deploys `dist/` to the Cloudflare Pages
+   project **`relplay`** via `wrangler` (Direct Upload — no Git integration).
+   The `--branch` label selects environment against the project's production
+   branch (`main`): **`main` → production (`relplay.org`)**, **`website` →
+   preview (`website.relplay.pages.dev`)**, with `staging.relplay.org` attachable
+   to the `website` branch alias. The crate's CI gate (`ci.yaml`) skips
+   website-only pushes; the build is pure-Node (the `.cast` files are committed,
+   so no cargo). Secrets: `CLOUDFLARE_API_TOKEN` + `CLOUDFLARE_ACCOUNT_ID`.
+
+5. **Repo topology — monorepo.** The site lives under `website/` in the
+   playground repo; the crate stays at the repo root. The repo as a whole
+   moves to its public home later; site and crate travel together.
+
+6. **Canonical docs home — the website.** User-facing documentation lives on
+   the site. In-repo `docs/` keeps ADRs, handoffs, and development notes;
+   `docs/simple-mode-limitations.md` (requirement DOC1) was a development aid
+   and now *feeds* the site's content rather than competing with it. The
+   sharing recipes promised by requirement E2 become a docs page.
+
+7. **Documentation scope and conventions.** Document the **full supported
+   feature set**. Any capability not yet fully implemented (a small minority
+   — e.g. multi-line input, query cancellation, `seed`, `m:n` convenience,
+   ER-diagram export, the `show tables`/`relationships`/`indexes` family) is
+   either omitted or carries a clear **"planned / not yet available"**
+   callout — never presented as shipped. Two wording rules bind all
+   user-facing copy:
+   - **No engine name** (SQLite/STRICT/rusqlite/PRAGMA) — continues the
+     user-facing posture of ADR-0002; copy says "the database"/"the engine".
+   - **No "DSL"** — it is internal jargon. The two input modes are **simple
+     mode** (the playground's keyword command language) and **advanced
+     mode** (SQL).
+
+8. **Install documentation — two mechanisms.** The install page documents
+   **prebuilt release binaries** (self-hosted download — not GitHub
+   Releases, since the repo will move) and **package managers**. Both can be
+   written now against the planned mechanisms; concrete download URLs slot in
+   at release. (Distribution items D1–D3 in `requirements.md` remain the
+   tracking home for the release tooling itself.)
+
+## Consequences
+
+- The site can ship on the strength of already-implemented features; it is
+  gated on writing and recording, not on finishing the app.
+- One recording format (asciinema `.cast`) serves both marketing and docs,
+  and is reusable as the app evolves (re-run the script, re-record).
+- The WASM playground is preserved as a real future option without holding
+  up launch; the demo seam keeps the upgrade cheap.
+- A single canonical docs home removes the divergence risk of maintaining
+  user docs in two places.
+- Website build choices (Decisions 1, 2, 4, 5) are recorded here for
+  traceability but do not, by themselves, warrant further ADRs; only
+  app-architecture decisions (notably the future WASM port) will.
+
+## Out of scope
+
+- **In-page WASM playground** — *deferred* (see Decision 3); revisit as its
+  own ADR + iteration plan.
+- **Hosted/SaaS playground or a server-backed doc CMS** — *rejected*: a
+  static site fully satisfies the need, consistent with ADR-0007's
+  no-hosted-publishing stance. Revisit only if real demand emerges.

docs/website/adr/README.md

@@ -0,0 +1,19 @@
+# Website Architecture Decision Records
+
+Decision records for the **public website + documentation site** subproject
+(the Astro/Starlight site under `website/`). These are kept in their own
+namespace, separate from the project-wide ADRs in
+[`docs/adr/`](../../adr/README.md), so website decisions never compete with
+the main global ADR sequence for numbers — see
+[ADR-0000 "Numbering discipline"](../../adr/0000-record-architecture-decisions.md).
+
+**Numbering.** Files are named `<date>-adr-website-<NNN>.md` and referenced
+in prose as `ADR-website-NNN`. The `<date>` (the ADR's accepted/created day,
+`YYYYMMDD`) plus the `website` segment keeps the namespace disjoint from
+`main`'s integers. Assign the next free `NNN` from this index. Every ADR
+change updates this index in the same edit (the ADR-0000 index-upkeep rule
+applies here too).
+
+## Index
+
+- [ADR-website-001 — Public website and documentation site](20260604-adr-website-001.md) — **Accepted 2026-06-04** (formerly ADR-0044 in the main index; moved here 2026-06-10 to end recurring cross-branch number collisions). The first public website: a marketing landing page plus the **canonical** user docs. Stack **Astro 6 + Starlight + Tailwind v4** (chosen over SvelteKit + Tailwind for a docs-heavy + marketing site; interactive bits as Astro islands). Showcase demos are **asciinema** `.cast` recordings (scripted-input driver for paced, re-recordable sessions — *not* `history.log` replay), reused inline in docs. The **in-page WASM playground is deferred** (OOS: deferred) behind a stable `Demo` seam, with the portable-core vs native-edge boundary recorded for a future ADR + iteration plan. Portable **static build** (**Cloudflare** target via **Gitea Actions**, host-agnostic); **monorepo** (`website/`). **§4 update (CI implemented):** the static→Cloudflare Pages deploy now runs via Gitea Actions (`.gitea/workflows/website.yaml`; the crate gate is skipped for website-only changes); both `website` and `main` are merged and the site is **deployed**. Docs cover the **full supported feature set** with "planned" callouts for the unshipped minority; two wording rules bind user-facing copy — **no engine name** (continues ADR-0002) and **no "DSL"** ("simple mode" / "advanced mode"). Install docs cover **prebuilt binaries + package managers** (D1–D3 track the release tooling). Plan: [`docs/website/plans/20260604-website-implementation-plan.md`](../plans/20260604-website-implementation-plan.md)

docs/website/plans/20260604-website-implementation-plan.md

@@ -0,0 +1,198 @@
+# Plan: public website and documentation site
+
+**Date:** 2026-06-04 · **Status:** ready to build
+
+Decisions for this work are recorded in
+[ADR-website-001](../adr/20260604-adr-website-001.md): Astro 6 +
+Starlight + Tailwind v4; asciinema demos reusable in docs; the in-page WASM
+playground deferred behind a stable demo seam; portable static hosting
+(Vercel target); monorepo (`website/`); website is the canonical docs home;
+full-feature-set docs with "planned" callouts; install docs cover prebuilt
+binaries + package managers. This plan is the *how*.
+
+## Repository layout
+
+The site lives under `website/` in this repo; the crate stays at the root.
+
+```
+website/
+├── package.json              # pnpm; astro, @astrojs/starlight, tailwind v4
+├── astro.config.mjs          # Starlight integration + sidebar nav
+├── src/
+│   ├── pages/index.astro     # marketing landing (custom, not Starlight)
+│   ├── components/
+│   │   ├── Demo.astro        # demo SLOT — the WASM-playground seam
+│   │   └── Cast.astro        # asciinema-player island wrapper
+│   ├── content/docs/         # Starlight MDX docs (the bulk of the work)
+│   └── styles/               # shared Tailwind + Starlight theme tokens
+├── public/casts/             # recorded *.cast asciinema files
+├── README.md                 # local dev + recording recipe
+└── STYLE.md                   # living documentation style guide
+```
+
+Root `.gitignore` gains `website/node_modules`, `website/dist`,
+`website/.astro`.
+
+## Documentation inventory (grounded — drives Phase D scope)
+
+Built from `docs/handoff/55–59`, `docs/adr/*`, the command REGISTRY
+(`src/dsl/grammar/mod.rs:603`, which also auto-assembles in-app `help`), the
+`Command` enum (`src/dsl/command.rs:149`), and
+`src/friendly/strings/en-US.yaml` — **not** the coarse `requirements.md`
+checkboxes (handoff-59 found those ~46% mis-marked; they now use a `[/]`
+"partial" legend — trust the code, not the marker). Refreshed **2026-06-09
+after merging `main`**, which added the show-list/detail, `help <command>`,
+and compound-PK FK surface (see the dedicated bullet below). Test state:
+**2193 passing, 0 failing, 1 ignored.**
+
+**SHIPPED — document as-is (the doc core):**
+- Input modes: simple, advanced (SQL), `:` one-shot escape, `mode` command,
+  per-project mode restore (ADR-0003/0015/0037).
+- Full simple-mode command surface: create/drop table; add/drop/rename/
+  change column; add/drop 1:n relationship (named, ON DELETE/UPDATE
+  CASCADE/SET NULL/RESTRICT, `--create-fk`); add/drop index; insert/update/
+  delete (required WHERE + `--all-rows`; complex WHERE: AND/OR/NOT, LIKE,
+  IS NULL, IN, BETWEEN); show table/data (where/limit); add/drop constraint;
+  explain (ADR-0009/0013/0014/0025/0026/0028/0029).
+- Full advanced-mode SQL: CREATE/DROP/ALTER TABLE (cols, constraints, inline
+  + table FKs, rename, alter-column-type), CREATE [UNIQUE]/DROP INDEX; SELECT
+  (joins, GROUP BY/HAVING, ORDER BY, LIMIT/OFFSET, UNION/INTERSECT/EXCEPT,
+  WITH [RECURSIVE] CTEs); INSERT (multi-row, ON CONFLICT, RETURNING)/UPDATE/
+  DELETE; full expression grammar incl. CASE, CAST, curated functions;
+  EXPLAIN over SQL (ADR-0030–0039).
+- Types: all ten, advanced-mode SQL aliases, serial/shortid auto-fill
+  (ADR-0005/0011/0017/0018). Constraints: PK incl. compound, NOT NULL,
+  UNIQUE, CHECK, DEFAULT, FK (ADR-0029/0013/0035).
+- Undo/redo, history.log journal, replay, `--resume`, `--no-undo`
+  (ADR-0006/0034). Projects & storage: project.yaml + CSV + history.log,
+  save/save as/load/new/rebuild, temp projects, `--data-dir`
+  (ADR-0004/0015). Export/import (zip), clipboard copy/copy all/copy last
+  (ADR-0007/0041).
+- Friendly errors (all five categories) + validity indicator
+  (ADR-0019/0027), DSL→SQL teaching echo (ADR-0038), EXPLAIN plan tree
+  (ADR-0028), box-drawing tables (ADR-0016), tab completion + syntax
+  highlighting + in-line editing (ADR-0022).
+- **Added by the `main` merge (2026-06-09):** schema-inspection commands
+  `show tables` / `show relationships` / `show indexes` and the singular
+  `show relationship <name>` / `show index <name>` detail views (V5/V5a);
+  `help [<command>]` per-command detail + `help types` + general reference
+  (H3); **compound-primary-key foreign-key references** — DSL
+  `from <P>.(a, b) to <C>.(x, y)` and SQL `FOREIGN KEY (a, b) REFERENCES
+  P(x, y)` (single-column form unchanged) (ADR-0043, T3); friendlier
+  parse-error near-miss messaging (H1a, ADR-0042). These need coverage: a
+  schema-inspection page (the `show` family) and compound-FK examples on the
+  Relationships page.
+
+**DOCUMENT WITH CAVEAT:** `add unique index` is advanced-only; simple-mode
+table rename is intentionally absent (rename is `ALTER TABLE … RENAME TO`);
+`hint` (H2) is still partial; a compound-FK *violation* message names only
+the first column pair (enforcement is correct — a messaging-only residual).
+
+**OMIT or MARK "planned":** multi-line input (I1), readline shortcuts (I1b),
+in-flight cancellation / query timeout (I5/B3), `seed` (SD1), `m:n`
+convenience (C4), one-step modify relationship (C3a), relationship line-art
+(V1), ER-diagram export (V3), session-log + Markdown export (V4).
+
+**Mine verbatim for docs:** `en-US.yaml` `help.app.*`, `help.ddl.*`,
+`help.data.*`, `help.types_reference`, `parse.usage.*` (one-line syntax
+templates), `hint.*` — keeps docs and in-app help consistent.
+
+## Phases
+
+### A — Scaffold
+`pnpm create astro@latest` (Starlight template) in `website/`; `astro add
+tailwind` (Tailwind v4 via `@tailwindcss/vite`); add
+`@astrojs/starlight-tailwind`. Confirm `pnpm dev` serves and `pnpm build`
+emits a static `dist/`. Echo build steps for traceability.
+
+### B — Landing page
+Custom `src/pages/index.astro` (Starlight owns `/docs/*`). Hero + value prop
+("learn relational databases by doing"), feature highlights from the
+inventory, an embedded demo cast above the fold. Use the `frontend-design`
+skill to avoid generic AI aesthetics; honour NFR-4/5/7 (distinctive design,
+meaningful colour, light/dark).
+
+### C — asciinema recording workflow
+Record real `rdbms-playground` sessions to `public/casts/*.cast` using a
+**scripted-input driver** (e.g. `asciinema-automation`/autocast, or an
+expect/doitlive script) for paced, re-recordable demos. Record at a fixed
+sensible cols×rows; provide light + dark player themes. `Cast.astro` wraps
+`asciinema-player` as a `client:visible` island; the same component embeds
+casts inline in docs. Document the recipe in `website/README.md`.
+(`asciinema` 2.4.0 is installed.)
+
+### D — Documentation (the bulk)
+**Five** top-level sidebar sections (autogenerated per directory). The key
+split: *Using the playground* = the application you drive; *Reference* = the
+database language you build with.
+- **Getting started** — install (prebuilt binaries + package managers),
+  first project, simple vs. advanced mode, the example library.
+- **Using the playground** — command-line options; the assistive editor
+  (completion, syntax highlighting, the `[ERR]`/`[WRN]` validity indicator,
+  hints, in-line editing); the output pane (PageUp/PageDown scrolling — the
+  fuller V4 session-log / Markdown export is *planned*, mark it); projects
+  (save / load / new / rebuild); undo, redo & history (+ replay); export &
+  import (E2 recipes); copy to clipboard; getting help (`help` /
+  `help <command>` / `hint`). (ADR-0003 "app-level commands" + ADR-0022/0027
+  typing assistance + the CLI.)
+- **Guides** — task walkthroughs.
+- **Reference** — the database language: Tables, Columns, Relationships,
+  Indexes, Constraints, Inserting & editing data, Querying & inspecting
+  (`show` / `select`), Types, Query plans (EXPLAIN), Errors explained, the
+  simple-command → SQL teaching echo.
+- **Concepts** — the *why*: projects & storage model, the derived database,
+  how undo works.
+
+**Surface the assistive editor prominently** — it is a differentiator and
+most helps beginners: a landing-page card + a Getting-started mention, both
+linking into *Using the playground*. It is prime asciinema-cast material
+(completion / validity indicator are motion a still code block can't show).
+
+Build order: Tier 1 simple-mode reference + types + constraints + input
+modes + mined help/usage strings → Tier 2 advanced SQL + relationships +
+project lifecycle + undo/history → Tier 3 teaching echo + EXPLAIN + errors +
+completion/highlighting → Tier 4 clipboard + hints + editing.
+
+Conventions live in the **living style guide** `website/STYLE.md` (binding
+rules from ADR-website-001 §7 — no engine name, **no "DSL"**, "planned" callouts —
+plus finer conventions and an open-decisions log for depth/splitting/example
+dataset/etc. as they settle). Sources to mine: `src/dsl/command.rs`,
+`src/dsl/grammar/*`, the REGISTRY, `en-US.yaml`, `docs/adr/*`,
+`docs/simple-mode-limitations.md`.
+
+### E — Hosting & portability
+Keep the default static build (no adapter); `dist/` deploys to Vercel or any
+static host. `website/README.md` notes the Vercel preset (root dir
+`website/`) and the one-line `@astrojs/vercel` switch if SSR is ever needed.
+
+## Demo seam (WASM hook)
+
+`Demo.astro` exposes a stable contract (`{ src, title, height, autoplay }`).
+At launch it renders `Cast.astro`; later a `Playground.astro` WASM island
+swaps in behind the same props on the landing page and in docs, with zero
+call-site changes. Boundary details are in ADR-website-001 §3.
+
+## Verification
+
+- `pnpm dev` renders landing + docs; `pnpm build` emits a clean static
+  `dist/` with no errors/warnings.
+- Landing shows at least one playing `.cast`; the same component renders a
+  cast inline in a docs page (proves reuse).
+- Starlight link-check passes (broken internal links fail the build).
+- Docs grep clean of forbidden terms: **no "DSL"**, no engine name.
+- A `dist/` static deploy works on Vercel (manual import) — confirms
+  portability. (No CI gate yet, per ADR-website-001 §4.)
+
+## Notes / recommendations (non-blocking)
+
+- **Doc drift:** consider generating the command reference from source (the
+  `help` REGISTRY / `en-US.yaml`) rather than hand-writing all of it.
+- **Accessibility/SEO:** pair each hero `.cast` with a text transcript or the
+  equivalent docs snippet.
+- **Branding/domain & analytics** unspecified — assume none until decided;
+  no third-party trackers without consent.
+- Tailwind v4 + Starlight have occasional theme-token friction; the
+  `@astrojs/starlight-tailwind` plugin is the supported bridge.
+- Starlight ships local search (Pagefind) by default.
+- No `README.md` exists at the repo root yet — wanted for the destination
+  repo; out of this plan's core scope but flagged.

flake.lock

@@ -0,0 +1,82 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1780902259,
+        "narHash": "sha256-q8yYEC5f1mFlQO9RGna4LTc9QrcvWunX6FYp83munkQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bd0ff2d3eac24699c3664d5966b9ef36f388e2ca",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-26.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1781234414,
+        "narHash": "sha256-HdA+P4fKRGOomkewnI/Tww5Wz4xK1O7+hDO90YAsPB4=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "1d18bfe3de6244c641ca4e8011186d0981b81d76",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,98 @@
+{
+  description = "RDBMS Playground — Rust TUI dev environment + reproducible build";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import rust-overlay) ];
+        };
+
+        # Single source of the Rust toolchain: the rustup toolchain file.
+        # rust-overlay provisions the exact channel + components declared there,
+        # so the dev shell and the build package share one pinned toolchain.
+        rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        # Read the package version straight from Cargo.toml so it never drifts
+        # from the crate metadata (no hand-maintained duplicate here).
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+
+        # System build inputs are deliberately tiny — this is a pure-Rust TUI:
+        #   * libsqlite3-sys is built with the `bundled` feature, so SQLite is
+        #     compiled from vendored C. That needs a C compiler, which the
+        #     stdenv provides automatically (no entry required here).
+        #   * arboard's clipboard backend is `x11rb` — a pure-Rust socket XCB
+        #     client. It links no C X11 libraries, so none appear below. A live
+        #     X server is only needed at *runtime* to copy; headless sessions
+        #     fall back to OSC 52.
+        # If a future dependency introduces a pkg-config / native-lib link, add
+        # it here (and document why) rather than leaking it into the host env.
+        nativeBuildInputs = [ ];
+        buildInputs = [ ];
+
+        # `nix build` → the release binary, built reproducibly from the pinned
+        # toolchain and the committed Cargo.lock (importCargoLock fetches each
+        # dependency by its lockfile checksum — offline, no cargoHash to churn).
+        # CI's release job consumes this artifact; the gate's tests run
+        # separately via `nix develop -c cargo test` (see below), so the package
+        # build skips the suite — the nix sandbox has no HOME/X server and would
+        # fight the project-dirs / clipboard paths the tests touch.
+        rdbms-playground = pkgs.rustPlatform.buildRustPackage {
+          pname = cargoToml.package.name;
+          version = cargoToml.package.version;
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+          inherit nativeBuildInputs buildInputs;
+          doCheck = false;
+        };
+      in {
+        packages.default = rdbms-playground;
+        packages.rdbms-playground = rdbms-playground;
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = buildInputs ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
+            # macOS release builds (aarch64/x86_64-apple-darwin) link AppKit
+            # (arboard) + libSystem; the Apple SDK provides those framework/
+            # system-lib stubs as *system* paths (/usr/lib, /System/Library).
+            # NOTE: the darwin stdenv still propagates a *nix-store* libiconv and
+            # links it regardless of inputs, so the release workflow rewrites that
+            # one load path to /usr/lib/libiconv.2.dylib (install_name_tool) and
+            # re-signs — see release-macos / the macOS smoke-test. Adding
+            # `pkgs.libiconv` here would only reinforce the wrong path, so don't.
+            pkgs.apple-sdk
+          ];
+          nativeBuildInputs = nativeBuildInputs ++ [
+            rust
+            # Dev-disk maintenance: cargo never garbage-collects stale per-hash
+            # build artifacts, so target/ creeps into the tens of GB (see
+            # CLAUDE.md "Build hygiene"). cargo-sweep prunes them; run it
+            # periodically between milestones.
+            pkgs.cargo-sweep
+          ] ++ pkgs.lib.optionals pkgs.stdenv.isLinux [
+            # Cross-compilation for the non-macOS D1 targets: `cargo zigbuild`
+            # uses Zig's bundled clang + libc as one universal cross cc/linker
+            # (incl. the `cc`-crate compile of rusqlite's bundled SQLite C) for
+            # Linux musl + Windows gnu/gnullvm. macOS builds natively with the
+            # Apple toolchain on the Mac runner, so these are Linux-only.
+            pkgs.cargo-zigbuild
+            pkgs.zig
+          ];
+
+          shellHook = ''
+            echo "RDBMS Playground dev shell ($(uname -s))"
+            echo "  rust:   $(rustc --version | cut -d' ' -f1-2)"
+            echo "  cargo:  $(cargo --version | cut -d' ' -f1-2)"
+          '';
+        };
+      });
+}

rust-toolchain.toml

@@ -0,0 +1,26 @@
+[toolchain]
+# Pinned to an exact stable release (not the floating "stable" channel) so
+# `nix flake update` cannot surprise-bump Rust into new clippy lints that would
+# fail the `-D warnings` CI gate. Matches the host toolchain and the datamage
+# flake's convention (its ADR 0046). Bump deliberately, in its own commit.
+channel = "1.95.0"
+# rustfmt + clippy back the `fmt`/`clippy` CI stages; no coverage or WASM
+# tooling is needed here (pure-Rust TUI).
+components = ["rustfmt", "clippy"]
+# The non-macOS D1 release matrix, all cross-built from Linux x86_64 via
+# `cargo zigbuild` (D1: cross-platform binaries; D2: single static binary).
+# Linux uses musl + crt-static for fully static, portable binaries; Windows
+# uses the gnu/gnullvm ABIs (Zig statically links libc, so the .exe is
+# standalone). macOS is deferred — its arboard/AppKit link needs Apple's SDK,
+# which a Linux runner can't supply cleanly (see docs/ci/adr ADR-ci-001).
+targets = [
+  "x86_64-unknown-linux-musl",
+  "aarch64-unknown-linux-musl",
+  "x86_64-pc-windows-gnu",
+  "aarch64-pc-windows-gnullvm",
+  # macOS — built natively on the Apple-Silicon Mac runner (aarch64 native,
+  # x86_64 cross). These need Apple's SDK to link, which a Linux runner can't
+  # supply, so they are produced only on the Mac (see docs/ci/adr ADR-ci-003).
+  "aarch64-apple-darwin",
+  "x86_64-apple-darwin",
+]

scripts/install.ps1

@@ -0,0 +1,112 @@
+<#
+.SYNOPSIS
+    Download and install a prebuilt rdbms-playground binary (Windows).
+
+.DESCRIPTION
+    The Windows counterpart of scripts/install.sh. Detects the CPU
+    architecture, downloads the matching release .exe from the Gitea
+    releases, verifies its SHA-256 checksum, installs it to
+    %LOCALAPPDATA%\Programs\rdbms-playground, and adds that directory to
+    your user PATH.
+
+    Quick start:
+        irm https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.ps1 | iex
+
+    We ship gnu / gnullvm Windows builds (x86_64 / aarch64); this maps the
+    host architecture to the right asset.
+
+.PARAMETER Version
+    Install a specific tag (e.g. v0.2.0) instead of the latest release.
+    Defaults to $env:RDBMS_VERSION, else the latest release.
+
+.PARAMETER InstallDir
+    Install directory. Defaults to $env:RDBMS_INSTALL_DIR, else
+    %LOCALAPPDATA%\Programs\rdbms-playground.
+
+.NOTES
+    Written but NOT tested on Windows from this environment (no PowerShell
+    here) — validate on a real Windows host. The verified sibling is
+    install.sh (Linux/macOS).
+#>
+[CmdletBinding()]
+param(
+    [string]$Version = $env:RDBMS_VERSION,
+    [string]$InstallDir = $(if ($env:RDBMS_INSTALL_DIR) { $env:RDBMS_INSTALL_DIR } else { "$env:LOCALAPPDATA\Programs\rdbms-playground" })
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+# Windows PowerShell 5.1 (the in-box shell) can negotiate only TLS 1.0/1.1 by
+# default, which modern hosts reject. Opt into TLS 1.2 without disturbing any
+# protocols already enabled. (No-op on PowerShell 7.)
+[Net.ServicePointManager]::SecurityProtocol =
+    [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
+
+$Repo = 'https://git.lazyeval.net/oli/rdbms-playground'
+$Api = 'https://git.lazyeval.net/api/v1/repos/oli/rdbms-playground'
+$Bin = 'rdbms-playground'
+
+# Map the host CPU to the target triple we publish for Windows.
+# Read the architecture from the environment rather than
+# RuntimeInformation::OSArchitecture: under Windows PowerShell 5.1 that type
+# resolves from a .NET Framework facade that lacks OSArchitecture, which (with
+# StrictMode) throws "property cannot be found". PROCESSOR_ARCHITECTURE is set
+# on every PowerShell version; PROCESSOR_ARCHITEW6432 reports the true OS
+# architecture when a 32-bit shell runs under WOW64.
+$osArch = [Environment]::GetEnvironmentVariable('PROCESSOR_ARCHITEW6432')
+if (-not $osArch) {
+    $osArch = [Environment]::GetEnvironmentVariable('PROCESSOR_ARCHITECTURE')
+}
+switch ($osArch) {
+    'AMD64' { $target = 'x86_64-pc-windows-gnu' }
+    'ARM64' { $target = 'aarch64-pc-windows-gnullvm' }
+    default { throw "install: unsupported CPU architecture: $osArch" }
+}
+
+# Resolve the release tag (explicit -Version, else the latest release).
+if (-not $Version) {
+    $Version = (Invoke-RestMethod -Uri "$Api/releases/latest").tag_name
+    if (-not $Version) { throw 'install: could not determine the latest release tag' }
+}
+
+$asset = "$Bin-$Version-$target.exe"
+$url = "$Repo/releases/download/$Version/$asset"
+
+$tmp = Join-Path $env:TEMP ([System.Guid]::NewGuid().ToString())
+New-Item -ItemType Directory -Path $tmp -Force | Out-Null
+try {
+    $exe = Join-Path $tmp "$Bin.exe"
+    $shaFile = "$exe.sha256"
+
+    Write-Host "downloading $asset ..."
+    # -UseBasicParsing: Windows PowerShell 5.1's Invoke-WebRequest otherwise
+    # tries to use the Internet Explorer engine and can fail when it is absent.
+    # (No-op on PowerShell 7.)
+    Invoke-WebRequest -UseBasicParsing -Uri $url -OutFile $exe
+    Invoke-WebRequest -UseBasicParsing -Uri "$url.sha256" -OutFile $shaFile
+
+    # The sidecar is "<hash>  <name>"; compare just the hash.
+    $expected = ((Get-Content -Raw $shaFile) -split '\s+')[0].ToLower()
+    $actual = (Get-FileHash -Algorithm SHA256 -Path $exe).Hash.ToLower()
+    if ($expected -ne $actual) {
+        throw "install: checksum mismatch (expected $expected, got $actual) — refusing to install"
+    }
+
+    New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
+    $dest = Join-Path $InstallDir "$Bin.exe"
+    Move-Item -Path $exe -Destination $dest -Force
+    Write-Host "installed $Bin $Version -> $dest"
+
+    # Add the install dir to the user PATH (persistent) if it's not there.
+    $userPath = [Environment]::GetEnvironmentVariable('Path', 'User')
+    if (-not $userPath) { $userPath = '' }
+    if (($userPath -split ';') -notcontains $InstallDir) {
+        $newPath = if ($userPath) { "$userPath;$InstallDir" } else { $InstallDir }
+        [Environment]::SetEnvironmentVariable('Path', $newPath, 'User')
+        Write-Host "added $InstallDir to your user PATH — restart your shell to pick it up"
+    }
+}
+finally {
+    Remove-Item -Path $tmp -Recurse -Force -ErrorAction SilentlyContinue
+}

scripts/install.sh

@@ -0,0 +1,166 @@
+#!/bin/sh
+# install.sh — download and install a prebuilt rdbms-playground binary.
+#
+# Quick start (Linux / macOS):
+#   curl -fsSL https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.sh | sh
+#
+# What it does: detects your OS + CPU, downloads the matching release binary
+# from the Gitea releases (Linux uses the fully-static musl build), verifies
+# its SHA-256 checksum, and installs it to ~/.local/bin.
+#
+# Environment overrides:
+#   RDBMS_VERSION      install a specific tag (e.g. v0.2.0) instead of the latest
+#   RDBMS_INSTALL_DIR  install directory (default: $HOME/.local/bin)
+#   RDBMS_OS           force the OS (testing): Linux | Darwin
+#   RDBMS_ARCH         force the CPU (testing): x86_64 | aarch64
+#
+# Flags:
+#   --print-target   print the resolved target triple and exit (no download)
+#   -h, --help       print this help and exit
+#
+# Notes:
+#   * Windows is not installable via this script (the binary is a .exe) —
+#     use Scoop/winget (planned) or download the .exe from the releases page.
+#   * macOS: a curl download is not quarantined by Gatekeeper, so the binary
+#     runs without extra steps. (Developer-ID signing + notarization is a
+#     separate, planned improvement for browser downloads.)
+#
+# POSIX sh — no bashisms, so it runs under the `sh` of `curl | sh`.
+
+set -eu
+
+REPO_BASE="https://git.lazyeval.net/oli/rdbms-playground"
+API_BASE="https://git.lazyeval.net/api/v1/repos/oli/rdbms-playground"
+BIN_NAME="rdbms-playground"
+PRINT_TARGET=0
+
+err() {
+	printf 'install: %s\n' "$1" >&2
+	exit 1
+}
+info() { printf '%s\n' "$1" >&2; }
+
+usage() {
+	# Lines 2..(first blank) of this file are the human-readable header.
+	sed -n '2,/^$/p' "$0" | sed 's/^# \{0,1\}//'
+}
+
+# Resolve the Rust target triple for the current (or forced) platform.
+# Linux  -> <arch>-unknown-linux-musl   (the fully-static build)
+# macOS  -> <arch>-apple-darwin
+detect_target() {
+	os="${RDBMS_OS:-$(uname -s)}"
+	arch="${RDBMS_ARCH:-$(uname -m)}"
+	case "$os" in
+	Linux | linux) os_part="unknown-linux-musl" ;;
+	Darwin | darwin | macos | macOS) os_part="apple-darwin" ;;
+	MINGW* | MSYS* | CYGWIN* | *Windows* | *windows*)
+		err "Windows is not supported by this installer — use Scoop/winget (planned) or download the .exe from $REPO_BASE/releases" ;;
+	*) err "unsupported operating system: $os" ;;
+	esac
+	case "$arch" in
+	x86_64 | amd64) arch_part="x86_64" ;;
+	aarch64 | arm64) arch_part="aarch64" ;;
+	*) err "unsupported CPU architecture: $arch" ;;
+	esac
+	printf '%s-%s' "$arch_part" "$os_part"
+}
+
+# Download $1 to file $2 (curl or wget).
+download() {
+	if command -v curl >/dev/null 2>&1; then
+		curl -fsSL "$1" -o "$2"
+	elif command -v wget >/dev/null 2>&1; then
+		wget -qO "$2" "$1"
+	else
+		err "need either curl or wget on PATH"
+	fi
+}
+
+# Fetch $1 to stdout (curl or wget).
+fetch() {
+	if command -v curl >/dev/null 2>&1; then
+		curl -fsSL "$1"
+	elif command -v wget >/dev/null 2>&1; then
+		wget -qO- "$1"
+	else
+		err "need either curl or wget on PATH"
+	fi
+}
+
+# The release tag to install: $RDBMS_VERSION if set, else the latest release.
+resolve_version() {
+	if [ -n "${RDBMS_VERSION:-}" ]; then
+		printf '%s' "$RDBMS_VERSION"
+		return
+	fi
+	json=$(fetch "$API_BASE/releases/latest") ||
+		err "could not query the latest release from $API_BASE"
+	# Portable JSON scrape (no jq): the latest-release object carries exactly
+	# one "tag_name": "<tag>" field.
+	tag=$(printf '%s' "$json" |
+		grep -o '"tag_name"[[:space:]]*:[[:space:]]*"[^"]*"' |
+		head -1 | sed 's/.*"\([^"]*\)"$/\1/')
+	[ -n "$tag" ] || err "could not parse the latest release tag"
+	printf '%s' "$tag"
+}
+
+# Verify file $1 against sha256 sidecar $2 (format: "<hash>  <name>").
+verify_checksum() {
+	expected=$(awk '{print $1; exit}' "$2")
+	if command -v sha256sum >/dev/null 2>&1; then
+		actual=$(sha256sum "$1" | awk '{print $1}')
+	elif command -v shasum >/dev/null 2>&1; then
+		actual=$(shasum -a 256 "$1" | awk '{print $1}')
+	else
+		info "warning: no sha256 tool found — skipping checksum verification"
+		return 0
+	fi
+	[ "$expected" = "$actual" ] ||
+		err "checksum mismatch (expected $expected, got $actual) — refusing to install"
+}
+
+main() {
+	while [ $# -gt 0 ]; do
+		case "$1" in
+		--print-target) PRINT_TARGET=1 ;;
+		-h | --help)
+			usage
+			exit 0
+			;;
+		*) err "unknown argument: $1 (try --help)" ;;
+		esac
+		shift
+	done
+
+	target=$(detect_target)
+	if [ "$PRINT_TARGET" = "1" ]; then
+		printf '%s\n' "$target"
+		exit 0
+	fi
+
+	version=$(resolve_version)
+	asset="$BIN_NAME-$version-$target"
+	url="$REPO_BASE/releases/download/$version/$asset"
+	dir="${RDBMS_INSTALL_DIR:-$HOME/.local/bin}"
+
+	tmp=$(mktemp -d 2>/dev/null) || err "could not create a temporary directory"
+	trap 'rm -rf "$tmp"' EXIT INT TERM
+
+	info "downloading $asset ..."
+	download "$url" "$tmp/$BIN_NAME" || err "download failed: $url"
+	download "$url.sha256" "$tmp/$BIN_NAME.sha256" || err "checksum download failed: $url.sha256"
+	verify_checksum "$tmp/$BIN_NAME" "$tmp/$BIN_NAME.sha256"
+
+	mkdir -p "$dir" || err "could not create install directory: $dir"
+	chmod +x "$tmp/$BIN_NAME"
+	mv "$tmp/$BIN_NAME" "$dir/$BIN_NAME" || err "could not install to $dir"
+	info "installed $BIN_NAME $version -> $dir/$BIN_NAME"
+
+	case ":${PATH:-}:" in
+	*":$dir:"*) ;;
+	*) info "note: $dir is not on your PATH. Add it, e.g.:  export PATH=\"$dir:\$PATH\"" ;;
+	esac
+}
+
+main "$@"

src/archive.rs

@@ -30,9 +30,7 @@ use std::path::{Component, Path, PathBuf};
 use tracing::{debug, info};
 use zip::{CompressionMethod, ZipArchive, ZipWriter, write::SimpleFileOptions};
 
-use crate::project::{
-    HISTORY_LOG, PLAYGROUND_DB, PROJECT_YAML, naming::today_local,
-};
+use crate::project::{HISTORY_LOG, PLAYGROUND_DB, PROJECT_YAML, naming::today_local};
 
 /// File names excluded from `export` zips. These are either
 /// derived (`playground.db`), per-process (`.lock`),
@@ -118,20 +116,14 @@ impl std::fmt::Display for ArchiveError {
                     limit = format_args!("{limit:02}"),
                 ))
             }
-            Self::InvalidZip(detail) => f.write_str(&crate::t!(
-                "archive.invalid_zip",
-                detail = detail,
-            )),
-            Self::NotAProjectArchive => {
-                f.write_str(&crate::t!("archive.not_a_project_archive"))
+            Self::InvalidZip(detail) => {
+                f.write_str(&crate::t!("archive.invalid_zip", detail = detail,))
             }
-            Self::MultipleTopFolders => {
-                f.write_str(&crate::t!("archive.multiple_top_folders"))
+            Self::NotAProjectArchive => f.write_str(&crate::t!("archive.not_a_project_archive")),
+            Self::MultipleTopFolders => f.write_str(&crate::t!("archive.multiple_top_folders")),
+            Self::UnsafeEntry(entry) => {
+                f.write_str(&crate::t!("archive.unsafe_entry", entry = entry,))
             }
-            Self::UnsafeEntry(entry) => f.write_str(&crate::t!(
-                "archive.unsafe_entry",
-                entry = entry,
-            )),
         }
     }
 }
@@ -216,13 +208,7 @@ pub fn export_project(
         .unix_permissions(0o644);
 
     add_directory_entry(&mut writer, project_name, dst_zip)?;
-    add_directory_recursive(
-        &mut writer,
-        project_path,
-        project_name,
-        &options,
-        dst_zip,
-    )?;
+    add_directory_recursive(&mut writer, project_path, project_name, &options, dst_zip)?;
 
     writer.finish().map_err(|e| ArchiveError::Zip {
         path: dst_zip.to_path_buf(),
@@ -392,10 +378,7 @@ pub struct ZipInspection {
 ///
 /// Returns the resolved target path and the suffix that was
 /// applied (0 if the original name was free, 2..=99 otherwise).
-pub fn resolve_import_target(
-    parent: &Path,
-    name: &str,
-) -> Result<(PathBuf, u32), ArchiveError> {
+pub fn resolve_import_target(parent: &Path, name: &str) -> Result<(PathBuf, u32), ArchiveError> {
     let direct = parent.join(name);
     if !direct.exists() {
         return Ok((direct, 0));
@@ -495,10 +478,12 @@ pub fn extract_into(
                 source,
             })?;
             let mut buf = Vec::with_capacity(entry.size() as usize);
-            entry.read_to_end(&mut buf).map_err(|source| ArchiveError::Io {
-                path: dst_path.clone(),
-                source,
-            })?;
+            entry
+                .read_to_end(&mut buf)
+                .map_err(|source| ArchiveError::Io {
+                    path: dst_path.clone(),
+                    source,
+                })?;
             out.write_all(&buf).map_err(|source| ArchiveError::Io {
                 path: dst_path.clone(),
                 source,
@@ -523,7 +508,11 @@ mod tests {
         fs::write(p.join(PROJECT_YAML), "version: 1\nproject:\n  created_at: 2026-01-01T00:00:00Z\ntables: []\nrelationships: []\n").unwrap();
         fs::create_dir_all(p.join("data")).unwrap();
         fs::write(p.join("data/Customers.csv"), "Name\nAlice\nBob\n").unwrap();
-        fs::write(p.join(HISTORY_LOG), "T|ok|create table Customers with pk id(serial)\n").unwrap();
+        fs::write(
+            p.join(HISTORY_LOG),
+            "T|ok|create table Customers with pk id(serial)\n",
+        )
+        .unwrap();
         fs::write(p.join(PLAYGROUND_DB), [0u8; 32]).unwrap();
         fs::write(p.join(GITIGNORE), "/playground.db\n").unwrap();
         // Stray atomic-write staging file — must be excluded.
@@ -536,7 +525,9 @@ mod tests {
         )
         .unwrap();
         fs::write(
-            p.join(crate::undo::SNAPSHOTS_DIR).join("0").join(PLAYGROUND_DB),
+            p.join(crate::undo::SNAPSHOTS_DIR)
+                .join("0")
+                .join(PLAYGROUND_DB),
             [0u8; 16],
         )
         .unwrap();
@@ -618,11 +609,15 @@ mod tests {
         let zip_path = tmp.path().join("notaproject.zip");
         let f = fs::File::create(&zip_path).unwrap();
         let mut w = ZipWriter::new(f);
-        w.start_file("foo/bar.txt", SimpleFileOptions::default()).unwrap();
+        w.start_file("foo/bar.txt", SimpleFileOptions::default())
+            .unwrap();
         w.write_all(b"hi").unwrap();
         w.finish().unwrap();
         let err = inspect_zip(&zip_path).expect_err("must refuse");
-        assert!(matches!(err, ArchiveError::NotAProjectArchive), "got: {err:?}");
+        assert!(
+            matches!(err, ArchiveError::NotAProjectArchive),
+            "got: {err:?}"
+        );
     }
 
     #[test]
@@ -631,13 +626,18 @@ mod tests {
         let zip_path = tmp.path().join("multi.zip");
         let f = fs::File::create(&zip_path).unwrap();
         let mut w = ZipWriter::new(f);
-        w.start_file("a/project.yaml", SimpleFileOptions::default()).unwrap();
+        w.start_file("a/project.yaml", SimpleFileOptions::default())
+            .unwrap();
         w.write_all(b"x").unwrap();
-        w.start_file("b/project.yaml", SimpleFileOptions::default()).unwrap();
+        w.start_file("b/project.yaml", SimpleFileOptions::default())
+            .unwrap();
         w.write_all(b"x").unwrap();
         w.finish().unwrap();
         let err = inspect_zip(&zip_path).expect_err("must refuse");
-        assert!(matches!(err, ArchiveError::MultipleTopFolders), "got: {err:?}");
+        assert!(
+            matches!(err, ArchiveError::MultipleTopFolders),
+            "got: {err:?}"
+        );
     }
 
     #[test]

src/cli.rs

@@ -30,6 +30,10 @@ pub struct Args {
     /// `--help` / `-h`: print usage to stdout and exit. The
     /// runtime checks this flag before doing any other work.
     pub help: bool,
+    /// `--version` / `-V`: print the version (`CARGO_PKG_VERSION`,
+    /// the single source of truth — ADR-0054) and exit. Checked
+    /// alongside `--help` before any other work.
+    pub version: bool,
     /// `--no-undo`: disable the auto-snapshot / undo machinery for
     /// this run (ADR-0006 Amendment 1). When set, no snapshots are
     /// taken — zero per-command overhead — and `undo` / `redo`
@@ -62,6 +66,17 @@ pub fn help_text() -> String {
     crate::t!("help.cli_banner")
 }
 
+/// Version line printed by `--version` / `-V` and the in-app `version`
+/// command (ADR-0054).
+///
+/// `CARGO_PKG_VERSION` is the single source of truth — it equals the `v*`
+/// release tag (the release CI guards that), so what the binary reports
+/// always matches the downloaded artifact.
+#[must_use]
+pub fn version_text() -> String {
+    crate::t!("cli.version_line", version = env!("CARGO_PKG_VERSION"))
+}
+
 #[derive(Debug)]
 pub enum ArgsError {
     MissingValue(&'static str),
@@ -81,10 +96,7 @@ pub enum ArgsError {
 impl std::fmt::Display for ArgsError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::MissingValue(flag) => f.write_str(&crate::t!(
-                "cli.missing_value",
-                flag = flag,
-            )),
+            Self::MissingValue(flag) => f.write_str(&crate::t!("cli.missing_value", flag = flag,)),
             Self::InvalidValue {
                 flag,
                 value,
@@ -95,10 +107,7 @@ impl std::fmt::Display for ArgsError {
                 value = value,
                 expected = expected,
             )),
-            Self::Unknown(arg) => f.write_str(&crate::t!(
-                "cli.unknown_argument",
-                arg = arg,
-            )),
+            Self::Unknown(arg) => f.write_str(&crate::t!("cli.unknown_argument", arg = arg,)),
             Self::MultiplePaths { first, second } => f.write_str(&crate::t!(
                 "cli.multiple_paths",
                 first = first,
@@ -129,6 +138,7 @@ impl Args {
         let mut project_path: Option<PathBuf> = None;
         let mut resume = false;
         let mut help = false;
+        let mut version = false;
         let mut no_undo = false;
         let mut mode: Option<Mode> = None;
         // Demonstration mode (ADR-0047): the env var is the default,
@@ -143,6 +153,9 @@ impl Args {
                 "--help" | "-h" => {
                     help = true;
                 }
+                "--version" | "-V" => {
+                    version = true;
+                }
                 "--resume" => {
                     resume = true;
                 }
@@ -208,6 +221,7 @@ impl Args {
             project_path,
             resume,
             help,
+            version,
             no_undo,
             mode,
             demo,
@@ -241,7 +255,11 @@ fn default_theme() -> Theme {
         // Standard convention: 0..=6 and 8 are dark backgrounds,
         // 7 and 9..=15 are light. ITerm emits 15 for white-ish.
         let is_dark = matches!(code, 0..=6 | 8);
-        return if is_dark { Theme::dark() } else { Theme::light() };
+        return if is_dark {
+            Theme::dark()
+        } else {
+            Theme::light()
+        };
     }
     Theme::default()
 }
@@ -294,10 +312,19 @@ mod tests {
 
     #[test]
     fn mode_flag_simple_and_advanced() {
-        assert_eq!(Args::parse(["--mode", "simple"]).unwrap().mode, Some(Mode::Simple));
-        assert_eq!(Args::parse(["--mode", "advanced"]).unwrap().mode, Some(Mode::Advanced));
+        assert_eq!(
+            Args::parse(["--mode", "simple"]).unwrap().mode,
+            Some(Mode::Simple)
+        );
+        assert_eq!(
+            Args::parse(["--mode", "advanced"]).unwrap().mode,
+            Some(Mode::Advanced)
+        );
         // Case-insensitive, like the `mode` command.
-        assert_eq!(Args::parse(["--mode", "ADVANCED"]).unwrap().mode, Some(Mode::Advanced));
+        assert_eq!(
+            Args::parse(["--mode", "ADVANCED"]).unwrap().mode,
+            Some(Mode::Advanced)
+        );
     }
 
     #[test]
@@ -330,7 +357,10 @@ mod tests {
     #[test]
     fn data_dir_flag_parses() {
         let args = Args::parse(["--data-dir", "/tmp/playground-data"]).unwrap();
-        assert_eq!(args.data_dir.as_deref(), Some(std::path::Path::new("/tmp/playground-data")));
+        assert_eq!(
+            args.data_dir.as_deref(),
+            Some(std::path::Path::new("/tmp/playground-data"))
+        );
     }
 
     #[test]
@@ -350,13 +380,11 @@ mod tests {
 
     #[test]
     fn data_dir_and_positional_can_coexist() {
-        let args = Args::parse([
-            "--data-dir",
-            "/tmp/data",
-            "/home/me/MyProject",
-        ])
-        .unwrap();
-        assert_eq!(args.data_dir.as_deref(), Some(std::path::Path::new("/tmp/data")));
+        let args = Args::parse(["--data-dir", "/tmp/data", "/home/me/MyProject"]).unwrap();
+        assert_eq!(
+            args.data_dir.as_deref(),
+            Some(std::path::Path::new("/tmp/data"))
+        );
         assert_eq!(
             args.project_path.as_deref(),
             Some(std::path::Path::new("/home/me/MyProject"))
@@ -366,7 +394,10 @@ mod tests {
     #[test]
     fn two_positional_paths_error() {
         let err = Args::parse(["/a", "/b"]).unwrap_err();
-        assert!(matches!(err, ArgsError::MultiplePaths { .. }), "got: {err:?}");
+        assert!(
+            matches!(err, ArgsError::MultiplePaths { .. }),
+            "got: {err:?}"
+        );
     }
 
     #[test]
@@ -435,7 +466,10 @@ mod tests {
         // Absent `--demo` (and absent env var in the test runner),
         // demo mode is off — zero footprint for real users.
         let args = Args::parse(std::iter::empty::<&str>()).unwrap();
-        assert!(!args.demo, "demo is off unless --demo or the env var is given");
+        assert!(
+            !args.demo,
+            "demo is off unless --demo or the env var is given"
+        );
     }
 
     #[test]
@@ -464,7 +498,10 @@ mod tests {
         }
         // Disabling values.
         for v in ["", "  ", "0", "false", "False", "no", "off", "OFF"] {
-            assert!(!demo_value_is_truthy(v), "{v:?} should not enable demo mode");
+            assert!(
+                !demo_value_is_truthy(v),
+                "{v:?} should not enable demo mode"
+            );
         }
     }
 
@@ -473,6 +510,38 @@ mod tests {
         // Make sure the path-vs-flag distinction is robust:
         // unknown flags don't get silently swallowed as paths.
         let err = Args::parse(["--bogus", "/some/path"]).unwrap_err();
-        assert!(matches!(&err, ArgsError::Unknown(s) if s == "--bogus"), "got: {err:?}");
+        assert!(
+            matches!(&err, ArgsError::Unknown(s) if s == "--bogus"),
+            "got: {err:?}"
+        );
+    }
+
+    // ---- ADR-0054: --version / -V ----
+
+    #[test]
+    fn version_long_flag_parses() {
+        assert!(Args::parse(["--version"]).unwrap().version);
+    }
+
+    #[test]
+    fn version_short_flag_parses() {
+        assert!(Args::parse(["-V"]).unwrap().version);
+    }
+
+    #[test]
+    fn version_defaults_off() {
+        assert!(!Args::parse(std::iter::empty::<&str>()).unwrap().version);
+    }
+
+    #[test]
+    fn version_text_carries_the_cargo_version() {
+        // The binary's self-reported version IS Cargo.toml's (the
+        // single source of truth, ADR-0054) — and the release CI guards
+        // that the `v*` tag equals it.
+        let text = version_text();
+        assert!(
+            text.contains(env!("CARGO_PKG_VERSION")),
+            "version line should embed CARGO_PKG_VERSION; got {text:?}"
+        );
     }
 }

src/completion.rs

@@ -15,10 +15,10 @@
 //! `app.rs`; this module owns the candidate computation.
 
 use crate::dsl::grammar::IdentSource;
+use crate::dsl::parser::parse_command_with_schema_in_mode;
 use crate::dsl::types::Type;
 use crate::dsl::walker::outcome::Expectation;
 use crate::dsl::{ParseError, parse_command};
-use crate::dsl::parser::parse_command_with_schema_in_mode;
 use crate::mode::Mode;
 
 /// Composite literal candidates whose lexed shape is more than
@@ -275,11 +275,7 @@ pub struct Completion {
 /// (case-insensitive starts-with), combined, sorted, and
 /// deduplicated.
 #[must_use]
-pub fn candidates_at_cursor(
-    input: &str,
-    cursor: usize,
-    cache: &SchemaCache,
-) -> Option<Completion> {
+pub fn candidates_at_cursor(input: &str, cursor: usize, cache: &SchemaCache) -> Option<Completion> {
     candidates_at_cursor_in_mode(input, cursor, cache, Mode::Advanced)
 }
 
@@ -358,7 +354,11 @@ pub fn candidates_at_cursor_with_in_mode(
         let word_boundary = run == 0 || bytes[run - 1].is_ascii_whitespace();
         if run < cursor && bytes[run] == b'-' && word_boundary && run < start {
             let pre = crate::dsl::walker::completion_probe_in_mode(&input[..run], cache, mode);
-            if pre.expected.iter().any(|e| matches!(e, Expectation::Flag(_))) {
+            if pre
+                .expected
+                .iter()
+                .any(|e| matches!(e, Expectation::Flag(_)))
+            {
                 start = run;
             }
         }
@@ -473,22 +473,19 @@ pub fn candidates_at_cursor_with_in_mode(
     // walk's `current_table_columns`; fall back to "the union of
     // the look-ahead from_scope's bindings' columns" when leading
     // produced no in-scope columns. Phase-1 DSL paths unaffected.
-    let lookahead_union_columns: Vec<TableColumn> =
-        if probe.current_table_columns.is_none() {
-            let mut out: Vec<TableColumn> = Vec::new();
-            for binding in resolution_from_scope {
-                for col in &binding.columns {
-                    if !out.iter().any(|c| {
-                        c.name.eq_ignore_ascii_case(&col.name)
-                    }) {
-                        out.push(col.clone());
-                    }
+    let lookahead_union_columns: Vec<TableColumn> = if probe.current_table_columns.is_none() {
+        let mut out: Vec<TableColumn> = Vec::new();
+        for binding in resolution_from_scope {
+            for col in &binding.columns {
+                if !out.iter().any(|c| c.name.eq_ignore_ascii_case(&col.name)) {
+                    out.push(col.clone());
                 }
             }
-            out
-        } else {
-            Vec::new()
-        };
+        }
+        out
+    } else {
+        Vec::new()
+    };
     let lookahead_slice: Option<&[TableColumn]> = if lookahead_union_columns.is_empty() {
         None
     } else {
@@ -507,30 +504,23 @@ pub fn candidates_at_cursor_with_in_mode(
     // column list (the structural error path surfaces the
     // unresolved-prefix message).
     let prefix_qualifier = peek_back_qualifier(input, start);
-    let qualified_columns: Option<Vec<String>> = prefix_qualifier
-        .as_ref()
-        .map(|q| {
-            // ADR-0033 §9: `excluded.|` inside an `INSERT … ON
-            // CONFLICT … DO UPDATE` completes to the target table's
-            // columns — `excluded` mirrors the would-be-inserted row.
-            // The target's columns are the INSERT's
-            // `current_table_columns` (set by the target-table slot).
-            // The diagnostic pass enforces the strict DO-UPDATE
-            // byte-range; completion is the softer surface and offers
-            // the columns whenever the INSERT target is in hand.
-            if q.eq_ignore_ascii_case("excluded")
-                && let Some(cols) = current_table_columns
-            {
-                cols.iter().map(|c| c.name.clone()).collect()
-            } else {
-                resolve_qualifier_columns_in(
-                    q,
-                    resolution_from_scope,
-                    resolution_cte_bindings,
-                    cache,
-                )
-            }
-        });
+    let qualified_columns: Option<Vec<String>> = prefix_qualifier.as_ref().map(|q| {
+        // ADR-0033 §9: `excluded.|` inside an `INSERT … ON
+        // CONFLICT … DO UPDATE` completes to the target table's
+        // columns — `excluded` mirrors the would-be-inserted row.
+        // The target's columns are the INSERT's
+        // `current_table_columns` (set by the target-table slot).
+        // The diagnostic pass enforces the strict DO-UPDATE
+        // byte-range; completion is the softer surface and offers
+        // the columns whenever the INSERT target is in hand.
+        if q.eq_ignore_ascii_case("excluded")
+            && let Some(cols) = current_table_columns
+        {
+            cols.iter().map(|c| c.name.clone()).collect()
+        } else {
+            resolve_qualifier_columns_in(q, resolution_from_scope, resolution_cte_bindings, cache)
+        }
+    });
 
     let expected = if probe.expected.is_empty() {
         expected_at(leading, mode)
@@ -574,8 +564,7 @@ pub fn candidates_at_cursor_with_in_mode(
         Some(crate::dsl::grammar::HintMode::ProseOnly(_))
     );
     if partial_prefix.is_empty()
-        && (prose_only_slot
-            || (is_value_literal_signature(&expected) && !has_schema_ident))
+        && (prose_only_slot || (is_value_literal_signature(&expected) && !has_schema_ident))
     {
         return None;
     }
@@ -646,7 +635,13 @@ pub fn candidates_at_cursor_with_in_mode(
     // shortid). The walker surfaces this as
     // `Expectation::Ident { source: Types }`.
     let type_names: Vec<String> = if expected.iter().any(|e| {
-        matches!(e, Expectation::Ident { source: IdentSource::Types, .. })
+        matches!(
+            e,
+            Expectation::Ident {
+                source: IdentSource::Types,
+                ..
+            }
+        )
     }) {
         Type::all()
             .iter()
@@ -725,7 +720,13 @@ pub fn candidates_at_cursor_with_in_mode(
     // filtered like every other source; empty prefix offers the whole
     // set. Tagged `CandidateKind::Function` for its own colour.
     let has_sql_expr_slot = expected.iter().any(|e| {
-        matches!(e, Expectation::Ident { role: "sql_expr_ident", .. })
+        matches!(
+            e,
+            Expectation::Ident {
+                role: "sql_expr_ident",
+                ..
+            }
+        )
     });
     let mut functions: Vec<String> = if has_sql_expr_slot {
         crate::dsl::sql_functions::KNOWN_SQL_FUNCTIONS
@@ -741,9 +742,15 @@ pub fn candidates_at_cursor_with_in_mode(
     // curated vocabulary is offered so a learner can discover `email` /
     // `product` / … by Tab. Same `Function` kind / `tok_function` colour
     // as SQL functions (no new theme colour — ADR-0048 §Grammar).
-    let has_generator_slot = expected
-        .iter()
-        .any(|e| matches!(e, Expectation::Ident { source: IdentSource::Generators, .. }));
+    let has_generator_slot = expected.iter().any(|e| {
+        matches!(
+            e,
+            Expectation::Ident {
+                source: IdentSource::Generators,
+                ..
+            }
+        )
+    });
     if has_generator_slot {
         functions.extend(
             crate::seed::KNOWN_GENERATORS
@@ -765,38 +772,36 @@ pub fn candidates_at_cursor_with_in_mode(
     // (the `typing_over_diag` path) — keeps the alias from flashing as
     // a bogus "unknown column" while typing. Mixed into `identifiers`
     // so it sorts/dedups/colours uniformly with column candidates.
-    let alias_candidates: Vec<String> =
-        if has_sql_expr_slot && prefix_qualifier.is_none() {
-            // Once the partial *exactly* matches an in-scope qualifier,
-            // discoverability is served — the learner has a whole alias
-            // in hand and now needs the "add `.column`" hint
-            // (`diagnostic.alias_used_as_column`), not sibling aliases
-            // that merely share the prefix. Offering them would also let
-            // the `typing_over_diag` path suppress that very hint. So in
-            // the exact-match case we emit no alias candidates and let
-            // the targeted diagnostic surface.
-            let partial_is_exact_alias = resolution_from_scope.iter().any(|b| {
-                let q = b.alias.as_deref().unwrap_or(b.table.as_str());
-                q.eq_ignore_ascii_case(&partial_prefix)
-            });
-            if partial_is_exact_alias {
-                Vec::new()
-            } else {
-                let mut out: Vec<String> = Vec::new();
-                for binding in resolution_from_scope {
-                    let qualifier =
-                        binding.alias.as_deref().unwrap_or(binding.table.as_str());
-                    if matches_prefix(qualifier)
-                        && !out.iter().any(|q| q.eq_ignore_ascii_case(qualifier))
-                    {
-                        out.push(qualifier.to_string());
-                    }
-                }
-                out
-            }
-        } else {
+    let alias_candidates: Vec<String> = if has_sql_expr_slot && prefix_qualifier.is_none() {
+        // Once the partial *exactly* matches an in-scope qualifier,
+        // discoverability is served — the learner has a whole alias
+        // in hand and now needs the "add `.column`" hint
+        // (`diagnostic.alias_used_as_column`), not sibling aliases
+        // that merely share the prefix. Offering them would also let
+        // the `typing_over_diag` path suppress that very hint. So in
+        // the exact-match case we emit no alias candidates and let
+        // the targeted diagnostic surface.
+        let partial_is_exact_alias = resolution_from_scope.iter().any(|b| {
+            let q = b.alias.as_deref().unwrap_or(b.table.as_str());
+            q.eq_ignore_ascii_case(&partial_prefix)
+        });
+        if partial_is_exact_alias {
             Vec::new()
-        };
+        } else {
+            let mut out: Vec<String> = Vec::new();
+            for binding in resolution_from_scope {
+                let qualifier = binding.alias.as_deref().unwrap_or(binding.table.as_str());
+                if matches_prefix(qualifier)
+                    && !out.iter().any(|q| q.eq_ignore_ascii_case(qualifier))
+                {
+                    out.push(qualifier.to_string());
+                }
+            }
+            out
+        }
+    } else {
+        Vec::new()
+    };
 
     // Source 2: schema identifiers — accumulated across every
     // matching schema-listable `Ident { source }` expectation.
@@ -811,9 +816,7 @@ pub fn candidates_at_cursor_with_in_mode(
     let mut identifiers: Vec<String> = expected
         .iter()
         .filter_map(|e| match e {
-            Expectation::Ident { source, .. } if source.completes_from_schema() => {
-                Some(*source)
-            }
+            Expectation::Ident { source, .. } if source.completes_from_schema() => Some(*source),
             _ => None,
         })
         .flat_map(|source| {
@@ -1007,11 +1010,7 @@ fn resolve_qualifier_columns_in(
             .iter()
             .find(|c| c.name.eq_ignore_ascii_case(&binding.table))
         {
-            return cte
-                .columns
-                .iter()
-                .filter_map(|c| c.name.clone())
-                .collect();
+            return cte.columns.iter().filter_map(|c| c.name.clone()).collect();
         }
     }
     // Second: table-name match in the active from_scope.
@@ -1026,11 +1025,7 @@ fn resolve_qualifier_columns_in(
             .iter()
             .find(|c| c.name.eq_ignore_ascii_case(&binding.table))
         {
-            return cte
-                .columns
-                .iter()
-                .filter_map(|c| c.name.clone())
-                .collect();
+            return cte.columns.iter().filter_map(|c| c.name.clone()).collect();
         }
     }
     // Third: direct cte_bindings match (cte_alias.|).
@@ -1038,11 +1033,7 @@ fn resolve_qualifier_columns_in(
         .iter()
         .find(|c| c.name.eq_ignore_ascii_case(qualifier))
     {
-        return cte
-            .columns
-            .iter()
-            .filter_map(|c| c.name.clone())
-            .collect();
+        return cte.columns.iter().filter_map(|c| c.name.clone()).collect();
     }
     // Fourth: a bare table name from the schema cache — DSL
     // paths reach this for `from <Table>.<col>` shapes where
@@ -1287,7 +1278,13 @@ pub fn invalid_ident_at_cursor_in_mode(
     // column. So `select Agx` warns at typing time again, while
     // `select sum` does not.
     let has_sql_expr_slot = expected.iter().any(|e| {
-        matches!(e, Expectation::Ident { role: "sql_expr_ident", .. })
+        matches!(
+            e,
+            Expectation::Ident {
+                role: "sql_expr_ident",
+                ..
+            }
+        )
     });
     if has_sql_expr_slot && crate::dsl::sql_functions::is_known_function_prefix(partial) {
         return None;
@@ -1318,9 +1315,15 @@ pub fn invalid_ident_at_cursor_in_mode(
     // schema-column check below would never see it. A partial that
     // prefix-matches a known generator is an in-progress name; anything
     // else is an unknown generator → flag it `[ERR]` while typing.
-    let has_generator_slot = expected
-        .iter()
-        .any(|e| matches!(e, Expectation::Ident { source: IdentSource::Generators, .. }));
+    let has_generator_slot = expected.iter().any(|e| {
+        matches!(
+            e,
+            Expectation::Ident {
+                source: IdentSource::Generators,
+                ..
+            }
+        )
+    });
     if has_generator_slot {
         if crate::seed::is_known_generator_prefix(partial) {
             return None;
@@ -1335,9 +1338,7 @@ pub fn invalid_ident_at_cursor_in_mode(
     let sources: Vec<IdentSource> = expected
         .iter()
         .filter_map(|e| match e {
-            Expectation::Ident { source, .. } if source.completes_from_schema() => {
-                Some(*source)
-            }
+            Expectation::Ident { source, .. } if source.completes_from_schema() => Some(*source),
             _ => None,
         })
         .collect();
@@ -1412,13 +1413,15 @@ mod tests {
     use pretty_assertions::assert_eq;
 
     fn cands(input: &str, cursor: usize) -> Vec<String> {
-        candidates_at_cursor(input, cursor, &SchemaCache::default())
-            .map_or_else(Vec::new, |c| c.candidates.into_iter().map(|c| c.text).collect())
+        candidates_at_cursor(input, cursor, &SchemaCache::default()).map_or_else(Vec::new, |c| {
+            c.candidates.into_iter().map(|c| c.text).collect()
+        })
     }
 
     fn cands_with(input: &str, cursor: usize, cache: &SchemaCache) -> Vec<String> {
-        candidates_at_cursor(input, cursor, cache)
-            .map_or_else(Vec::new, |c| c.candidates.into_iter().map(|c| c.text).collect())
+        candidates_at_cursor(input, cursor, cache).map_or_else(Vec::new, |c| {
+            c.candidates.into_iter().map(|c| c.text).collect()
+        })
     }
 
     /// Simple-mode completion candidates — the DSL surface
@@ -1429,7 +1432,9 @@ mod tests {
     /// Advanced mode surfaces the SQL grammar's completions instead.
     fn cands_simple(input: &str, cursor: usize) -> Vec<String> {
         candidates_at_cursor_in_mode(input, cursor, &SchemaCache::default(), Mode::Simple)
-            .map_or_else(Vec::new, |c| c.candidates.into_iter().map(|c| c.text).collect())
+            .map_or_else(Vec::new, |c| {
+                c.candidates.into_iter().map(|c| c.text).collect()
+            })
     }
 
     fn cand_kinds_with(
@@ -1438,10 +1443,7 @@ mod tests {
         cache: &SchemaCache,
     ) -> Vec<(String, CandidateKind)> {
         candidates_at_cursor(input, cursor, cache).map_or_else(Vec::new, |c| {
-            c.candidates
-                .into_iter()
-                .map(|c| (c.text, c.kind))
-                .collect()
+            c.candidates.into_iter().map(|c| (c.text, c.kind)).collect()
         })
     }
 
@@ -1503,12 +1505,21 @@ mod tests {
         // Simple-only (column, relationship, constraint).
         let cs = cands("drop ", 5);
         for kw in ["table", "index", "column", "relationship", "constraint"] {
-            assert!(cs.contains(&kw.to_string()), "`drop ` should offer `{kw}`; got {cs:?}");
+            assert!(
+                cs.contains(&kw.to_string()),
+                "`drop ` should offer `{kw}`; got {cs:?}"
+            );
         }
         // Both-mode continuations block before the simple-only ones.
         let pos = |k: &str| cs.iter().position(|c| c == k).unwrap();
-        assert!(pos("table") < pos("column"), "Both block precedes Simple block: {cs:?}");
-        assert!(pos("index") < pos("relationship"), "Both block precedes Simple block: {cs:?}");
+        assert!(
+            pos("table") < pos("column"),
+            "Both block precedes Simple block: {cs:?}"
+        );
+        assert!(
+            pos("index") < pos("relationship"),
+            "Both block precedes Simple block: {cs:?}"
+        );
     }
 
     #[test]
@@ -1631,8 +1642,14 @@ mod tests {
         let c = candidates_at_cursor(input, input.len(), &SchemaCache::default())
             .expect("a `-` at a flag position offers candidates");
         let texts: Vec<&str> = c.candidates.iter().map(|x| x.text.as_str()).collect();
-        assert!(texts.contains(&"--create-fk"), "should offer --create-fk: {texts:?}");
-        assert!(!texts.contains(&"on"), "must NOT offer `on` after a dash: {texts:?}");
+        assert!(
+            texts.contains(&"--create-fk"),
+            "should offer --create-fk: {texts:?}"
+        );
+        assert!(
+            !texts.contains(&"on"),
+            "must NOT offer `on` after a dash: {texts:?}"
+        );
         assert_eq!(
             c.replaced_range,
             (input.len() - 1, input.len()),
@@ -1643,13 +1660,9 @@ mod tests {
     #[test]
     fn double_dash_replaces_both_dashes_on_accept() {
         let input = "delete from T --";
-        let c = candidates_at_cursor_in_mode(
-            input,
-            input.len(),
-            &SchemaCache::default(),
-            Mode::Simple,
-        )
-        .expect("`--` offers the flag");
+        let c =
+            candidates_at_cursor_in_mode(input, input.len(), &SchemaCache::default(), Mode::Simple)
+                .expect("`--` offers the flag");
         assert!(c.candidates.iter().any(|x| x.text == "--all-rows"));
         assert_eq!(
             c.replaced_range,
@@ -1668,9 +1681,7 @@ mod tests {
         s.tables.push("T".into());
         s.columns.push("x".into());
         let input = "show data T where x = -5";
-        if let Some(c) =
-            candidates_at_cursor_in_mode(input, input.len(), &s, Mode::Simple)
-        {
+        if let Some(c) = candidates_at_cursor_in_mode(input, input.len(), &s, Mode::Simple) {
             assert!(
                 !c.candidates.iter().any(|x| x.text.starts_with("--")),
                 "no flags at a value position: {:?}",
@@ -1715,8 +1726,8 @@ mod tests {
         // App-lifecycle commands now appear alongside DSL
         // commands in the entry-keyword set.
         for expected in &[
-            "quit", "help", "rebuild", "save", "new", "load", "export",
-            "import", "mode", "messages", "undo", "redo", "copy",
+            "quit", "help", "rebuild", "save", "new", "load", "export", "import", "mode",
+            "messages", "undo", "redo", "copy",
         ] {
             assert!(
                 cs.contains(&expected.to_string()),
@@ -1943,7 +1954,10 @@ mod tests {
         // opening a sub-shape) becomes a Tab candidate.
         let input = "add column to table T";
         let cs = cands(input, input.len());
-        assert!(cs.is_empty(), "trailing-content punct should not surface: {cs:?}");
+        assert!(
+            cs.is_empty(),
+            "trailing-content punct should not surface: {cs:?}"
+        );
     }
 
     #[test]
@@ -1957,10 +1971,7 @@ mod tests {
         assert!(cs.contains(&"(".to_string()), "got {cs:?}");
     }
 
-    fn schema_with_table(
-        table: &str,
-        columns: &[(&str, crate::dsl::types::Type)],
-    ) -> SchemaCache {
+    fn schema_with_table(table: &str, columns: &[(&str, crate::dsl::types::Type)]) -> SchemaCache {
         let mut cache = SchemaCache::default();
         cache.tables.push(table.to_string());
         let cols: Vec<TableColumn> = columns
@@ -2002,8 +2013,14 @@ mod tests {
         let cache = two_table_alias_cache();
         let input = "select a.id from a o join b z on o.id = z.id group by ";
         let cs = cands_with(input, input.len(), &cache);
-        assert!(cs.contains(&"o".to_string()), "alias `o` must be offered; got {cs:?}");
-        assert!(cs.contains(&"z".to_string()), "alias `z` must be offered; got {cs:?}");
+        assert!(
+            cs.contains(&"o".to_string()),
+            "alias `o` must be offered; got {cs:?}"
+        );
+        assert!(
+            cs.contains(&"z".to_string()),
+            "alias `z` must be offered; got {cs:?}"
+        );
     }
 
     #[test]
@@ -2015,8 +2032,14 @@ mod tests {
         let cache = two_table_alias_cache();
         let input = "select a.id from a aa join b ab on aa.id = ab.id group by a";
         let cs = cands_with(input, input.len(), &cache);
-        assert!(cs.contains(&"aa".to_string()), "alias `aa` must be offered; got {cs:?}");
-        assert!(cs.contains(&"ab".to_string()), "alias `ab` must be offered; got {cs:?}");
+        assert!(
+            cs.contains(&"aa".to_string()),
+            "alias `aa` must be offered; got {cs:?}"
+        );
+        assert!(
+            cs.contains(&"ab".to_string()),
+            "alias `ab` must be offered; got {cs:?}"
+        );
 
         // Exact-alias partial: the alias source steps aside.
         let exact = "select aa.id from a aa join b ab on aa.id = ab.id group by aa";
@@ -2046,19 +2069,20 @@ mod tests {
         // SchemaCache.columns has columns from many tables, but
         // at `update Customers set ` only Customers' columns
         // should appear.
-        let mut cache = schema_with_table(
-            "Customers",
-            &[("id", Type::Int), ("Email", Type::Text)],
-        );
+        let mut cache = schema_with_table("Customers", &[("id", Type::Int), ("Email", Type::Text)]);
         // Pretend the global flat list has columns from a second
         // table that aren't in Customers.
         cache.columns.push("OrderTotal".to_string());
         cache.columns.push("Stock".to_string());
-        cache
-            .table_columns
-            .insert("Orders".to_string(), vec![
-                TableColumn { name: "OrderTotal".to_string(), user_type: Type::Real, not_null: false, has_default: false },
-            ]);
+        cache.table_columns.insert(
+            "Orders".to_string(),
+            vec![TableColumn {
+                name: "OrderTotal".to_string(),
+                user_type: Type::Real,
+                not_null: false,
+                has_default: false,
+            }],
+        );
         cache.tables.push("Orders".to_string());
         let cs = cands_with("update Customers set ", 21, &cache);
         // Customers's columns should appear:
@@ -2079,10 +2103,7 @@ mod tests {
         // *before* ORDER BY (the FROM's JOIN options, WHERE /
         // GROUP BY / HAVING, set-ops). Those used to shove the
         // columns off-screen.
-        let cache = schema_with_table(
-            "Things",
-            &[("Name", Type::Text), ("Qty", Type::Int)],
-        );
+        let cache = schema_with_table("Things", &[("Name", Type::Text), ("Qty", Type::Int)]);
         let input = "select Name from Things order by ";
         let cs = cands_with(input, input.len(), &cache);
         // The columns the user wants are offered:
@@ -2090,8 +2111,19 @@ mod tests {
         assert!(cs.contains(&"Qty".to_string()), "got {cs:?}");
         // Preceding-clause keywords must not leak in:
         for kw in [
-            "where", "group", "having", "join", "union", "intersect",
-            "except", "left", "right", "full", "cross", "inner", "as",
+            "where",
+            "group",
+            "having",
+            "join",
+            "union",
+            "intersect",
+            "except",
+            "left",
+            "right",
+            "full",
+            "cross",
+            "inner",
+            "as",
         ] {
             assert!(
                 !cs.contains(&kw.to_string()),
@@ -2108,10 +2140,7 @@ mod tests {
         // sort item the direction keywords surface as
         // continuations (previously discarded at the Repeated
         // boundary, so completion offered neither).
-        let cache = schema_with_table(
-            "Things",
-            &[("Name", Type::Text), ("Qty", Type::Int)],
-        );
+        let cache = schema_with_table("Things", &[("Name", Type::Text), ("Qty", Type::Int)]);
         let input = "select Name from Things order by Name ";
         let cs = cands_with(input, input.len(), &cache);
         assert!(cs.contains(&"asc".to_string()), "got {cs:?}");
@@ -2123,10 +2152,7 @@ mod tests {
         use crate::dsl::types::Type;
         // walk_repeated trailing-optional fix: after a complete
         // projection item the `as` alias keyword surfaces.
-        let cache = schema_with_table(
-            "Things",
-            &[("Name", Type::Text), ("Qty", Type::Int)],
-        );
+        let cache = schema_with_table("Things", &[("Name", Type::Text), ("Qty", Type::Int)]);
         let input = "select Name ";
         let cs = cands_with(input, input.len(), &cache);
         assert!(cs.contains(&"as".to_string()), "got {cs:?}");
@@ -2153,16 +2179,13 @@ mod tests {
         // ADR-0022 Amendment 2: at an expression position offering
         // both column names and keywords, every column precedes
         // every keyword so the names stay visible by default.
-        let cache = schema_with_table(
-            "Things",
-            &[("Name", Type::Text), ("Qty", Type::Int)],
-        );
+        let cache = schema_with_table("Things", &[("Name", Type::Text), ("Qty", Type::Int)]);
         let input = "select * from Things where ";
         let cs = cands_with(input, input.len(), &cache);
         let pos = |needle: &str| {
-            cs.iter().position(|c| c == needle).unwrap_or_else(|| {
-                panic!("{needle:?} not in candidates: {cs:?}")
-            })
+            cs.iter()
+                .position(|c| c == needle)
+                .unwrap_or_else(|| panic!("{needle:?} not in candidates: {cs:?}"))
         };
         // Both columns come before any expression-start keyword.
         let last_ident = pos("Name").max(pos("Qty"));
@@ -2176,13 +2199,9 @@ mod tests {
     #[test]
     fn update_where_offers_only_current_table_columns() {
         use crate::dsl::types::Type;
-        let mut cache = schema_with_table(
-            "Customers",
-            &[("id", Type::Int), ("Email", Type::Text)],
-        );
+        let mut cache = schema_with_table("Customers", &[("id", Type::Int), ("Email", Type::Text)]);
         cache.columns.push("OrderTotal".to_string());
-        let cs =
-            cands_with("update Customers set Email='x' where ", 37, &cache);
+        let cs = cands_with("update Customers set Email='x' where ", 37, &cache);
         assert!(cs.contains(&"id".to_string()), "got {cs:?}");
         assert!(cs.contains(&"Email".to_string()), "got {cs:?}");
         assert!(!cs.contains(&"OrderTotal".to_string()), "got {cs:?}");
@@ -2208,7 +2227,11 @@ mod tests {
         use crate::dsl::types::Type;
         let cache = schema_with_table(
             "Customers",
-            &[("id", Type::Int), ("Email", Type::Text), ("Name", Type::Text)],
+            &[
+                ("id", Type::Int),
+                ("Email", Type::Text),
+                ("Name", Type::Text),
+            ],
         );
         let cs = cands_with("insert into Customers (", 23, &cache);
         // The user is at Form A's column-list position. All
@@ -2222,10 +2245,7 @@ mod tests {
     #[test]
     fn insert_into_open_paren_does_not_offer_unrelated_columns() {
         use crate::dsl::types::Type;
-        let mut cache = schema_with_table(
-            "Customers",
-            &[("id", Type::Int), ("Email", Type::Text)],
-        );
+        let mut cache = schema_with_table("Customers", &[("id", Type::Int), ("Email", Type::Text)]);
         cache.columns.push("OrderTotal".to_string());
         let cs = cands_with("insert into Customers (", 23, &cache);
         assert!(!cs.contains(&"OrderTotal".to_string()), "got {cs:?}");
@@ -2239,13 +2259,9 @@ mod tests {
         // table's columns. `OrderTotal` belongs to no table in
         // this cache's `table_columns`, so it must not leak.
         use crate::dsl::types::Type;
-        let mut cache = schema_with_table(
-            "Customers",
-            &[("id", Type::Int), ("Email", Type::Text)],
-        );
+        let mut cache = schema_with_table("Customers", &[("id", Type::Int), ("Email", Type::Text)]);
         cache.columns.push("OrderTotal".to_string());
-        let cs =
-            cands_with("drop column from Customers: ", 28, &cache);
+        let cs = cands_with("drop column from Customers: ", 28, &cache);
         assert!(cs.contains(&"Email".to_string()), "got {cs:?}");
         assert!(cs.contains(&"id".to_string()), "got {cs:?}");
         assert!(
@@ -2271,8 +2287,8 @@ mod tests {
 
     #[test]
     fn cursor_mid_keyword_replaces_only_the_partial_prefix() {
-        let comp = candidates_at_cursor("cre", 3, &SchemaCache::default())
-            .expect("some completion");
+        let comp =
+            candidates_at_cursor("cre", 3, &SchemaCache::default()).expect("some completion");
         assert_eq!(comp.replaced_range, (0, 3));
         assert_eq!(comp.partial_prefix, "cre");
         assert_eq!(comp.candidates.len(), 1);
@@ -2282,8 +2298,8 @@ mod tests {
 
     #[test]
     fn cursor_at_word_boundary_has_empty_partial_prefix() {
-        let comp = candidates_at_cursor("create ", 7, &SchemaCache::default())
-            .expect("some completion");
+        let comp =
+            candidates_at_cursor("create ", 7, &SchemaCache::default()).expect("some completion");
         assert_eq!(comp.replaced_range, (7, 7));
         assert_eq!(comp.partial_prefix, "");
     }
@@ -2517,8 +2533,8 @@ mod tests {
         // inside `Name`, and substituting any name there
         // produces a complete command. No useful "next after
         // name" hint.
-        let t = typing_name_at_cursor("add column to table T: Name (text)", 27)
-            .expect("should fire");
+        let t =
+            typing_name_at_cursor("add column to table T: Name (text)", 27).expect("should fire");
         assert_eq!(t.next_after_name, None);
     }
 
@@ -2534,8 +2550,8 @@ mod tests {
         assert!(invalid_ident_at_cursor("show data Cust", 14, &cache).is_none());
         // `show data Cust` plus a typo: `show data Custp`. No
         // table starts with "Custp" → invalid.
-        let invalid = invalid_ident_at_cursor("show data Custp", 15, &cache)
-            .expect("should be invalid");
+        let invalid =
+            invalid_ident_at_cursor("show data Custp", 15, &cache).expect("should be invalid");
         assert_eq!(invalid.range, (10, 15));
         assert_eq!(invalid.found, "Custp");
         assert_eq!(invalid.source, IdentSource::Tables);
@@ -2600,7 +2616,11 @@ mod tests {
             !cs.iter().any(|c| c == "Existing" || c == "AlsoExisting"),
             "NewName slot must not surface schema candidates; got {cs:?}"
         );
-        assert_eq!(cs, vec!["if".to_string()], "only the advanced IF NOT EXISTS keyword");
+        assert_eq!(
+            cs,
+            vec!["if".to_string()],
+            "only the advanced IF NOT EXISTS keyword"
+        );
     }
 
     fn keyword_cand(text: &str) -> Candidate {
@@ -2791,8 +2811,10 @@ mod tests {
         let cands = candidates_at_cursor(input, input.len(), &cache)
             .expect("some completion")
             .candidates;
-        let count_entries: Vec<_> =
-            cands.iter().filter(|c| c.text.eq_ignore_ascii_case("count")).collect();
+        let count_entries: Vec<_> = cands
+            .iter()
+            .filter(|c| c.text.eq_ignore_ascii_case("count"))
+            .collect();
         assert_eq!(
             count_entries.len(),
             1,
@@ -2805,7 +2827,9 @@ mod tests {
         );
         // A non-colliding function at the same slot is unaffected.
         assert!(
-            cands.iter().any(|c| c.text == "coalesce" && c.kind == CandidateKind::Function),
+            cands
+                .iter()
+                .any(|c| c.text == "coalesce" && c.kind == CandidateKind::Function),
             "non-colliding functions still surface; got {cands:?}",
         );
     }
@@ -2875,8 +2899,10 @@ mod tests {
         let mut s = SchemaCache::default();
         s.tables.push("OrderLines".into());
         s.columns.push("count".into());
-        s.table_columns
-            .insert("OrderLines".into(), vec![TableColumn::new("count", Type::Int)]);
+        s.table_columns.insert(
+            "OrderLines".into(),
+            vec![TableColumn::new("count", Type::Int)],
+        );
         let input = "select sum(ol.count) from OrderLines ol";
         let cursor = input.find("ol.count").unwrap() + 2; // right after `ol`
         assert!(
@@ -2938,15 +2964,35 @@ mod tests {
         s.table_columns.insert(
             "a".to_string(),
             vec![
-                TableColumn { name: "id".to_string(), user_type: Type::Int, not_null: false, has_default: false },
-                TableColumn { name: "name".to_string(), user_type: Type::Text, not_null: false, has_default: false },
+                TableColumn {
+                    name: "id".to_string(),
+                    user_type: Type::Int,
+                    not_null: false,
+                    has_default: false,
+                },
+                TableColumn {
+                    name: "name".to_string(),
+                    user_type: Type::Text,
+                    not_null: false,
+                    has_default: false,
+                },
             ],
         );
         s.table_columns.insert(
             "b".to_string(),
             vec![
-                TableColumn { name: "id".to_string(), user_type: Type::Int, not_null: false, has_default: false },
-                TableColumn { name: "total".to_string(), user_type: Type::Real, not_null: false, has_default: false },
+                TableColumn {
+                    name: "id".to_string(),
+                    user_type: Type::Int,
+                    not_null: false,
+                    has_default: false,
+                },
+                TableColumn {
+                    name: "total".to_string(),
+                    user_type: Type::Real,
+                    not_null: false,
+                    has_default: false,
+                },
             ],
         );
         s
@@ -3191,5 +3237,3 @@ mod tests {
         assert!(candidates_at_cursor_with("create ", 7, &cache, empty_ranker).is_none());
     }
 }
-
-

src/dsl/command.rs

@@ -549,9 +549,16 @@ pub enum AppCommand {
     /// word like `insert` / `create` / `show`, or `types`), the
     /// focused detail for that command (or command group sharing
     /// the entry word).
-    Help {
-        topic: Option<String>,
-    },
+    Help { topic: Option<String> },
+    /// Show a contextual tier-3 hint (H2 / ADR-0053). No argument:
+    /// when submitted, it expands on the most recent runtime error
+    /// (the buffer is empty post-submit). The live-input surface is
+    /// the F1 keybinding, handled in `App::handle_key`, not here.
+    Hint,
+    /// Print the application version (ADR-0054): the in-app twin of the
+    /// `--version` / `-V` CLI flag. Emits `CARGO_PKG_VERSION` — the same
+    /// single source of truth — into the output panel.
+    Version,
     /// Rebuild `playground.db` from `project.yaml` + data/, with
     /// confirmation modal.
     Rebuild,
@@ -571,7 +578,10 @@ pub enum AppCommand {
     /// Unpack a zip into a new project and switch to it.
     /// `target` overrides the project name (default: taken from
     /// the zip).
-    Import { path: String, target: Option<String> },
+    Import {
+        path: String,
+        target: Option<String>,
+    },
     /// Switch the persistent input mode.
     Mode { value: ModeValue },
     /// Show or set the messages verbosity.
@@ -782,9 +792,7 @@ impl PartialEq for Operand {
     fn eq(&self, other: &Self) -> bool {
         match (self, other) {
             (Self::Column { name: a, .. }, Self::Column { name: b, .. }) => a == b,
-            (Self::Literal { value: a, .. }, Self::Literal { value: b, .. }) => {
-                a == b
-            }
+            (Self::Literal { value: a, .. }, Self::Literal { value: b, .. }) => a == b,
             _ => false,
         }
     }
@@ -808,7 +816,9 @@ pub enum CompareOp {
 /// a single row in the metadata table.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum RelationshipSelector {
-    Named { name: String },
+    Named {
+        name: String,
+    },
     Endpoints {
         parent_table: String,
         parent_column: String,
@@ -1013,6 +1023,8 @@ impl Command {
             Self::App(app) => match app {
                 AppCommand::Quit => "quit",
                 AppCommand::Help { .. } => "help",
+                AppCommand::Hint => "hint",
+                AppCommand::Version => "version",
                 AppCommand::Rebuild => "rebuild",
                 AppCommand::Save => "save",
                 AppCommand::SaveAs => "save as",
@@ -1145,9 +1157,7 @@ impl Command {
                     parent_column,
                     child_table,
                     child_column,
-                } => format!(
-                    "from {parent_table}.{parent_column} to {child_table}.{child_column}"
-                ),
+                } => format!("from {parent_table}.{parent_column} to {child_table}.{child_column}"),
             },
             // A constraint command's subject is the dotted
             // `<table>.<column>` it acts on (ADR-0029 §2.2).

src/dsl/grammar/app.rs

@@ -9,8 +9,7 @@
 
 use crate::dsl::command::{AppCommand, Command, CopyScope, MessagesValue, ModeValue};
 use crate::dsl::grammar::{
-    CommandNode, HintMode, IdentSource, IdentValidator, Node, ValidationError,
-    Word,
+    CommandNode, HintMode, IdentSource, IdentValidator, Node, ValidationError, Word,
 };
 use crate::dsl::walker::outcome::{MatchedKind, MatchedPath};
 
@@ -60,19 +59,16 @@ const IMPORT_TARGET_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const IMPORT_TARGET: Node = Node::Hinted {
     mode: HintMode::ForceProse("hint.ambient_typing_name"),
     inner: &IMPORT_TARGET_IDENT,
 };
 
-const IMPORT_AS_TARGET: Node = Node::Seq(&[
-    Node::Word(Word::keyword("as")),
-    IMPORT_TARGET,
-]);
+const IMPORT_AS_TARGET: Node = Node::Seq(&[Node::Word(Word::keyword("as")), IMPORT_TARGET]);
 const IMPORT_AS_TARGET_OPT: Node = Node::Optional(&IMPORT_AS_TARGET);
 
 const IMPORT_PATH_AND_TARGET: Node = Node::Seq(&[Node::BarePath, IMPORT_AS_TARGET_OPT]);
@@ -101,9 +97,9 @@ const MODE_CHOICES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
 ];
 const MODE_VALUE: Node = Node::Choice(MODE_CHOICES);
@@ -119,9 +115,9 @@ const MESSAGES_CHOICES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
 ];
 const MESSAGES_VALUE: Node = Node::Choice(MESSAGES_CHOICES);
@@ -174,9 +170,16 @@ const fn build_rebuild(_path: &MatchedPath, _source: &str) -> Result<Command, Va
     Ok(Command::App(AppCommand::Rebuild))
 }
 
+const fn build_version(_path: &MatchedPath, _source: &str) -> Result<Command, ValidationError> {
+    Ok(Command::App(AppCommand::Version))
+}
+
 const fn build_undo(_path: &MatchedPath, _source: &str) -> Result<Command, ValidationError> {
     Ok(Command::App(AppCommand::Undo))
 }
+const fn build_hint(_path: &MatchedPath, _source: &str) -> Result<Command, ValidationError> {
+    Ok(Command::App(AppCommand::Hint))
+}
 
 const fn build_redo(_path: &MatchedPath, _source: &str) -> Result<Command, ValidationError> {
     Ok(Command::App(AppCommand::Redo))
@@ -263,88 +266,133 @@ pub static QUIT: CommandNode = CommandNode {
     shape: EMPTY_SEQ,
     ast_builder: build_quit,
     help_id: Some("app.quit"),
-    usage_ids: &["parse.usage.quit"],};
+    hint_ids: &["quit"],
+    usage_ids: &["parse.usage.quit"],
+};
 
 pub static HELP: CommandNode = CommandNode {
     entry: Word::keyword("help"),
     shape: HELP_TOPIC_OPT,
     ast_builder: build_help,
     help_id: Some("app.help"),
-    usage_ids: &["parse.usage.help"],};
+    hint_ids: &["help"],
+    usage_ids: &["parse.usage.help"],
+};
+
+pub static HINT: CommandNode = CommandNode {
+    entry: Word::keyword("hint"),
+    shape: EMPTY_SEQ,
+    ast_builder: build_hint,
+    help_id: Some("app.hint"),
+    // hint_id assigned in Phase C with the tier-3 corpus (ADR-0053).
+    hint_ids: &["hint"],
+    usage_ids: &["parse.usage.hint"],
+};
 
 pub static REBUILD: CommandNode = CommandNode {
     entry: Word::keyword("rebuild"),
     shape: EMPTY_SEQ,
     ast_builder: build_rebuild,
     help_id: Some("app.rebuild"),
-    usage_ids: &["parse.usage.rebuild"],};
+    hint_ids: &["rebuild"],
+    usage_ids: &["parse.usage.rebuild"],
+};
+
+pub static VERSION: CommandNode = CommandNode {
+    entry: Word::keyword("version"),
+    shape: EMPTY_SEQ,
+    ast_builder: build_version,
+    help_id: Some("app.version"),
+    hint_ids: &["version"],
+    usage_ids: &["parse.usage.version"],
+};
 
 pub static SAVE: CommandNode = CommandNode {
     entry: Word::keyword("save"),
     shape: SAVE_AS_OPT,
     ast_builder: build_save,
     help_id: Some("app.save"),
-    usage_ids: &["parse.usage.save"],};
+    hint_ids: &["save"],
+    usage_ids: &["parse.usage.save"],
+};
 
 pub static NEW: CommandNode = CommandNode {
     entry: Word::keyword("new"),
     shape: EMPTY_SEQ,
     ast_builder: build_new,
     help_id: Some("app.new"),
-    usage_ids: &["parse.usage.new"],};
+    hint_ids: &["new"],
+    usage_ids: &["parse.usage.new"],
+};
 
 pub static LOAD: CommandNode = CommandNode {
     entry: Word::keyword("load"),
     shape: EMPTY_SEQ,
     ast_builder: build_load,
     help_id: Some("app.load"),
-    usage_ids: &["parse.usage.load"],};
+    hint_ids: &["load"],
+    usage_ids: &["parse.usage.load"],
+};
 
 pub static EXPORT: CommandNode = CommandNode {
     entry: Word::keyword("export"),
     shape: EXPORT_PATH_OPT,
     ast_builder: build_export,
     help_id: Some("app.export"),
-    usage_ids: &["parse.usage.export"],};
+    hint_ids: &["export"],
+    usage_ids: &["parse.usage.export"],
+};
 
 pub static IMPORT: CommandNode = CommandNode {
     entry: Word::keyword("import"),
     shape: IMPORT_BODY_OPT,
     ast_builder: build_import,
     help_id: Some("app.import"),
-    usage_ids: &["parse.usage.import"],};
+    hint_ids: &["import"],
+    usage_ids: &["parse.usage.import"],
+};
 
 pub static MODE: CommandNode = CommandNode {
     entry: Word::keyword("mode"),
     shape: MODE_VALUE,
     ast_builder: build_mode,
     help_id: Some("app.mode"),
-    usage_ids: &["parse.usage.mode"],};
+    hint_ids: &["mode"],
+    usage_ids: &["parse.usage.mode"],
+};
 
 pub static MESSAGES: CommandNode = CommandNode {
     entry: Word::keyword("messages"),
     shape: MESSAGES_VALUE_OPT,
     ast_builder: build_messages,
     help_id: Some("app.messages"),
-    usage_ids: &["parse.usage.messages"],};
+    hint_ids: &["messages"],
+    usage_ids: &["parse.usage.messages"],
+};
 
 pub static UNDO: CommandNode = CommandNode {
     entry: Word::keyword("undo"),
     shape: EMPTY_SEQ,
     ast_builder: build_undo,
     help_id: Some("app.undo"),
-    usage_ids: &["parse.usage.undo"],};
+    hint_ids: &["undo"],
+    usage_ids: &["parse.usage.undo"],
+};
 
 pub static REDO: CommandNode = CommandNode {
     entry: Word::keyword("redo"),
     shape: EMPTY_SEQ,
     ast_builder: build_redo,
     help_id: Some("app.redo"),
-    usage_ids: &["parse.usage.redo"],};
+    hint_ids: &["redo"],
+    usage_ids: &["parse.usage.redo"],
+};
 
 pub static COPY: CommandNode = CommandNode {
     entry: Word::keyword("copy"),
     shape: COPY_VALUE_OPT,
     ast_builder: build_copy,
     help_id: Some("app.copy"),
-    usage_ids: &["parse.usage.copy"],};
+    hint_ids: &["copy"],
+    usage_ids: &["parse.usage.copy"],
+};

src/dsl/grammar/data.rs

@@ -24,19 +24,17 @@
 //! later swap that capture for the same typed slots used here, adding
 //! live hints/highlighting.
 
-use crate::dsl::command::{
-    Command, Expr, RowFilter, SeedOverride, SeedOverrideKind, ShowListKind,
-};
+use crate::dsl::command::{Command, Expr, RowFilter, SeedOverride, SeedOverrideKind, ShowListKind};
 use crate::dsl::grammar::{
     CommandNode, IdentSource, Node, NumberValidator, ValidationError, Word, expr,
     shared::{
-        FALLBACK_VALUE_LIST, column_value_list, count_tuple_values,
-        current_column_value, insert_target_columns,
+        FALLBACK_VALUE_LIST, column_value_list, count_tuple_values, current_column_value,
+        insert_target_columns,
     },
     sql_delete, sql_insert, sql_select, sql_update,
 };
-use crate::dsl::walker::context::WalkContext;
 use crate::dsl::value::Value;
+use crate::dsl::walker::context::WalkContext;
 use crate::dsl::walker::outcome::{MatchedItem, MatchedKind, MatchedPath};
 
 // =================================================================
@@ -56,10 +54,10 @@ const TABLE_NAME_EXISTING: Node = Node::Ident {
     highlight_override: None,
     writes_table: false,
     writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 /// Table-name slot variant that populates
@@ -75,10 +73,10 @@ const TABLE_NAME_INSERT: Node = Node::Ident {
     highlight_override: None,
     writes_table: true,
     writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 // =================================================================
@@ -95,10 +93,7 @@ const SHOW_DATA_NODES: &[Node] = &[
 ];
 const SHOW_DATA: Node = Node::Seq(SHOW_DATA_NODES);
 
-const SHOW_TABLE_NODES: &[Node] = &[
-    Node::Word(Word::keyword("table")),
-    TABLE_NAME_EXISTING,
-];
+const SHOW_TABLE_NODES: &[Node] = &[Node::Word(Word::keyword("table")), TABLE_NAME_EXISTING];
 const SHOW_TABLE: Node = Node::Seq(SHOW_TABLE_NODES);
 
 // `show tables` / `show relationships` / `show indexes` — the
@@ -144,8 +139,7 @@ const SHOW_INDEX_NAME: Node = Node::Ident {
     writes_cte_name: false,
     writes_projection_alias: false,
 };
-const SHOW_INDEX_NODES: &[Node] =
-    &[Node::Word(Word::keyword("index")), SHOW_INDEX_NAME];
+const SHOW_INDEX_NODES: &[Node] = &[Node::Word(Word::keyword("index")), SHOW_INDEX_NAME];
 const SHOW_INDEX: Node = Node::Seq(SHOW_INDEX_NODES);
 
 const SHOW_CHOICES: &[Node] = &[
@@ -192,9 +186,9 @@ static FORM_A_COLUMN: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: true,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 static INSERT_COMMA: Node = Node::Punct(',');
 
@@ -224,8 +218,7 @@ fn insert_first_paren(ctx: &WalkContext, source: &str, pos: usize) -> Node {
 /// or an identifier-shaped token (a column name) returns false.
 fn first_paren_item_is_value_literal(source: &str, pos: usize) -> bool {
     use crate::dsl::walker::lex_helpers::{
-        consume_ident, consume_number_literal, consume_string_literal,
-        skip_whitespace,
+        consume_ident, consume_number_literal, consume_string_literal, skip_whitespace,
     };
     let p = skip_whitespace(source, pos);
     if p >= source.len() {
@@ -281,7 +274,11 @@ fn dsl_insert_value_list(ctx: &WalkContext, source: &str, pos: usize) -> Node {
         return FALLBACK_VALUE_LIST;
     };
     let (count, closed) = count_tuple_values(source, pos);
-    let arity_ok = if closed { count == cols.len() } else { count <= cols.len() };
+    let arity_ok = if closed {
+        count == cols.len()
+    } else {
+        count <= cols.len()
+    };
     if arity_ok {
         Node::DynamicSubgrammar(column_value_list)
     } else {
@@ -320,8 +317,7 @@ const INSERT_VALUES_KEYWORD_FIRST_NODES: &[Node] = &[
 ];
 const INSERT_VALUES_KEYWORD_FIRST: Node = Node::Seq(INSERT_VALUES_KEYWORD_FIRST_NODES);
 
-const INSERT_AFTER_TABLE_CHOICES: &[Node] =
-    &[INSERT_VALUES_KEYWORD_FIRST, INSERT_PAREN_FIRST];
+const INSERT_AFTER_TABLE_CHOICES: &[Node] = &[INSERT_VALUES_KEYWORD_FIRST, INSERT_PAREN_FIRST];
 const INSERT_AFTER_TABLE: Node = Node::Choice(INSERT_AFTER_TABLE_CHOICES);
 
 const INSERT_NODES: &[Node] = &[
@@ -349,10 +345,10 @@ const TABLE_NAME_WRITES: Node = Node::Ident {
     highlight_override: None,
     writes_table: true,
     writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 /// Column-name slot in `set col = …` — resolves the column's
@@ -366,9 +362,9 @@ const SET_COLUMN: Node = Node::Ident {
     writes_table: false,
     writes_column: true,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 /// Value slot resolved at walk time from
@@ -376,11 +372,7 @@ writes_projection_alias: false,
 /// value-literal choice when no current_column is bound.
 const PER_COLUMN_VALUE: Node = Node::DynamicSubgrammar(current_column_value);
 
-const UPDATE_ASSIGNMENT_NODES: &[Node] = &[
-    SET_COLUMN,
-    Node::Punct('='),
-    PER_COLUMN_VALUE,
-];
+const UPDATE_ASSIGNMENT_NODES: &[Node] = &[SET_COLUMN, Node::Punct('='), PER_COLUMN_VALUE];
 const UPDATE_ASSIGNMENT: Node = Node::Seq(UPDATE_ASSIGNMENT_NODES);
 const UPDATE_ASSIGNMENTS: Node = Node::Repeated {
     inner: &UPDATE_ASSIGNMENT,
@@ -568,8 +560,7 @@ const SEED_OVERRIDES: Node = Node::Repeated {
     separator: Some(&Node::Punct(',')),
     min: 1,
 };
-const SEED_SET_CLAUSE_NODES: &[Node] =
-    &[Node::Word(Word::keyword("set")), SEED_OVERRIDES];
+const SEED_SET_CLAUSE_NODES: &[Node] = &[Node::Word(Word::keyword("set")), SEED_OVERRIDES];
 const SEED_SET_CLAUSE: Node = Node::Seq(SEED_SET_CLAUSE_NODES);
 
 const SEED_NODES: &[Node] = &[
@@ -980,7 +971,10 @@ fn parse_seed_override_tail(
         MatchedKind::Word("in") => {
             *i += 1; // `in`
             // `(`
-            if matches!(region.get(*i).map(|t| &t.kind), Some(MatchedKind::Punct('('))) {
+            if matches!(
+                region.get(*i).map(|t| &t.kind),
+                Some(MatchedKind::Punct('('))
+            ) {
                 *i += 1;
             }
             let mut values = Vec::new();
@@ -1001,7 +995,10 @@ fn parse_seed_override_tail(
         MatchedKind::Word("between") => {
             *i += 1; // `between`
             let low = seed_take_value(region, i, column)?;
-            if matches!(region.get(*i).map(|t| &t.kind), Some(MatchedKind::Word("and"))) {
+            if matches!(
+                region.get(*i).map(|t| &t.kind),
+                Some(MatchedKind::Word("and"))
+            ) {
                 *i += 1;
             }
             let high = seed_take_value(region, i, column)?;
@@ -1011,7 +1008,15 @@ fn parse_seed_override_tail(
             *i += 1; // `as`
             let gen_item = region
                 .get(*i)
-                .filter(|t| matches!(t.kind, MatchedKind::Ident { role: "seed_generator", .. }))
+                .filter(|t| {
+                    matches!(
+                        t.kind,
+                        MatchedKind::Ident {
+                            role: "seed_generator",
+                            ..
+                        }
+                    )
+                })
                 .ok_or_else(|| seed_set_error(column))?;
             *i += 1;
             Ok(SeedOverrideKind::Generator(gen_item.text.clone()))
@@ -1085,7 +1090,15 @@ fn build_insert(path: &MatchedPath, _source: &str) -> Result<Command, Validation
     let table_idx = path
         .items
         .iter()
-        .position(|i| matches!(&i.kind, MatchedKind::Ident { role: "table_name", .. }))
+        .position(|i| {
+            matches!(
+                &i.kind,
+                MatchedKind::Ident {
+                    role: "table_name",
+                    ..
+                }
+            )
+        })
         .ok_or_else(|| ValidationError {
             message_key: "parse.error_wrapper",
             args: vec![("detail", "missing table".to_string())],
@@ -1141,7 +1154,10 @@ fn build_insert(path: &MatchedPath, _source: &str) -> Result<Command, Validation
         if columns.is_empty() {
             return Err(ValidationError {
                 message_key: "parse.error_wrapper",
-                args: vec![("detail", "expected column names in `insert into T (…)`".to_string())],
+                args: vec![(
+                    "detail",
+                    "expected column names in `insert into T (…)`".to_string(),
+                )],
             });
         }
         // Find the `values` keyword and the next `(` — the values
@@ -1247,9 +1263,7 @@ fn build_update(path: &MatchedPath, _source: &str) -> Result<Command, Validation
     })
 }
 
-fn collect_assignments(
-    path: &MatchedPath,
-) -> Result<Vec<(String, Value)>, ValidationError> {
+fn collect_assignments(path: &MatchedPath) -> Result<Vec<(String, Value)>, ValidationError> {
     let mut out = Vec::new();
     let mut iter = path.items.iter();
     while let Some(item) = iter.next() {
@@ -1495,9 +1509,7 @@ fn build_sql_insert(path: &MatchedPath, source: &str) -> Result<Command, Validat
     let row_source = path
         .items
         .iter()
-        .find(|item| {
-            matches!(item.kind, MatchedKind::Word("values" | "select" | "with"))
-        })
+        .find(|item| matches!(item.kind, MatchedKind::Word("values" | "select" | "with")))
         .map(|item| {
             let end = tail_start.unwrap_or(source.len());
             source[item.span.0..end]
@@ -1790,6 +1802,13 @@ pub static SHOW: CommandNode = CommandNode {
     shape: SHOW_SHAPE,
     ast_builder: build_show,
     help_id: Some("data.show"),
+    hint_ids: &[
+        "show_data",
+        "show_table",
+        "show_tables",
+        "show_relationships",
+        "show_indexes",
+    ],
     usage_ids: &[
         "parse.usage.show_data",
         "parse.usage.show_table",
@@ -1798,13 +1817,15 @@ pub static SHOW: CommandNode = CommandNode {
         "parse.usage.show_indexes",
         "parse.usage.show_relationship",
         "parse.usage.show_index",
-    ],};
+    ],
+};
 
 pub static SEED: CommandNode = CommandNode {
     entry: Word::keyword("seed"),
     shape: SEED_SHAPE,
     ast_builder: build_seed,
     help_id: Some("data.seed"),
+    hint_ids: &["seed"],
     usage_ids: &["parse.usage.seed"],
 };
 
@@ -1813,35 +1834,46 @@ pub static INSERT: CommandNode = CommandNode {
     shape: INSERT_SHAPE,
     ast_builder: build_insert,
     help_id: Some("data.insert"),
-    usage_ids: &["parse.usage.insert"],};
+    // ADR-0053 Phase-B exemplar.
+    hint_ids: &["insert"],
+    usage_ids: &["parse.usage.insert"],
+};
 
 pub static UPDATE: CommandNode = CommandNode {
     entry: Word::keyword("update"),
     shape: UPDATE_SHAPE,
     ast_builder: build_update,
     help_id: Some("data.update"),
-    usage_ids: &["parse.usage.update"],};
+    hint_ids: &["update"],
+    usage_ids: &["parse.usage.update"],
+};
 
 pub static DELETE: CommandNode = CommandNode {
     entry: Word::keyword("delete"),
     shape: DELETE_SHAPE,
     ast_builder: build_delete,
     help_id: Some("data.delete"),
-    usage_ids: &["parse.usage.delete"],};
+    hint_ids: &["delete"],
+    usage_ids: &["parse.usage.delete"],
+};
 
 pub static REPLAY: CommandNode = CommandNode {
     entry: Word::keyword("replay"),
     shape: REPLAY_PATH,
     ast_builder: build_replay,
     help_id: Some("data.replay"),
-    usage_ids: &["parse.usage.replay"],};
+    hint_ids: &["replay"],
+    usage_ids: &["parse.usage.replay"],
+};
 
 pub static EXPLAIN: CommandNode = CommandNode {
     entry: Word::keyword("explain"),
     shape: EXPLAIN_SHAPE,
     ast_builder: build_explain,
     help_id: Some("data.explain"),
-    usage_ids: &["parse.usage.explain"],};
+    hint_ids: &["explain"],
+    usage_ids: &["parse.usage.explain"],
+};
 
 /// `explain` over advanced-mode SQL (ADR-0039).
 ///
@@ -1860,7 +1892,9 @@ pub static EXPLAIN_SQL: CommandNode = CommandNode {
     // too). Mirrors the `SQL_INSERT`/`SQL_UPDATE`/`SQL_DELETE`
     // precedent; otherwise `note_help` would print `explain` twice.
     help_id: None,
-    usage_ids: &[],};
+    hint_ids: &["explain_sql"],
+    usage_ids: &[],
+};
 
 /// SQL `SELECT` (ADR-0030 §6, ADR-0031, ADR-0032).
 ///
@@ -1875,7 +1909,9 @@ pub static SELECT: CommandNode = CommandNode {
     shape: Node::Subgrammar(&sql_select::SQL_SELECT_TAIL),
     ast_builder: build_select,
     help_id: None,
-    usage_ids: &["parse.usage.select"],};
+    hint_ids: &["select"],
+    usage_ids: &["parse.usage.select"],
+};
 
 /// `WITH …` top-level statement (ADR-0032 §4 / sub-phase 2c).
 ///
@@ -1889,7 +1925,9 @@ pub static WITH: CommandNode = CommandNode {
     shape: Node::Subgrammar(&sql_select::SQL_WITH_TAIL),
     ast_builder: build_select,
     help_id: None,
-    usage_ids: &["parse.usage.with"],};
+    hint_ids: &["with"],
+    usage_ids: &["parse.usage.with"],
+};
 
 /// SQL `INSERT` — the `Advanced`-category node of the shared
 /// `insert` entry word (ADR-0033 §2, Amendment 1, sub-phase 3j).
@@ -1906,6 +1944,7 @@ pub static SQL_INSERT: CommandNode = CommandNode {
     shape: Node::Subgrammar(&sql_insert::SQL_INSERT_SHAPE),
     ast_builder: build_sql_insert,
     help_id: None,
+    hint_ids: &["sql_insert"],
     usage_ids: &[],
 };
 
@@ -1919,6 +1958,7 @@ pub static SQL_UPDATE: CommandNode = CommandNode {
     shape: Node::Subgrammar(&sql_update::SQL_UPDATE_SHAPE),
     ast_builder: build_sql_update,
     help_id: None,
+    hint_ids: &["sql_update"],
     usage_ids: &[],
 };
 
@@ -1934,6 +1974,7 @@ pub static SQL_DELETE: CommandNode = CommandNode {
     shape: Node::Subgrammar(&sql_delete::SQL_DELETE_SHAPE),
     ast_builder: build_sql_delete,
     help_id: None,
+    hint_ids: &["sql_delete"],
     usage_ids: &[],
 };
 
@@ -1973,7 +2014,11 @@ mod explain_tests {
     #[test]
     fn explain_show_data_carries_where_and_limit_through() {
         match explain_inner("explain show data Customers where id = 1 limit 5") {
-            Command::ShowData { name, filter, limit } => {
+            Command::ShowData {
+                name,
+                filter,
+                limit,
+            } => {
                 assert_eq!(name, "Customers");
                 assert!(filter.is_some(), "where clause should survive");
                 assert_eq!(limit, Some(5));
@@ -2032,9 +2077,7 @@ mod explain_tests {
 
     /// Advanced-mode counterpart of `explain_inner`.
     fn explain_inner_adv(input: &str) -> Command {
-        match parse_command_in_mode(input, Mode::Advanced)
-            .expect("advanced explain should parse")
-        {
+        match parse_command_in_mode(input, Mode::Advanced).expect("advanced explain should parse") {
             Command::Explain { query } => *query,
             other => panic!("expected Command::Explain, got {other:?}"),
         }
@@ -2065,7 +2108,9 @@ mod explain_tests {
     #[test]
     fn explain_sql_insert_wraps_a_sql_insert() {
         match explain_inner_adv("explain insert into Customers values (1, 'Bo')") {
-            Command::SqlInsert { sql, target_table, .. } => {
+            Command::SqlInsert {
+                sql, target_table, ..
+            } => {
                 assert_eq!(target_table, "Customers");
                 assert_eq!(sql, "insert into Customers values (1, 'Bo')");
             }
@@ -2076,7 +2121,9 @@ mod explain_tests {
     #[test]
     fn explain_sql_update_wraps_a_sql_update_with_clean_sql() {
         match explain_inner_adv("explain update Customers set Name = 'Bo' where id = 1") {
-            Command::SqlUpdate { sql, target_table, .. } => {
+            Command::SqlUpdate {
+                sql, target_table, ..
+            } => {
                 assert_eq!(target_table, "Customers");
                 assert_eq!(sql, "update Customers set Name = 'Bo' where id = 1");
             }
@@ -2087,7 +2134,9 @@ mod explain_tests {
     #[test]
     fn explain_sql_delete_wraps_a_sql_delete() {
         match explain_inner_adv("explain delete from Customers where id = 1") {
-            Command::SqlDelete { sql, target_table, .. } => {
+            Command::SqlDelete {
+                sql, target_table, ..
+            } => {
                 assert_eq!(target_table, "Customers");
                 assert_eq!(sql, "delete from Customers where id = 1");
             }
@@ -2128,11 +2177,7 @@ mod explain_tests {
     fn explain_does_not_cover_ddl() {
         // EXPLAIN QUERY PLAN applies to DML/queries only (ADR-0039
         // out of scope); there is no SQL DDL branch under explain.
-        assert!(parse_command_in_mode(
-            "explain create table T (id int)",
-            Mode::Advanced,
-        )
-        .is_err());
+        assert!(parse_command_in_mode("explain create table T (id int)", Mode::Advanced,).is_err());
     }
 
     #[test]
@@ -2145,9 +2190,8 @@ mod explain_tests {
         use crate::completion::candidates_at_cursor_in_mode;
         let schema = crate::completion::SchemaCache::default();
         let input = "explain ";
-        let completion =
-            candidates_at_cursor_in_mode(input, input.len(), &schema, Mode::Advanced)
-                .expect("explain offers candidates");
+        let completion = candidates_at_cursor_in_mode(input, input.len(), &schema, Mode::Advanced)
+            .expect("explain offers candidates");
         let names: Vec<&str> = completion
             .candidates
             .iter()
@@ -2158,4 +2202,3 @@ mod explain_tests {
         }
     }
 }
-

src/dsl/grammar/ddl.rs

@@ -16,11 +16,11 @@ use crate::dsl::command::{
     AlterTableAction, ChangeColumnMode, ColumnSpec, Command, Constraint, ConstraintKind, Expr,
     IndexSelector, RelationshipSelector, SqlForeignKey, TableConstraint,
 };
-use crate::dsl::value::Value;
 use crate::dsl::grammar::{
     CommandNode, HighlightClass, HintMode, IdentSource, Node, ValidationError, Word,
     shared::{REFERENTIAL_CLAUSES, TYPE_SLOT, TYPE_VALIDATOR},
 };
+use crate::dsl::value::Value;
 
 /// `HintMode` annotation shared by every `NewName` ident slot:
 /// the user is inventing a name, so the hint panel forces the
@@ -39,12 +39,12 @@ const TABLE_NAME_NEW_IDENT: Node = Node::Ident {
     role: "table_name",
     validator: None,
     highlight_override: None,
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const TABLE_NAME_NEW: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -63,12 +63,12 @@ const TABLE_NAME_EXISTING: Node = Node::Ident {
     role: "table_name",
     validator: None,
     highlight_override: None,
-        writes_table: true,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: true,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 const COLUMN_NAME: Node = Node::Ident {
@@ -76,12 +76,12 @@ const COLUMN_NAME: Node = Node::Ident {
     role: "column_name",
     validator: None,
     highlight_override: None,
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 const COLUMN_NAME_NEW_IDENT: Node = Node::Ident {
@@ -89,12 +89,12 @@ const COLUMN_NAME_NEW_IDENT: Node = Node::Ident {
     role: "column_name",
     validator: None,
     highlight_override: None,
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const COLUMN_NAME_NEW: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -106,12 +106,12 @@ const RELATIONSHIP_NAME: Node = Node::Ident {
     role: "relationship_name",
     validator: None,
     highlight_override: None,
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 const RELATIONSHIP_NAME_NEW_IDENT: Node = Node::Ident {
@@ -119,12 +119,12 @@ const RELATIONSHIP_NAME_NEW_IDENT: Node = Node::Ident {
     role: "relationship_name",
     validator: None,
     highlight_override: None,
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const RELATIONSHIP_NAME_NEW: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -139,9 +139,9 @@ const INDEX_NAME_EXISTING: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 const INDEX_NAME_NEW_IDENT: Node = Node::Ident {
@@ -152,9 +152,9 @@ const INDEX_NAME_NEW_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const INDEX_NAME_NEW: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -181,10 +181,7 @@ const TABLE_OPT: Node = Node::Optional(&Node::Word(Word::keyword("table")));
 // drop_table — `drop table <T>`
 // =================================================================
 
-const DROP_TABLE_NODES: &[Node] = &[
-    Node::Word(Word::keyword("table")),
-    TABLE_NAME_EXISTING,
-];
+const DROP_TABLE_NODES: &[Node] = &[Node::Word(Word::keyword("table")), TABLE_NAME_EXISTING];
 const DROP_TABLE: Node = Node::Seq(DROP_TABLE_NODES);
 
 // Advanced-mode SQL `DROP TABLE [IF EXISTS] <name> [;]` (ADR-0035 §4,
@@ -192,8 +189,10 @@ const DROP_TABLE: Node = Node::Seq(DROP_TABLE_NODES);
 // plus the optional `IF EXISTS` no-op-with-note. The leading concrete
 // `table` keyword (not the Optional) keeps the element/dispatch
 // matching honest.
-static SQL_DROP_IF_EXISTS_NODES: &[Node] =
-    &[Node::Word(Word::keyword("if")), Node::Word(Word::keyword("exists"))];
+static SQL_DROP_IF_EXISTS_NODES: &[Node] = &[
+    Node::Word(Word::keyword("if")),
+    Node::Word(Word::keyword("exists")),
+];
 const SQL_DROP_IF_EXISTS_OPT: Node = Node::Optional(&Node::Seq(SQL_DROP_IF_EXISTS_NODES));
 static SQL_DROP_TABLE_SHAPE_NODES: &[Node] = &[
     Node::Word(Word::keyword("table")),
@@ -257,9 +256,9 @@ const DR_PARENT_NODES: &[Node] = &[
         writes_table: true,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
     Node::Punct('.'),
     Node::Ident {
@@ -270,9 +269,9 @@ const DR_PARENT_NODES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
 ];
 const DR_PARENT: Node = Node::Seq(DR_PARENT_NODES);
@@ -286,9 +285,9 @@ const DR_CHILD_NODES: &[Node] = &[
         writes_table: true,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
     Node::Punct('.'),
     Node::Ident {
@@ -299,9 +298,9 @@ const DR_CHILD_NODES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
 ];
 const DR_CHILD: Node = Node::Seq(DR_CHILD_NODES);
@@ -317,10 +316,7 @@ const DR_ENDPOINTS: Node = Node::Seq(DR_ENDPOINTS_NODES);
 const DR_SELECTOR_CHOICES: &[Node] = &[DR_ENDPOINTS, RELATIONSHIP_NAME];
 const DR_SELECTOR: Node = Node::Choice(DR_SELECTOR_CHOICES);
 
-const DROP_RELATIONSHIP_NODES: &[Node] = &[
-    Node::Word(Word::keyword("relationship")),
-    DR_SELECTOR,
-];
+const DROP_RELATIONSHIP_NODES: &[Node] = &[Node::Word(Word::keyword("relationship")), DR_SELECTOR];
 const DROP_RELATIONSHIP: Node = Node::Seq(DROP_RELATIONSHIP_NODES);
 
 // =================================================================
@@ -341,18 +337,20 @@ const DI_POSITIONAL: Node = Node::Seq(DI_POSITIONAL_NODES);
 const DI_SELECTOR_CHOICES: &[Node] = &[DI_POSITIONAL, INDEX_NAME_EXISTING];
 const DI_SELECTOR: Node = Node::Choice(DI_SELECTOR_CHOICES);
 
-const DROP_INDEX_NODES: &[Node] = &[
-    Node::Word(Word::keyword("index")),
-    DI_SELECTOR,
-];
+const DROP_INDEX_NODES: &[Node] = &[Node::Word(Word::keyword("index")), DI_SELECTOR];
 const DROP_INDEX: Node = Node::Seq(DROP_INDEX_NODES);
 
 // =================================================================
 // drop entry — `drop (table|column|relationship|index) ...`
 // =================================================================
 
-const DROP_CHOICES: &[Node] =
-    &[DROP_COLUMN, DROP_RELATIONSHIP, DROP_TABLE, DROP_INDEX, DROP_CONSTRAINT];
+const DROP_CHOICES: &[Node] = &[
+    DROP_COLUMN,
+    DROP_RELATIONSHIP,
+    DROP_TABLE,
+    DROP_INDEX,
+    DROP_CONSTRAINT,
+];
 const DROP_SHAPE: Node = Node::Choice(DROP_CHOICES);
 
 // =================================================================
@@ -450,8 +448,7 @@ const AR_CHILD_COL_LIST: Node = Node::Repeated {
     separator: Some(&Node::Punct(',')),
     min: 1,
 };
-const AR_CHILD_COLS_PAREN_NODES: &[Node] =
-    &[Node::Punct('('), AR_CHILD_COL_LIST, Node::Punct(')')];
+const AR_CHILD_COLS_PAREN_NODES: &[Node] = &[Node::Punct('('), AR_CHILD_COL_LIST, Node::Punct(')')];
 const AR_CHILD_COLS_PAREN: Node = Node::Seq(AR_CHILD_COLS_PAREN_NODES);
 const AR_CHILD_COLS_CHOICES: &[Node] = &[AR_CHILD_COLS_PAREN, AR_CHILD_COL];
 const AR_CHILD_COLS: Node = Node::Choice(AR_CHILD_COLS_CHOICES);
@@ -474,10 +471,7 @@ const AR_CHILD_NODES: &[Node] = &[
 ];
 const AR_CHILD: Node = Node::Seq(AR_CHILD_NODES);
 
-const AR_AS_NAME_NODES: &[Node] = &[
-    Node::Word(Word::keyword("as")),
-    RELATIONSHIP_NAME_NEW,
-];
+const AR_AS_NAME_NODES: &[Node] = &[Node::Word(Word::keyword("as")), RELATIONSHIP_NAME_NEW];
 const AR_AS_NAME_OPT: Node = Node::Optional(&Node::Seq(AR_AS_NAME_NODES));
 
 const AR_CREATE_FK_OPT: Node = Node::Optional(&Node::Flag("create-fk"));
@@ -501,10 +495,7 @@ const ADD_RELATIONSHIP: Node = Node::Seq(ADD_RELATIONSHIP_NODES);
 // add_index — `add index [as <name>] on <T> (<col>, …)`
 // =================================================================
 
-const AI_AS_NAME_NODES: &[Node] = &[
-    Node::Word(Word::keyword("as")),
-    INDEX_NAME_NEW,
-];
+const AI_AS_NAME_NODES: &[Node] = &[Node::Word(Word::keyword("as")), INDEX_NAME_NEW];
 const AI_AS_NAME_OPT: Node = Node::Optional(&Node::Seq(AI_AS_NAME_NODES));
 
 const ADD_INDEX_NODES: &[Node] = &[
@@ -537,9 +528,9 @@ const NEW_COLUMN_NAME_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const NEW_COLUMN_NAME: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -563,10 +554,7 @@ const RENAME_COLUMN: Node = Node::Seq(RENAME_COLUMN_NODES);
 //                  ( <type> ) [--force-conversion | --dont-convert]`
 // =================================================================
 
-const CHANGE_FLAG_CHOICES: &[Node] = &[
-    Node::Flag("force-conversion"),
-    Node::Flag("dont-convert"),
-];
+const CHANGE_FLAG_CHOICES: &[Node] = &[Node::Flag("force-conversion"), Node::Flag("dont-convert")];
 const CHANGE_FLAG_OPT: Node = Node::Repeated {
     inner: &Node::Choice(CHANGE_FLAG_CHOICES),
     separator: None,
@@ -732,8 +720,7 @@ fn build_add(path: &MatchedPath, _source: &str) -> Result<Command, ValidationErr
                     message_key: "parse.error_wrapper",
                     args: vec![("detail", "unknown type".to_string())],
                 })?;
-            let (not_null, unique, default, check) =
-                collect_column_constraints(path)?;
+            let (not_null, unique, default, check) = collect_column_constraints(path)?;
             Ok(Command::AddColumn {
                 table: require_ident(path, "table_name")?,
                 column: require_ident(path, "column_name")?,
@@ -949,7 +936,10 @@ fn build_drop_constraint(path: &MatchedPath, _source: &str) -> Result<Command, V
     } else {
         return Err(ValidationError {
             message_key: "parse.error_wrapper",
-            args: vec![("detail", "drop constraint needs a constraint kind".to_string())],
+            args: vec![(
+                "detail",
+                "drop constraint needs a constraint kind".to_string(),
+            )],
         });
     };
     Ok(Command::DropConstraint {
@@ -968,39 +958,62 @@ pub static DROP: CommandNode = CommandNode {
     shape: DROP_SHAPE,
     ast_builder: build_drop,
     help_id: Some("ddl.drop"),
+    hint_ids: &[
+        "drop_table",
+        "drop_column",
+        "drop_relationship",
+        "drop_index",
+        "drop_constraint",
+    ],
     usage_ids: &[
         "parse.usage.drop_table",
         "parse.usage.drop_column",
         "parse.usage.drop_relationship",
         "parse.usage.drop_index",
         "parse.usage.drop_constraint",
-    ],};
+    ],
+};
 
 pub static ADD: CommandNode = CommandNode {
     entry: Word::keyword("add"),
     shape: ADD_SHAPE,
     ast_builder: build_add,
     help_id: Some("ddl.add"),
+    // Per-form (ADR-0053 D3): every form is listed so the form-word
+    // disambiguation resolves correctly; forms without an authored
+    // block yet fall back to tier-2 at render. `add_relationship` is
+    // authored as a Phase-B exemplar.
+    hint_ids: &[
+        "add_column",
+        "add_relationship",
+        "add_index",
+        "add_constraint",
+    ],
     usage_ids: &[
         "parse.usage.add_column",
         "parse.usage.add_relationship",
         "parse.usage.add_index",
         "parse.usage.add_constraint",
-    ],};
+    ],
+};
 
 pub static RENAME: CommandNode = CommandNode {
     entry: Word::keyword("rename"),
     shape: RENAME_COLUMN,
     ast_builder: build_rename_column,
     help_id: Some("ddl.rename"),
-    usage_ids: &["parse.usage.rename_column"],};
+    hint_ids: &["rename_column"],
+    usage_ids: &["parse.usage.rename_column"],
+};
 
 pub static CHANGE: CommandNode = CommandNode {
     entry: Word::keyword("change"),
     shape: CHANGE_COLUMN,
     ast_builder: build_change_column,
     help_id: Some("ddl.change"),
-    usage_ids: &["parse.usage.change_column"],};
+    hint_ids: &["change_column"],
+    usage_ids: &["parse.usage.change_column"],
+};
 
 // =================================================================
 // create_table — `create table <Name> [with pk [<col>(<type>)[, ...]]]`
@@ -1015,9 +1028,9 @@ const COL_NAME_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 const COL_NAME: Node = Node::Hinted {
     mode: NEW_NAME_HINT,
@@ -1055,8 +1068,12 @@ const CHECK_CONSTRAINT_NODES: &[Node] = &[
 ];
 const CHECK_CONSTRAINT: Node = Node::Seq(CHECK_CONSTRAINT_NODES);
 
-const COLUMN_CONSTRAINT_CHOICES: &[Node] =
-    &[NOT_NULL_CONSTRAINT, UNIQUE_CONSTRAINT, DEFAULT_CONSTRAINT, CHECK_CONSTRAINT];
+const COLUMN_CONSTRAINT_CHOICES: &[Node] = &[
+    NOT_NULL_CONSTRAINT,
+    UNIQUE_CONSTRAINT,
+    DEFAULT_CONSTRAINT,
+    CHECK_CONSTRAINT,
+];
 const COLUMN_CONSTRAINT: Node = Node::Choice(COLUMN_CONSTRAINT_CHOICES);
 
 /// Zero-or-more constraints — the suffix after a column's
@@ -1095,8 +1112,7 @@ const DROP_CONSTRAINT_KIND: Node = Node::Choice(DROP_CONSTRAINT_KIND_CHOICES);
 // `writes_table: true` on the table ident (via `TABLE_NAME_
 // EXISTING`) narrows the `.<column>` slot's completion
 // candidates to that table's columns.
-const CONSTRAINT_TARGET_NODES: &[Node] =
-    &[TABLE_NAME_EXISTING, Node::Punct('.'), COLUMN_NAME];
+const CONSTRAINT_TARGET_NODES: &[Node] = &[TABLE_NAME_EXISTING, Node::Punct('.'), COLUMN_NAME];
 const CONSTRAINT_TARGET: Node = Node::Seq(CONSTRAINT_TARGET_NODES);
 
 const ADD_CONSTRAINT_NODES: &[Node] = &[
@@ -1126,9 +1142,9 @@ const COL_SPEC_NODES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
     Node::Punct(')'),
     COLUMN_CONSTRAINT_SUFFIX,
@@ -1256,10 +1272,14 @@ fn build_create_table(path: &MatchedPath, _source: &str) -> Result<Command, Vali
     let mut items = path.items.iter().peekable();
     while let Some(item) = items.next() {
         match &item.kind {
-            MatchedKind::Ident { role: "col_name", .. } => {
+            MatchedKind::Ident {
+                role: "col_name", ..
+            } => {
                 pending_name = Some(item.text.clone());
             }
-            MatchedKind::Ident { role: "col_type", .. } => {
+            MatchedKind::Ident {
+                role: "col_type", ..
+            } => {
                 let ty = item.text.parse::<Type>().map_err(|_| ValidationError {
                     message_key: "parse.error_wrapper",
                     args: vec![("detail", "unknown type".to_string())],
@@ -1360,7 +1380,9 @@ pub static CREATE: CommandNode = CommandNode {
     shape: CREATE_TABLE,
     ast_builder: build_create_table,
     help_id: Some("ddl.create"),
-    usage_ids: &["parse.usage.create_table"],};
+    hint_ids: &["create_table"],
+    usage_ids: &["parse.usage.create_table"],
+};
 
 // =================================================================
 // create_m2n — `create m:n relationship from <T1> to <T2> [as <name>]`
@@ -1428,6 +1450,7 @@ pub static CREATE_M2N: CommandNode = CommandNode {
     shape: CREATE_M2N_SHAPE,
     ast_builder: build_create_m2n,
     help_id: Some("ddl.create_m2n"),
+    hint_ids: &["create_m2n"],
     usage_ids: &["parse.usage.create_m2n"],
 };
 
@@ -1485,11 +1508,15 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
     while let Some(item) = items.next() {
         match &item.kind {
             // A column name stashes until its type finalises the spec.
-            MatchedKind::Ident { role: "col_name", .. } => {
+            MatchedKind::Ident {
+                role: "col_name", ..
+            } => {
                 pending_name = Some(item.text.clone());
             }
             // Single-word type — resolve through the SQL alias map.
-            MatchedKind::Ident { role: "col_type", .. } => {
+            MatchedKind::Ident {
+                role: "col_type", ..
+            } => {
                 let ty = Type::from_sql_name(&item.text).ok_or_else(|| ValidationError {
                     message_key: "parse.error_wrapper",
                     args: vec![("detail", "unknown type".to_string())],
@@ -1512,7 +1539,9 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
                 column_open = true;
             }
             // A table-level `PRIMARY KEY (col, …)` column reference.
-            MatchedKind::Ident { role: "pk_column", .. } => {
+            MatchedKind::Ident {
+                role: "pk_column", ..
+            } => {
                 primary_key.push(item.text.clone());
             }
             // `not null` column constraint (only once a column exists;
@@ -1536,7 +1565,10 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
                     let mut cols: Vec<String> = Vec::new();
                     while let Some(it) = items.peek() {
                         match &it.kind {
-                            MatchedKind::Ident { role: "unique_column", .. } => {
+                            MatchedKind::Ident {
+                                role: "unique_column",
+                                ..
+                            } => {
                                 cols.push(it.text.clone());
                                 items.next();
                             }
@@ -1554,7 +1586,10 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
                     // column's flag (round-trips via the single-column
                     // path); composite (or a name not among the
                     // columns) becomes a constraint.
-                    match columns.iter_mut().find(|c| cols.len() == 1 && c.name == cols[0]) {
+                    match columns
+                        .iter_mut()
+                        .find(|c| cols.len() == 1 && c.name == cols[0])
+                    {
                         Some(c) => c.unique = true,
                         None if !cols.is_empty() => unique_constraints.push(cols),
                         None => {}
@@ -1567,16 +1602,17 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
             // the most recent column) or the table-level clause (whose
             // `pk_column` idents follow and are collected above).
             MatchedKind::Word("primary") => {
-                if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("key"))) {
+                if matches!(
+                    items.peek().map(|i| &i.kind),
+                    Some(MatchedKind::Word("key"))
+                ) {
                     items.next();
                     // Table-level `PRIMARY KEY (…)` is followed by `(`
                     // (then `pk_column` idents, collected above);
                     // column-level `PRIMARY KEY` is not, and marks the
                     // most-recent column.
-                    let table_level = matches!(
-                        items.peek().map(|i| &i.kind),
-                        Some(MatchedKind::Punct('('))
-                    );
+                    let table_level =
+                        matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct('(')));
                     if !table_level && let Some(last) = columns.last() {
                         primary_key.push(last.name.clone());
                     }
@@ -1626,12 +1662,20 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
                 // Inline FK is single-column (the column it sits on);
                 // a compound FK uses the table-level form (ADR-0043 D4).
                 let child_column = columns.last().map_or_else(String::new, |c| c.name.clone());
-                foreign_keys.push(consume_fk_reference(&mut items, None, vec![child_column], true));
+                foreign_keys.push(consume_fk_reference(
+                    &mut items,
+                    None,
+                    vec![child_column],
+                    true,
+                ));
             }
             // Table-level `[constraint <name>] foreign key (<col>)
             // references <parent> [(<col>)] [on …]` (ADR-0035 §5, 4b).
             MatchedKind::Word("foreign") => {
-                if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("key"))) {
+                if matches!(
+                    items.peek().map(|i| &i.kind),
+                    Some(MatchedKind::Word("key"))
+                ) {
                     items.next(); // `key`
                 }
                 // `( <child column> [, <child column>]* )` — a compound
@@ -1653,7 +1697,10 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
                     items.next();
                 }
                 // `references <parent> …`
-                if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("references"))) {
+                if matches!(
+                    items.peek().map(|i| &i.kind),
+                    Some(MatchedKind::Word("references"))
+                ) {
                     items.next();
                 }
                 let fk =
@@ -1838,13 +1885,19 @@ where
         Some(MatchedKind::Word("cascade")) => ReferentialAction::Cascade,
         Some(MatchedKind::Word("restrict")) => ReferentialAction::Restrict,
         Some(MatchedKind::Word("set")) => {
-            if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("null"))) {
+            if matches!(
+                items.peek().map(|i| &i.kind),
+                Some(MatchedKind::Word("null"))
+            ) {
                 items.next();
             }
             ReferentialAction::SetNull
         }
         Some(MatchedKind::Word("no")) => {
-            if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("action"))) {
+            if matches!(
+                items.peek().map(|i| &i.kind),
+                Some(MatchedKind::Word("action"))
+            ) {
                 items.next();
             }
             ReferentialAction::NoAction
@@ -1858,6 +1911,7 @@ pub static SQL_CREATE_TABLE: CommandNode = CommandNode {
     shape: Node::Subgrammar(&super::sql_create_table::SQL_CREATE_TABLE_SHAPE),
     ast_builder: build_sql_create_table,
     help_id: Some("ddl.sql_create_table"),
+    hint_ids: &["sql_create_table"],
     usage_ids: &["parse.usage.sql_create_table"],
 };
 
@@ -1877,6 +1931,7 @@ pub static SQL_DROP_TABLE: CommandNode = CommandNode {
     shape: SQL_DROP_TABLE_SHAPE,
     ast_builder: build_sql_drop_table,
     help_id: Some("ddl.sql_drop_table"),
+    hint_ids: &["sql_drop_table"],
     usage_ids: &["parse.usage.sql_drop_table"],
 };
 
@@ -1896,6 +1951,7 @@ pub static SQL_DROP_INDEX: CommandNode = CommandNode {
     shape: SQL_DROP_INDEX_SHAPE,
     ast_builder: build_sql_drop_index,
     help_id: Some("ddl.sql_drop_index"),
+    hint_ids: &["sql_drop_index"],
     usage_ids: &["parse.usage.sql_drop_index"],
 };
 
@@ -1909,11 +1965,12 @@ pub static SQL_DROP_INDEX: CommandNode = CommandNode {
 // concrete keyword (`unique index` | `index`) — the trap-safe form (the
 // §3 rule forbids a leading *Optional*, not a leading `Choice`). The
 // builder reads `unique` presence via `contains_word("unique")`.
-static SQL_CI_UNIQUE_INDEX_NODES: &[Node] =
-    &[Node::Word(Word::keyword("unique")), Node::Word(Word::keyword("index"))];
+static SQL_CI_UNIQUE_INDEX_NODES: &[Node] = &[
+    Node::Word(Word::keyword("unique")),
+    Node::Word(Word::keyword("index")),
+];
 const SQL_CI_UNIQUE_INDEX: Node = Node::Seq(SQL_CI_UNIQUE_INDEX_NODES);
-static SQL_CI_LEAD_CHOICES: &[Node] =
-    &[SQL_CI_UNIQUE_INDEX, Node::Word(Word::keyword("index"))];
+static SQL_CI_LEAD_CHOICES: &[Node] = &[SQL_CI_UNIQUE_INDEX, Node::Word(Word::keyword("index"))];
 const SQL_CI_LEAD: Node = Node::Choice(SQL_CI_LEAD_CHOICES);
 
 static SQL_CI_IF_NOT_EXISTS_NODES: &[Node] = &[
@@ -1977,6 +2034,7 @@ pub static SQL_CREATE_INDEX: CommandNode = CommandNode {
     shape: SQL_CREATE_INDEX_SHAPE,
     ast_builder: build_sql_create_index,
     help_id: Some("ddl.sql_create_index"),
+    hint_ids: &["sql_create_index"],
     usage_ids: &["parse.usage.sql_create_index"],
 };
 
@@ -2079,8 +2137,7 @@ static AT_RENAME_COLUMN_TAIL_NODES: &[Node] = &[
     NEW_COLUMN_NAME,
 ];
 const AT_RENAME_COLUMN_TAIL: Node = Node::Seq(AT_RENAME_COLUMN_TAIL_NODES);
-static AT_RENAME_TABLE_TAIL_NODES: &[Node] =
-    &[Node::Word(Word::keyword("to")), NEW_TABLE_NAME];
+static AT_RENAME_TABLE_TAIL_NODES: &[Node] = &[Node::Word(Word::keyword("to")), NEW_TABLE_NAME];
 const AT_RENAME_TABLE_TAIL: Node = Node::Seq(AT_RENAME_TABLE_TAIL_NODES);
 static AT_RENAME_TAIL_CHOICES: &[Node] = &[AT_RENAME_COLUMN_TAIL, AT_RENAME_TABLE_TAIL];
 const AT_RENAME_TAIL: Node = Node::Choice(AT_RENAME_TAIL_CHOICES);
@@ -2107,8 +2164,10 @@ static AT_AC_TYPE_NODES: &[Node] = &[
     super::sql_create_table::SQL_TYPE,
 ];
 const AT_AC_TYPE: Node = Node::Seq(AT_AC_TYPE_NODES);
-static AT_AC_NOT_NULL_NODES: &[Node] =
-    &[Node::Word(Word::keyword("not")), Node::Word(Word::keyword("null"))];
+static AT_AC_NOT_NULL_NODES: &[Node] = &[
+    Node::Word(Word::keyword("not")),
+    Node::Word(Word::keyword("null")),
+];
 const AT_AC_NOT_NULL: Node = Node::Seq(AT_AC_NOT_NULL_NODES);
 static AT_AC_SET_DATA_TYPE_NODES: &[Node] = &[
     Node::Word(Word::keyword("data")),
@@ -2124,8 +2183,7 @@ static AT_AC_SET_TAIL_CHOICES: &[Node] = &[
 const AT_AC_SET_TAIL: Node = Node::Choice(AT_AC_SET_TAIL_CHOICES);
 static AT_AC_SET_NODES: &[Node] = &[Node::Word(Word::keyword("set")), AT_AC_SET_TAIL];
 const AT_AC_SET: Node = Node::Seq(AT_AC_SET_NODES);
-static AT_AC_DROP_TAIL_CHOICES: &[Node] =
-    &[AT_AC_NOT_NULL, Node::Word(Word::keyword("default"))];
+static AT_AC_DROP_TAIL_CHOICES: &[Node] = &[AT_AC_NOT_NULL, Node::Word(Word::keyword("default"))];
 const AT_AC_DROP_TAIL: Node = Node::Choice(AT_AC_DROP_TAIL_CHOICES);
 static AT_AC_DROP_NODES: &[Node] = &[Node::Word(Word::keyword("drop")), AT_AC_DROP_TAIL];
 const AT_AC_DROP: Node = Node::Seq(AT_AC_DROP_NODES);
@@ -2233,10 +2291,14 @@ fn build_alter_add_column_spec(
     let mut items = path.items.iter().peekable();
     while let Some(item) = items.next() {
         match &item.kind {
-            MatchedKind::Ident { role: "col_name", .. } => {
+            MatchedKind::Ident {
+                role: "col_name", ..
+            } => {
                 pending_name = Some(item.text.clone());
             }
-            MatchedKind::Ident { role: "col_type", .. } => {
+            MatchedKind::Ident {
+                role: "col_type", ..
+            } => {
                 let ty = Type::from_sql_name(&item.text).ok_or_else(|| ValidationError {
                     message_key: "parse.error_wrapper",
                     args: vec![("detail", "unknown type".to_string())],
@@ -2255,7 +2317,10 @@ fn build_alter_add_column_spec(
                 spec = Some(ColumnSpec::new(name, Type::Real));
             }
             MatchedKind::Word("not") => {
-                if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("null"))) {
+                if matches!(
+                    items.peek().map(|i| &i.kind),
+                    Some(MatchedKind::Word("null"))
+                ) {
                     items.next();
                     if let Some(s) = spec.as_mut() {
                         s.not_null = true;
@@ -2301,11 +2366,15 @@ fn build_alter_column_type(path: &MatchedPath) -> Result<AlterTableAction, Valid
     let mut items = path.items.iter().peekable();
     while let Some(item) = items.next() {
         match &item.kind {
-            MatchedKind::Ident { role: "col_type", .. } => {
-                ty = Some(Type::from_sql_name(&item.text).ok_or_else(|| ValidationError {
-                    message_key: "parse.error_wrapper",
-                    args: vec![("detail", "unknown type".to_string())],
-                })?);
+            MatchedKind::Ident {
+                role: "col_type", ..
+            } => {
+                ty = Some(
+                    Type::from_sql_name(&item.text).ok_or_else(|| ValidationError {
+                        message_key: "parse.error_wrapper",
+                        args: vec![("detail", "unknown type".to_string())],
+                    })?,
+                );
             }
             MatchedKind::Word("double") => {
                 if matches!(
@@ -2354,7 +2423,10 @@ fn build_alter_column_attr(
                 message_key: "parse.error_wrapper",
                 args: vec![("detail", "set default needs a value".to_string())],
             })?;
-            AlterTableAction::SetColumnDefault { column, default_sql }
+            AlterTableAction::SetColumnDefault {
+                column,
+                default_sql,
+            }
         }
         (false, true) => AlterTableAction::DropColumnDefault { column },
         (true, false) => AlterTableAction::SetColumnNotNull { column },
@@ -2470,10 +2542,7 @@ fn build_alter_add_table_constraint(
 /// Capture the raw SQL text of an `ADD … CHECK (<expr>)` (ADR-0035 §4g).
 /// `sql_expr` is validate-only, so the expression is captured by byte
 /// span — the 4a.2 / 4e mechanism.
-fn capture_table_check_sql(
-    path: &MatchedPath,
-    source: &str,
-) -> Result<String, ValidationError> {
+fn capture_table_check_sql(path: &MatchedPath, source: &str) -> Result<String, ValidationError> {
     let mut items = path.items.iter().peekable();
     while let Some(item) = items.next() {
         if matches!(item.kind, MatchedKind::Word("check"))
@@ -2503,7 +2572,10 @@ fn build_alter_fk(path: &MatchedPath) -> SqlForeignKey {
         items.next();
     }
     items.next(); // `foreign`
-    if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("key"))) {
+    if matches!(
+        items.peek().map(|i| &i.kind),
+        Some(MatchedKind::Word("key"))
+    ) {
         items.next();
     }
     if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct('('))) {
@@ -2523,7 +2595,10 @@ fn build_alter_fk(path: &MatchedPath) -> SqlForeignKey {
     if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct(')'))) {
         items.next();
     }
-    if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("references"))) {
+    if matches!(
+        items.peek().map(|i| &i.kind),
+        Some(MatchedKind::Word("references"))
+    ) {
         items.next();
     }
     // `ALTER TABLE … ADD FOREIGN KEY (…)` is the table-level form.
@@ -2535,6 +2610,7 @@ pub static SQL_ALTER_TABLE: CommandNode = CommandNode {
     shape: SQL_ALTER_TABLE_SHAPE,
     ast_builder: build_sql_alter_table,
     help_id: Some("ddl.sql_alter_table"),
+    hint_ids: &["sql_alter_table"],
     usage_ids: &["parse.usage.sql_alter_table"],
 };
 
@@ -2600,7 +2676,10 @@ mod constraint_tests {
     fn an_unconstrained_create_table_still_parses() {
         let cols = create_columns("create table T with pk id(serial), name(text)");
         assert_eq!(cols.len(), 2);
-        assert!(cols.iter().all(|c| !c.not_null && !c.unique && c.default.is_none()));
+        assert!(
+            cols.iter()
+                .all(|c| !c.not_null && !c.unique && c.default.is_none())
+        );
     }
 
     #[test]
@@ -2625,7 +2704,9 @@ mod constraint_tests {
     #[test]
     fn add_column_parses_a_unique_constraint() {
         match parse_command("add column to T: email (text) unique").expect("parse") {
-            Command::AddColumn { unique, not_null, .. } => {
+            Command::AddColumn {
+                unique, not_null, ..
+            } => {
                 assert!(unique);
                 assert!(!not_null);
             }
@@ -2656,9 +2737,7 @@ mod constraint_tests {
     fn check_with_a_parenthesised_sub_expression_parses() {
         // The check's own parens plus a nested group — the
         // builder's paren-depth scan must pair them correctly.
-        let cols = create_columns(
-            "create table T with pk n(int) check ((n > 0) or (n < -10))",
-        );
+        let cols = create_columns("create table T with pk n(int) check ((n > 0) or (n < -10))");
         assert!(cols[0].check.is_some());
     }
 
@@ -2705,8 +2784,7 @@ mod constraint_tests {
 
     #[test]
     fn add_constraint_check_parses() {
-        match parse_command("add constraint check (age >= 0) to Users.age").expect("parse")
-        {
+        match parse_command("add constraint check (age >= 0) to Users.age").expect("parse") {
             Command::AddConstraint {
                 column, constraint, ..
             } => {
@@ -2800,8 +2878,11 @@ mod sql_drop_table_tests {
             Command::DropColumn { .. }
         ));
         assert!(matches!(
-            parse_command_in_mode("drop relationship Customers_id_to_Orders_CustId", Mode::Advanced)
-                .expect("parses"),
+            parse_command_in_mode(
+                "drop relationship Customers_id_to_Orders_CustId",
+                Mode::Advanced
+            )
+            .expect("parses"),
             Command::DropRelationship { .. }
         ));
     }
@@ -2906,7 +2987,13 @@ mod sql_create_index_tests {
                 columns,
                 unique,
                 if_not_exists,
-            } => Ci { name, table, columns, unique, if_not_exists },
+            } => Ci {
+                name,
+                table,
+                columns,
+                unique,
+                if_not_exists,
+            },
             other => panic!("expected SqlCreateIndex, got {other:?}"),
         }
     }
@@ -3108,7 +3195,9 @@ mod sql_alter_table_tests {
         // The target slot carries the `reject_internal_table` validator
         // (mirroring CREATE TABLE), so an `__rdbms_*` target is refused
         // before submit — engine-neutral, not a raw engine error.
-        assert!(parse_command_in_mode("alter table T rename to __rdbms_evil", Mode::Advanced).is_err());
+        assert!(
+            parse_command_in_mode("alter table T rename to __rdbms_evil", Mode::Advanced).is_err()
+        );
     }
 
     #[test]
@@ -3187,7 +3276,10 @@ mod sql_alter_table_tests {
         // alias map still applies through the synonym
         assert!(matches!(
             alter("alter table T alter column n set data type double precision").1,
-            AlterTableAction::AlterColumnType { ty: crate::dsl::types::Type::Real, .. }
+            AlterTableAction::AlterColumnType {
+                ty: crate::dsl::types::Type::Real,
+                ..
+            }
         ));
     }
 
@@ -3212,7 +3304,10 @@ mod sql_alter_table_tests {
     #[test]
     fn alter_column_set_default_captures_raw_expr() {
         match alter("alter table T alter column qty set default 0").1 {
-            AlterTableAction::SetColumnDefault { column, default_sql } => {
+            AlterTableAction::SetColumnDefault {
+                column,
+                default_sql,
+            } => {
                 assert_eq!(column, "qty");
                 assert_eq!(default_sql, "0");
             }
@@ -3291,7 +3386,9 @@ mod sql_alter_table_tests {
         match alter("alter table T add check (a < b)").1 {
             AlterTableAction::AddTableConstraint { name, constraint } => {
                 assert_eq!(name, None);
-                assert!(matches!(*constraint, TableConstraint::Check { ref expr_sql } if expr_sql == "a < b"));
+                assert!(
+                    matches!(*constraint, TableConstraint::Check { ref expr_sql } if expr_sql == "a < b")
+                );
             }
             other => panic!("expected AddTableConstraint/Check, got {other:?}"),
         }
@@ -3309,7 +3406,9 @@ mod sql_alter_table_tests {
         match alter("alter table T add unique (a, b)").1 {
             AlterTableAction::AddTableConstraint { name, constraint } => {
                 assert_eq!(name, None);
-                assert!(matches!(*constraint, TableConstraint::Unique { ref columns } if columns == &["a".to_string(), "b".to_string()]));
+                assert!(
+                    matches!(*constraint, TableConstraint::Unique { ref columns } if columns == &["a".to_string(), "b".to_string()])
+                );
             }
             other => panic!("expected AddTableConstraint/Unique, got {other:?}"),
         }
@@ -3326,7 +3425,9 @@ mod sql_alter_table_tests {
         )
         .expect_err("a named UNIQUE constraint is refused");
         assert!(
-            err.to_string().to_lowercase().contains("unique constraint cannot be named"),
+            err.to_string()
+                .to_lowercase()
+                .contains("unique constraint cannot be named"),
             "expected the builder's named-UNIQUE refusal, got: {err}"
         );
     }
@@ -3338,7 +3439,9 @@ mod sql_alter_table_tests {
         let err = parse_command_in_mode("alter table T add primary key (id)", Mode::Advanced)
             .expect_err("ADD PRIMARY KEY is refused");
         assert!(
-            err.to_string().to_lowercase().contains("primary key is fixed at creation"),
+            err.to_string()
+                .to_lowercase()
+                .contains("primary key is fixed at creation"),
             "expected the builder's ADD-PRIMARY-KEY refusal, got: {err}"
         );
     }
@@ -3366,7 +3469,10 @@ mod sql_alter_table_tests {
                 assert_eq!(name.as_deref(), Some("fk_p"));
                 match *constraint {
                     TableConstraint::ForeignKey(fk) => {
-                        assert_eq!(fk.parent_columns, None, "bare reference resolves at execution");
+                        assert_eq!(
+                            fk.parent_columns, None,
+                            "bare reference resolves at execution"
+                        );
                     }
                     other => panic!("expected ForeignKey, got {other:?}"),
                 }

src/dsl/grammar/expr.rs

@@ -79,9 +79,9 @@ const EXPR_COLUMN: Node = Node::Ident {
     writes_table: false,
     writes_column: true,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 /// Operand alternatives. The literal keywords (`null` / `true`
@@ -126,8 +126,7 @@ fn where_rhs_operand(ctx: &WalkContext) -> Node {
             // the leak is per distinct column (the walker
             // memoizes `DynamicSubgrammar` resolution on
             // `current_column`), not per keystroke.
-            let leaked: &'static str =
-                Box::leak(col.name.clone().into_boxed_str());
+            let leaked: &'static str = Box::leak(col.name.clone().into_boxed_str());
             Node::TypedValueSlot {
                 ty: col.user_type,
                 column_name: Some(leaked),
@@ -260,10 +259,8 @@ static PAREN_GROUP_NODES: &[Node] = &[
     Node::Subgrammar(&OR_EXPR),
     Node::Punct(')'),
 ];
-static BOOL_PRIMARY_CHOICES: &[Node] = &[
-    Node::Seq(PAREN_GROUP_NODES),
-    Node::Subgrammar(&PREDICATE),
-];
+static BOOL_PRIMARY_CHOICES: &[Node] =
+    &[Node::Seq(PAREN_GROUP_NODES), Node::Subgrammar(&PREDICATE)];
 static BOOL_PRIMARY: Node = Node::Choice(BOOL_PRIMARY_CHOICES);
 
 /// `not_expr := NOT not_expr | bool_primary`.
@@ -271,10 +268,7 @@ static NOT_FORM_NODES: &[Node] = &[
     Node::Word(Word::keyword("not")),
     Node::Subgrammar(&NOT_EXPR),
 ];
-static NOT_EXPR_CHOICES: &[Node] = &[
-    Node::Seq(NOT_FORM_NODES),
-    Node::Subgrammar(&BOOL_PRIMARY),
-];
+static NOT_EXPR_CHOICES: &[Node] = &[Node::Seq(NOT_FORM_NODES), Node::Subgrammar(&BOOL_PRIMARY)];
 static NOT_EXPR: Node = Node::Choice(NOT_EXPR_CHOICES);
 
 /// `and_expr := not_expr ( AND not_expr )*`.
@@ -296,10 +290,7 @@ static AND_EXPR: Node = Node::Seq(AND_EXPR_NODES);
 /// `or_expr := and_expr ( OR and_expr )*` — the fragment entry
 /// point. `update` / `delete` / `show data` reference this
 /// through `Node::Subgrammar(&OR_EXPR)`.
-static OR_TAIL_NODES: &[Node] = &[
-    Node::Word(Word::keyword("or")),
-    Node::Subgrammar(&AND_EXPR),
-];
+static OR_TAIL_NODES: &[Node] = &[Node::Word(Word::keyword("or")), Node::Subgrammar(&AND_EXPR)];
 static OR_TAIL: Node = Node::Seq(OR_TAIL_NODES);
 static OR_EXPR_NODES: &[Node] = &[
     Node::Subgrammar(&AND_EXPR),
@@ -534,18 +525,18 @@ impl<'a> ExprParser<'a> {
         let span = item.span;
         let literal = |value: Value| Operand::Literal { value, span };
         match &item.kind {
-            MatchedKind::Ident { role: "expr_column", .. } => {
-                Ok(Operand::Column { name: item.text.clone(), span })
-            }
+            MatchedKind::Ident {
+                role: "expr_column",
+                ..
+            } => Ok(Operand::Column {
+                name: item.text.clone(),
+                span,
+            }),
             MatchedKind::Word("null") => Ok(literal(Value::Null)),
             MatchedKind::Word("true") => Ok(literal(Value::Bool(true))),
             MatchedKind::Word("false") => Ok(literal(Value::Bool(false))),
-            MatchedKind::NumberLit => {
-                Ok(literal(Value::Number(item.text.clone())))
-            }
-            MatchedKind::StringLit => {
-                Ok(literal(Value::Text(item.text.clone())))
-            }
+            MatchedKind::NumberLit => Ok(literal(Value::Number(item.text.clone()))),
+            MatchedKind::StringLit => Ok(literal(Value::Text(item.text.clone()))),
             _ => Err(drift_error("expected a column or literal operand")),
         }
     }
@@ -591,8 +582,7 @@ mod tests {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        let result =
-            walk_node(input, 0, &OR_EXPR, &mut ctx, &mut path, &mut per_byte);
+        let result = walk_node(input, 0, &OR_EXPR, &mut ctx, &mut path, &mut per_byte);
         match result {
             NodeWalkResult::Matched { end, .. } => {
                 assert!(
@@ -730,8 +720,7 @@ mod tests {
                 negated: false,
             }),
         );
-        let Expr::Predicate(Predicate::Like { negated, .. }) =
-            parse_expr("Name not like 'A%'")
+        let Expr::Predicate(Predicate::Like { negated, .. }) = parse_expr("Name not like 'A%'")
         else {
             panic!("expected a negated Like");
         };
@@ -794,16 +783,16 @@ mod tests {
     fn nested_parentheses_round_trip() {
         // Exercises the Subgrammar recursion a few levels deep.
         let expr = parse_expr("((a = 1 and b = 2) or (c = 3))");
-        assert!(matches!(expr, Expr::Or(_) | Expr::And(_) | Expr::Predicate(_)));
+        assert!(matches!(
+            expr,
+            Expr::Or(_) | Expr::And(_) | Expr::Predicate(_)
+        ));
     }
 
     #[test]
     fn case_insensitive_keywords() {
         // Keywords fold case; the built tree is identical.
-        assert_eq!(
-            parse_expr("a = 1 AND b = 2"),
-            parse_expr("a = 1 and b = 2"),
-        );
+        assert_eq!(parse_expr("a = 1 AND b = 2"), parse_expr("a = 1 and b = 2"),);
         assert_eq!(
             parse_expr("Email IS NOT NULL"),
             parse_expr("Email is not null"),

src/dsl/grammar/mod.rs

@@ -27,9 +27,9 @@ pub mod data;
 pub mod ddl;
 pub mod expr;
 pub mod shared;
-pub mod sql_expr;
 pub mod sql_create_table;
 pub mod sql_delete;
+pub mod sql_expr;
 pub mod sql_insert;
 pub mod sql_select;
 pub mod sql_update;
@@ -328,9 +328,7 @@ pub enum Node {
     /// A number literal. The optional `validator` runs against
     /// the matched text (used by Phase D value slots to enforce
     /// per-type integer/decimal rules).
-    NumberLit {
-        validator: Option<NumberValidator>,
-    },
+    NumberLit { validator: Option<NumberValidator> },
     /// A literal byte sequence at this position — matches
     /// bytes verbatim (whitespace-skipped) with a lookahead so
     /// `1` doesn't half-match `12` and `n` doesn't half-match
@@ -530,6 +528,18 @@ pub struct CommandNode {
     /// so a newly-registered command appears in `help`
     /// automatically (ADR-0024 §help_id).
     pub help_id: Option<&'static str>,
+    /// Catalog key stems (`hint.cmd.<id>`) for this command's
+    /// **tier-3** contextual hints (ADR-0053 / H2), **one per form**,
+    /// mirroring `usage_ids`. A single-form command carries one; a
+    /// multi-form command (`add`, `drop`, `show`, `create`) carries
+    /// one per form so a live-input hint can be specific to the form
+    /// being typed (`hint.cmd.add_relationship`, not a shared `add`
+    /// block). `hint_key_for_input_in_mode` disambiguates by the form
+    /// word, reusing `usage_key_for_input_in_mode`'s logic. Empty
+    /// until a form's tier-3 block is authored (the surface falls back
+    /// to tier-2 ambient/error text). Distinct from `help_id` (which is
+    /// `None` on advanced-SQL forms purely to dedup the `help` list).
+    pub hint_ids: &'static [&'static str],
     /// Catalog keys under `parse.usage.*` to render in the
     /// "usage:" block when a parse error fires for this command
     /// (ADR-0021 §1, ADR-0024 §architecture). Multi-form families
@@ -574,32 +584,100 @@ pub fn usage_keys_for_input_in_mode(
     source: &str,
     mode: crate::mode::Mode,
 ) -> Option<(&'static str, Vec<&'static str>)> {
+    let pick = selected_nodes_for_input_in_mode(source, mode);
+    if pick.is_empty() {
+        return None;
+    }
+    let mut keys: Vec<&'static str> = Vec::new();
+    for (_, node, _) in &pick {
+        for k in node.usage_ids {
+            if !keys.contains(k) {
+                keys.push(*k);
+            }
+        }
+    }
+    if keys.is_empty() {
+        return None;
+    }
+    let entry = pick[0].1.entry.primary;
+    Some((entry, keys))
+}
+
+/// The single tier-3 hint key (`hint.cmd.<id>` stem) for the command
+/// **form** `source` is currently typing, in `mode` (H2 / ADR-0053).
+///
+/// Mirrors [`usage_key_for_input_in_mode`]: the union of the
+/// mode-selected nodes' `hint_ids`, disambiguated to the typed form by
+/// [`pick_form_key`] — so `add 1:n relationship` resolves to the
+/// relationship hint, and an advanced-SQL form resolves to its own
+/// (not its simple sibling's). `None` if no entry word matches or the
+/// form has no tier-3 block yet (the caller falls back to tier-2).
+#[must_use]
+pub fn hint_key_for_input_in_mode(source: &str, mode: crate::mode::Mode) -> Option<&'static str> {
+    use crate::dsl::walker::lex_helpers::{consume_ident, skip_whitespace};
+    let nodes = selected_nodes_for_input_in_mode(source, mode);
+    if nodes.is_empty() {
+        return None;
+    }
+    // Mode-ordered union (advanced-primary first in advanced mode), so a
+    // shared entry word resolves to the surface the user is in.
+    let mut keys: Vec<&'static str> = Vec::new();
+    for (_, node, _) in &nodes {
+        for k in node.hint_ids {
+            if !keys.contains(k) {
+                keys.push(*k);
+            }
+        }
+    }
+    if keys.is_empty() {
+        return None;
+    }
+    if keys.len() == 1 {
+        return Some(keys[0]);
+    }
+    // A bare multi-form entry word (no form word yet — `add`⏎) has no
+    // chosen form: defer to tier-2, which lists the choices.
+    let start = skip_whitespace(source, 0);
+    if let Some((_, entry_end)) = consume_ident(source, start)
+        && skip_whitespace(source, entry_end) >= source.len()
+    {
+        return None;
+    }
+    // A form word picks the form (`drop column` → `drop_column`); when
+    // the second token isn't a form word (`insert into …`, `update …
+    // set`), fall back to the mode-primary key — in advanced mode the
+    // SQL form, in simple mode the DSL form.
+    pick_form_key(source, &keys).or_else(|| keys.first().copied())
+}
+
+/// Shared mode-aware command-form selection for the entry word at the
+/// start of `source`.
+///
+/// Extracted so the usage-key and hint-id lookups agree on which form
+/// the user is typing.
+///
+/// Advanced mode: every candidate form is reachable — the SQL nodes
+/// are primary, and the DSL nodes remain valid via fallback (verified:
+/// `create table … with pk` and `drop column …` both run in advanced
+/// mode). Mode-primary (Advanced) first, so a hint never hides input
+/// that works. Simple mode: only the DSL forms — the SQL-only forms
+/// hit the "this is SQL" rail and are not reachable. (ADR-0042 G3.)
+/// Degenerate guard: an advanced-only word in simple mode leaves the
+/// selection empty; fall back to all candidates.
+fn selected_nodes_for_input_in_mode(
+    source: &str,
+    mode: crate::mode::Mode,
+) -> Vec<(usize, &'static CommandNode, CommandCategory)> {
     use crate::dsl::walker::lex_helpers::{consume_ident, skip_whitespace};
     let start = skip_whitespace(source, 0);
-    let (kw_start, kw_end) = consume_ident(source, start)?;
+    let Some((kw_start, kw_end)) = consume_ident(source, start) else {
+        return Vec::new();
+    };
     let word = &source[kw_start..kw_end];
     let candidates = commands_for_entry_word(word);
     if candidates.is_empty() {
-        return None;
+        return Vec::new();
     }
-    let union = |nodes: &[(usize, &'static CommandNode, CommandCategory)]| -> Vec<&'static str> {
-        let mut keys: Vec<&'static str> = Vec::new();
-        for (_, node, _) in nodes {
-            for k in node.usage_ids {
-                if !keys.contains(k) {
-                    keys.push(*k);
-                }
-            }
-        }
-        keys
-    };
-    // Advanced mode: every candidate form is reachable — the SQL
-    // nodes are primary, and the DSL nodes remain valid via fallback
-    // (verified: `create table … with pk` and `drop column …` both
-    // run in advanced mode). Show them all, mode-primary (Advanced)
-    // first, so the usage hint never hides input that works. Simple
-    // mode: only the DSL forms — the SQL-only forms hit the "this is
-    // SQL" rail and are not reachable. (ADR-0042 G3.)
     let selected: Vec<(usize, &'static CommandNode, CommandCategory)> =
         if mode == crate::mode::Mode::Advanced {
             let mut v: Vec<_> = candidates
@@ -621,17 +699,11 @@ pub fn usage_keys_for_input_in_mode(
                 .filter(|(_, _, c)| *c == CommandCategory::Simple)
                 .collect()
         };
-    // Degenerate guard: an advanced-only word in simple mode (not
-    // normally reachable — it hits the SQL rail first) leaves
-    // `selected` empty; fall back to all candidates so a usage block
-    // still renders rather than the available-commands fallback.
-    let pick = if selected.is_empty() { candidates } else { selected };
-    let keys = union(&pick);
-    if keys.is_empty() {
-        return None;
+    if selected.is_empty() {
+        candidates
+    } else {
+        selected
     }
-    let entry = pick[0].1.entry.primary;
-    Some((entry, keys))
 }
 
 /// The single usage template most relevant to `source`, when
@@ -654,18 +726,25 @@ pub fn usage_key_for_input(source: &str) -> Option<&'static str> {
 /// disambiguates the single most-relevant usage key from the
 /// mode-selected key set.
 #[must_use]
-pub fn usage_key_for_input_in_mode(
-    source: &str,
-    mode: crate::mode::Mode,
-) -> Option<&'static str> {
-    use crate::dsl::walker::lex_helpers::{consume_ident, skip_whitespace};
+pub fn usage_key_for_input_in_mode(source: &str, mode: crate::mode::Mode) -> Option<&'static str> {
     let (_entry, keys) = usage_keys_for_input_in_mode(source, mode)?;
+    pick_form_key(source, &keys)
+}
+
+/// From the form word after the entry keyword, pick the single `keys`
+/// entry for the form `source` names.
+///
+/// A single-entry list resolves to its one key; a multi-form list
+/// disambiguates by the form word (`add 1:n relationship` → the
+/// `…relationship` key, `create m:n …` → the `…m2n` key, else the
+/// identifier form word matched against each key's suffix). Shared by
+/// the usage-template and tier-3-hint single-key lookups so they agree.
+fn pick_form_key<'a>(source: &str, keys: &[&'a str]) -> Option<&'a str> {
+    use crate::dsl::walker::lex_helpers::{consume_ident, skip_whitespace};
     let first = *keys.first()?;
     if keys.len() == 1 {
         return Some(first);
     }
-    // Multi-form: the form is named by the token right after
-    // the entry keyword.
     let start = skip_whitespace(source, 0);
     let (_, entry_end) = consume_ident(source, start)?;
     let after = skip_whitespace(source, entry_end);
@@ -674,14 +753,15 @@ pub fn usage_key_for_input_in_mode(
         return keys.iter().copied().find(|k| k.ends_with("relationship"));
     }
     // The `create m:n relationship` form (ADR-0045) opens with `m:n`
-    // — a letter, so the digit branch misses it, and its usage key ends
-    // `…create_m2n` (not `relationship`).
-    if source[after..].get(..3).is_some_and(|s| s.eq_ignore_ascii_case("m:n")) {
+    // — a letter, so the digit branch misses it; its key ends `…m2n`.
+    if source[after..]
+        .get(..3)
+        .is_some_and(|s| s.eq_ignore_ascii_case("m:n"))
+    {
         return keys.iter().copied().find(|k| k.ends_with("m2n"));
     }
-    // Otherwise the form word is an identifier — `column`,
-    // `index`, `table`, `relationship` — matched against the
-    // usage key's suffix.
+    // Otherwise the form word is an identifier — `column`, `index`,
+    // `table`, `relationship` — matched against each key's suffix.
     let (s, e) = consume_ident(source, after)?;
     let form = source[s..e].to_ascii_lowercase();
     keys.iter().copied().find(|k| k.ends_with(form.as_str()))
@@ -692,8 +772,7 @@ pub fn usage_key_for_input_in_mode(
 /// which read the same data through the legacy `usage::REGISTRY`.
 #[must_use]
 pub fn entry_words_alphabetised() -> Vec<&'static str> {
-    let mut words: Vec<&'static str> =
-        REGISTRY.iter().map(|(c, _)| c.entry.primary).collect();
+    let mut words: Vec<&'static str> = REGISTRY.iter().map(|(c, _)| c.entry.primary).collect();
     words.sort_unstable();
     words.dedup();
     words
@@ -712,6 +791,8 @@ pub fn entry_words_alphabetised() -> Vec<&'static str> {
 pub static REGISTRY: &[(&CommandNode, CommandCategory)] = &[
     (&app::QUIT, CommandCategory::Simple),
     (&app::HELP, CommandCategory::Simple),
+    (&app::HINT, CommandCategory::Simple),
+    (&app::VERSION, CommandCategory::Simple),
     (&app::REBUILD, CommandCategory::Simple),
     (&app::SAVE, CommandCategory::Simple),
     (&app::NEW, CommandCategory::Simple),
@@ -825,9 +906,7 @@ pub fn command_for_entry_word(word: &str) -> Option<(usize, &'static CommandNode
 /// returns its `Simple` DSL node and `Advanced` SQL node. The
 /// dispatcher picks among them by the active input mode.
 #[must_use]
-pub fn commands_for_entry_word(
-    word: &str,
-) -> Vec<(usize, &'static CommandNode, CommandCategory)> {
+pub fn commands_for_entry_word(word: &str) -> Vec<(usize, &'static CommandNode, CommandCategory)> {
     REGISTRY
         .iter()
         .enumerate()
@@ -836,6 +915,177 @@ pub fn commands_for_entry_word(
         .collect()
 }
 
+#[cfg(test)]
+mod hint_key_tests {
+    use super::hint_key_for_input_in_mode;
+    use crate::mode::Mode;
+
+    /// Per-form hint keying (ADR-0053 D3): a multi-form command
+    /// resolves the *typed* form, not the node — `add 1:n
+    /// relationship` → the relationship hint, `add column` → the
+    /// (as-yet-unauthored) column hint, never the wrong form.
+    #[test]
+    fn hint_key_resolves_the_typed_form() {
+        assert_eq!(
+            hint_key_for_input_in_mode("add 1:n relationship from A.x to B.y", Mode::Simple),
+            Some("add_relationship")
+        );
+        assert_eq!(
+            hint_key_for_input_in_mode("add column Note text to T", Mode::Simple),
+            Some("add_column")
+        );
+        assert_eq!(
+            hint_key_for_input_in_mode("insert into T values (1)", Mode::Simple),
+            Some("insert")
+        );
+        // Multi-form DROP disambiguates to the typed form too.
+        assert_eq!(
+            hint_key_for_input_in_mode("drop table T", Mode::Simple),
+            Some("drop_table")
+        );
+        // Mode picks the surface for a shared entry word whose second
+        // token isn't a form word: SQL form in advanced, DSL in simple.
+        assert_eq!(
+            hint_key_for_input_in_mode("insert into T values (1)", Mode::Advanced),
+            Some("sql_insert")
+        );
+        assert_eq!(
+            hint_key_for_input_in_mode("insert into T values (1)", Mode::Simple),
+            Some("insert")
+        );
+        // `create table` shares a form word — advanced-first ordering
+        // resolves it to the SQL form in advanced mode.
+        assert_eq!(
+            hint_key_for_input_in_mode("create table T (id int)", Mode::Advanced),
+            Some("sql_create_table")
+        );
+        // Unknown entry word → None (tier-2 fallback).
+        assert_eq!(hint_key_for_input_in_mode("zzz", Mode::Simple), None);
+    }
+
+    /// Comprehensiveness gate (ADR-0053 D6): every command form in the
+    /// REGISTRY carries at least one `hint_id`, and each resolves to a
+    /// tier-3 `hint.cmd.<id>` block. `keys.rs` checks referenced keys
+    /// resolve; this checks every command *has* one.
+    #[test]
+    fn every_command_form_has_a_tier3_block() {
+        let cat = crate::friendly::catalog();
+        for (node, _category) in super::REGISTRY {
+            assert!(
+                !node.hint_ids.is_empty(),
+                "command `{}` has no hint_ids (ADR-0053 D6)",
+                node.entry.primary
+            );
+            for id in node.hint_ids {
+                let key = format!("hint.cmd.{id}.what");
+                assert!(
+                    cat.get(&key).is_some(),
+                    "missing tier-3 block `{key}` for command `{}`",
+                    node.entry.primary
+                );
+            }
+        }
+    }
+
+    /// Comprehensiveness gate (ADR-0053 D6): every runtime error class
+    /// `friendly::error_hint_class` can return resolves to a tier-3
+    /// `hint.err.<class>` block. Keep this list in sync with
+    /// `error_hint_class` (its own unit tests pin the outputs).
+    /// Diagnostic classes are deferred (issue #38), so not checked here.
+    #[test]
+    fn every_runtime_error_class_has_a_tier3_block() {
+        let cat = crate::friendly::catalog();
+        let classes = [
+            "unique",
+            "foreign_key.child_side",
+            "foreign_key.parent_side",
+            "not_null",
+            "check",
+            "type_mismatch",
+            "not_found",
+            "already_exists",
+            "generic",
+            "invalid_value",
+        ];
+        for c in classes {
+            let key = format!("hint.err.{c}.what");
+            assert!(
+                cat.get(&key).is_some(),
+                "missing tier-3 error block `{key}`"
+            );
+        }
+    }
+
+    /// Semantic-verification guard (handoff-71): every `hint.cmd.<form>`
+    /// **example** must parse in the mode the form is taught for. This
+    /// backstops the bug class found in the H2 corpus pass — an example
+    /// that drifts out of the real grammar (a typo, a removed clause, or
+    /// an argument the command never accepted, e.g. an inline name on
+    /// `save as` which opens a modal instead). It cannot police the
+    /// *semantics* of an example that happens to parse (that is the
+    /// manual pass), but it locks the syntactic floor so future edits
+    /// can't ship an unparseable teaching line.
+    ///
+    /// The mode per form mirrors `hint_key_for_input_in_mode`: the
+    /// advanced-SQL forms are taught in advanced mode; everything else
+    /// (DSL + app commands) in simple mode.
+    #[test]
+    fn every_cmd_hint_example_parses_in_its_mode() {
+        use crate::dsl::parser::parse_command_in_mode;
+        use crate::mode::Mode;
+
+        // Advanced-mode forms — the SQL surface (ADR-0030–0039). Every
+        // other form (DSL + app commands) is taught in simple mode. This
+        // mirrors the mode split `hint_key_for_input_in_mode` resolves.
+        const ADVANCED: &[&str] = &[
+            "sql_create_table",
+            "sql_alter_table",
+            "sql_create_index",
+            "sql_drop_index",
+            "sql_drop_table",
+            "sql_insert",
+            "sql_update",
+            "sql_delete",
+            "select",
+            "with",
+            "explain_sql",
+        ];
+
+        // Iterate the *catalog* (the corpus is the source of truth), not the
+        // REGISTRY: this reaches every `hint.cmd.<id>` block including any
+        // not owned by a command node, so an orphaned or mis-keyed example
+        // can't slip past the guard.
+        let cat = crate::friendly::catalog();
+        let mut checked = 0usize;
+        for key in cat.keys() {
+            let Some(id) = key
+                .strip_prefix("hint.cmd.")
+                .and_then(|rest| rest.strip_suffix(".example"))
+            else {
+                continue;
+            };
+            let example = cat.get(key).expect("key came from the catalog");
+            let mode = if ADVANCED.contains(&id) {
+                Mode::Advanced
+            } else {
+                Mode::Simple
+            };
+            assert!(
+                parse_command_in_mode(example, mode).is_ok(),
+                "hint.cmd.{id}.example does not parse in {mode:?} mode: {example:?}",
+            );
+            checked += 1;
+        }
+        // Floor guard: the corpus had 49 command forms at the time of
+        // writing (ADR-0053). If this drops, a block (and its example
+        // coverage) silently vanished.
+        assert!(
+            checked >= 49,
+            "expected at least 49 hint.cmd.* examples, checked {checked}",
+        );
+    }
+}
+
 #[cfg(test)]
 mod usage_key_tests {
     use super::usage_key_for_input;
@@ -850,10 +1100,7 @@ mod usage_key_tests {
         let cases = [
             ("add column to T: c (int)", "parse.usage.add_column"),
             ("add index on T (c)", "parse.usage.add_index"),
-            (
-                "add constraint unique to T.c",
-                "parse.usage.add_constraint",
-            ),
+            ("add constraint unique to T.c", "parse.usage.add_constraint"),
             (
                 "drop constraint check from T.c",
                 "parse.usage.drop_constraint",
@@ -870,10 +1117,7 @@ mod usage_key_tests {
             ("drop table T", "parse.usage.drop_table"),
             ("drop column from table T: c", "parse.usage.drop_column"),
             ("drop index i", "parse.usage.drop_index"),
-            (
-                "drop relationship r",
-                "parse.usage.drop_relationship",
-            ),
+            ("drop relationship r", "parse.usage.drop_relationship"),
             ("show data T", "parse.usage.show_data"),
             ("show table T", "parse.usage.show_table"),
             // `create` is multi-form (table vs m:n, ADR-0045): each typed

src/dsl/grammar/shared.rs

@@ -7,8 +7,8 @@
 
 use crate::completion::TableColumn;
 use crate::dsl::grammar::{
-    HighlightClass, HintMode, IdentSource, IdentValidator, Node,
-    NumberValidator, ValidationError, Word,
+    HighlightClass, HintMode, IdentSource, IdentValidator, Node, NumberValidator, ValidationError,
+    Word,
 };
 use crate::dsl::types::Type;
 use crate::dsl::walker::context::WalkContext;
@@ -32,10 +32,7 @@ pub fn validate_type_name(value: &str) -> Result<(), ValidationError> {
             .join(", ");
         Err(ValidationError {
             message_key: "parse.custom.unknown_type",
-            args: vec![
-                ("found", value.to_string()),
-                ("expected", expected),
-            ],
+            args: vec![("found", value.to_string()), ("expected", expected)],
         })
     }
 }
@@ -51,12 +48,12 @@ pub const TYPE_SLOT: Node = Node::Ident {
     role: "type",
     validator: Some(TYPE_VALIDATOR),
     highlight_override: Some(HighlightClass::Type),
-        writes_table: false,
-        writes_column: false,
-        writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table: false,
+    writes_column: false,
+    writes_user_listed_column: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 // --- Qualified column reference (`<Table>.<Column>`) --------------
@@ -70,9 +67,9 @@ const QUALIFIED_COLUMN_NODES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
     Node::Punct('.'),
     Node::Ident {
@@ -83,9 +80,9 @@ const QUALIFIED_COLUMN_NODES: &[Node] = &[
         writes_table: false,
         writes_column: false,
         writes_user_listed_column: false,
-    writes_table_alias: false,
-    writes_cte_name: false,
-    writes_projection_alias: false,
+        writes_table_alias: false,
+        writes_cte_name: false,
+        writes_projection_alias: false,
     },
 ];
 pub const QUALIFIED_COLUMN: Node = Node::Seq(QUALIFIED_COLUMN_NODES);
@@ -313,9 +310,7 @@ const fn slot_inner_for_type(ty: Type) -> &'static Node {
         Type::Real => &REAL_SLOT_INNER,
         Type::Decimal => &DECIMAL_SLOT_INNER,
         Type::Bool => &BOOL_SLOT_INNER,
-        Type::Text | Type::Date | Type::DateTime | Type::Blob | Type::ShortId => {
-            &TEXT_SLOT_INNER
-        }
+        Type::Text | Type::Date | Type::DateTime | Type::Blob | Type::ShortId => &TEXT_SLOT_INNER,
     }
 }
 
@@ -397,9 +392,7 @@ pub(crate) const FALLBACK_VALUE_LIST: Node = Node::Repeated {
 /// This is the single source of truth shared by [`column_value_list`]
 /// (which builds the typed slots) and the `data.rs` arity gate (which
 /// counts them) so the two never disagree (issue #17).
-pub fn insert_target_columns<'c>(
-    ctx: &'c WalkContext<'_>,
-) -> Option<Vec<&'c TableColumn>> {
+pub fn insert_target_columns<'c>(ctx: &'c WalkContext<'_>) -> Option<Vec<&'c TableColumn>> {
     let table_cols = ctx.current_table_columns.as_ref()?;
     if table_cols.is_empty() {
         return None;

src/dsl/grammar/sql_create_table.rs

@@ -405,8 +405,14 @@ const TABLE_FK_NAMED: Node = Node::Seq(TABLE_FK_NAMED_NODES);
 // / `foreign`) that disambiguates it from a column name. (A column
 // literally named with one of those keywords is therefore unavailable,
 // the same trade real SQL makes with its reserved words.)
-static ELEMENT_CHOICES: &[Node] =
-    &[TABLE_PK, TABLE_UNIQUE, TABLE_CHECK, TABLE_FK_NAMED, TABLE_FK, COLUMN_DEF];
+static ELEMENT_CHOICES: &[Node] = &[
+    TABLE_PK,
+    TABLE_UNIQUE,
+    TABLE_CHECK,
+    TABLE_FK_NAMED,
+    TABLE_FK,
+    COLUMN_DEF,
+];
 const ELEMENT_INNER: Node = Node::Choice(ELEMENT_CHOICES);
 // Issue #4: wrap the element slot in `IntroProse` so a fresh element
 // position (`create table T (` and after every `,`) surfaces a prose
@@ -495,18 +501,31 @@ mod tests {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        match walk_node(input, 0, &SQL_CREATE_TABLE_SHAPE, &mut ctx, &mut path, &mut per_byte) {
+        match walk_node(
+            input,
+            0,
+            &SQL_CREATE_TABLE_SHAPE,
+            &mut ctx,
+            &mut path,
+            &mut per_byte,
+        ) {
             NodeWalkResult::Matched { end, .. } => input[end..].trim().is_empty(),
             _ => false,
         }
     }
 
     fn good(input: &str) {
-        assert!(walks(input), "{input:?} should be a valid CREATE TABLE tail");
+        assert!(
+            walks(input),
+            "{input:?} should be a valid CREATE TABLE tail"
+        );
     }
 
     fn bad(input: &str) {
-        assert!(!walks(input), "{input:?} should NOT walk as a complete CREATE TABLE tail");
+        assert!(
+            !walks(input),
+            "{input:?} should NOT walk as a complete CREATE TABLE tail"
+        );
     }
 
     #[test]
@@ -638,7 +657,9 @@ mod tests {
         good("table t (id int, ref int references other(id))");
         good("table t (id int, ref int references other)"); // bare ref
         good("table t (id int, ref int references other(id) on delete cascade)");
-        good("table t (id int, ref int references other(id) on update set null on delete restrict)");
+        good(
+            "table t (id int, ref int references other(id) on update set null on delete restrict)",
+        );
         good("table t (id int, ref int, foreign key (ref) references other(id))");
         good("table t (id int, ref int, constraint fk_x foreign key (ref) references other(id))");
         good(
@@ -691,7 +712,10 @@ mod builder_tests {
         assert_eq!(name, "t");
         assert_eq!(
             cols,
-            vec![("id".to_string(), Type::Int), ("name".to_string(), Type::Text)]
+            vec![
+                ("id".to_string(), Type::Int),
+                ("name".to_string(), Type::Text)
+            ]
         );
         assert!(pk.is_empty(), "no PK declared");
         assert!(!ine);
@@ -740,7 +764,10 @@ mod builder_tests {
         let (_, cols, _, _) = sct("create table t (a varchar(255), b numeric(10, 2))");
         assert_eq!(
             cols,
-            vec![("a".to_string(), Type::Text), ("b".to_string(), Type::Decimal)]
+            vec![
+                ("a".to_string(), Type::Text),
+                ("b".to_string(), Type::Decimal)
+            ]
         );
     }
 
@@ -780,8 +807,7 @@ mod builder_tests {
     fn redundant_constraints_deduped_off_sole_pk_column() {
         // ADR-0035 §6.5: advanced mode accepts the redundant spelling
         // and silently drops the flags off the sole PK column.
-        match parse_command("create table t (id int primary key not null unique)")
-            .expect("parses")
+        match parse_command("create table t (id int primary key not null unique)").expect("parses")
         {
             Command::SqlCreateTable {
                 columns,
@@ -944,8 +970,7 @@ mod builder_tests {
         // depth 2, not an element boundary, so the following `check`
         // is still column-level. A naive "reset on any comma" would
         // misclassify it as table-level (the §4.2 probe).
-        let (cols, checks) =
-            parse_sct_checks("create table t (n numeric(10, 2) check (n > 0))");
+        let (cols, checks) = parse_sct_checks("create table t (n numeric(10, 2) check (n > 0))");
         assert_eq!(col(&cols, "n").check_sql.as_deref(), Some("n > 0"));
         assert!(checks.is_empty(), "no table-level CHECK was produced");
     }
@@ -977,8 +1002,7 @@ mod builder_tests {
     fn table_check_before_a_later_column_is_table_level() {
         // A CHECK element that appears between columns (not after a
         // column's type) is table-level even though more columns follow.
-        let (cols, checks) =
-            parse_sct_checks("create table t (a int, check (a > 0), b int)");
+        let (cols, checks) = parse_sct_checks("create table t (a int, check (a > 0), b int)");
         assert_eq!(checks, vec!["a > 0".to_string()]);
         assert!(col(&cols, "a").check_sql.is_none() && col(&cols, "b").check_sql.is_none());
     }
@@ -1004,7 +1028,10 @@ mod builder_tests {
         assert_eq!(fk.parent_columns, Some(vec!["id".to_string()]));
         assert_eq!(fk.on_delete, ReferentialAction::NoAction);
         assert_eq!(fk.on_update, ReferentialAction::NoAction);
-        assert!(fk.inline, "a column-level `references` is an inline FK (ADR-0043 D4)");
+        assert!(
+            fk.inline,
+            "a column-level `references` is an inline FK (ADR-0043 D4)"
+        );
     }
 
     #[test]
@@ -1012,14 +1039,19 @@ mod builder_tests {
         // The table-level `FOREIGN KEY (...)` form is not inline, so it can
         // carry a multi-column reference and never triggers the inline
         // "use the table-level form" hint (ADR-0043 D4).
-        let fks = parse_sct_fks("create table t (id int, pid int, foreign key (pid) references parent(id))");
+        let fks = parse_sct_fks(
+            "create table t (id int, pid int, foreign key (pid) references parent(id))",
+        );
         assert!(!fks[0].inline, "table-level FOREIGN KEY is not inline");
     }
 
     #[test]
     fn bare_inline_reference_has_no_parent_column() {
         let fks = parse_sct_fks("create table t (id int, pid int references parent)");
-        assert_eq!(fks[0].parent_columns, None, "bare REFERENCES — resolved at execution");
+        assert_eq!(
+            fks[0].parent_columns, None,
+            "bare REFERENCES — resolved at execution"
+        );
         assert_eq!(fks[0].parent_table, "parent");
         assert_eq!(fks[0].child_columns, vec!["pid".to_string()]);
     }
@@ -1047,8 +1079,9 @@ mod builder_tests {
 
     #[test]
     fn table_level_foreign_key_captured() {
-        let fks =
-            parse_sct_fks("create table t (id int, pid int, foreign key (pid) references parent(id))");
+        let fks = parse_sct_fks(
+            "create table t (id int, pid int, foreign key (pid) references parent(id))",
+        );
         assert_eq!(fks.len(), 1);
         assert_eq!(fks[0].name, None);
         assert_eq!(fks[0].child_columns, vec!["pid".to_string()]);
@@ -1073,8 +1106,20 @@ mod builder_tests {
              foreign key (a) references p(id), foreign key (b) references q(id))",
         );
         assert_eq!(fks.len(), 2);
-        assert_eq!((fks[0].child_columns[0].as_str(), fks[0].parent_table.as_str()), ("a", "p"));
-        assert_eq!((fks[1].child_columns[0].as_str(), fks[1].parent_table.as_str()), ("b", "q"));
+        assert_eq!(
+            (
+                fks[0].child_columns[0].as_str(),
+                fks[0].parent_table.as_str()
+            ),
+            ("a", "p")
+        );
+        assert_eq!(
+            (
+                fks[1].child_columns[0].as_str(),
+                fks[1].parent_table.as_str()
+            ),
+            ("b", "q")
+        );
     }
 
     #[test]
@@ -1108,7 +1153,12 @@ mod builder_tests {
                 assert_eq!(foreign_keys[0].child_columns, vec!["pid".to_string()]);
                 // the column-level CHECK still attaches to `pid`
                 assert_eq!(
-                    columns.iter().find(|c| c.name == "pid").unwrap().check_sql.as_deref(),
+                    columns
+                        .iter()
+                        .find(|c| c.name == "pid")
+                        .unwrap()
+                        .check_sql
+                        .as_deref(),
                     Some("pid > 0")
                 );
                 // the table-level CHECK is captured separately

src/dsl/grammar/sql_delete.rs

@@ -82,7 +82,14 @@ mod tests {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        match walk_node(input, 0, &SQL_DELETE_SHAPE, &mut ctx, &mut path, &mut per_byte) {
+        match walk_node(
+            input,
+            0,
+            &SQL_DELETE_SHAPE,
+            &mut ctx,
+            &mut path,
+            &mut per_byte,
+        ) {
             NodeWalkResult::Matched { end, .. } => input[end..].trim().is_empty(),
             _ => false,
         }
@@ -93,7 +100,10 @@ mod tests {
     }
 
     fn bad(input: &str) {
-        assert!(!walks(input), "{input:?} should NOT walk as a complete DELETE tail");
+        assert!(
+            !walks(input),
+            "{input:?} should NOT walk as a complete DELETE tail"
+        );
     }
 
     #[test]

src/dsl/grammar/sql_expr.rs

@@ -82,19 +82,16 @@ const EXPR_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 // =================================================================
 // or_expr := and_expr ( OR and_expr )*  — the fragment entry point
 // =================================================================
 
-static OR_TAIL_NODES: &[Node] = &[
-    Node::Word(Word::keyword("or")),
-    Node::Subgrammar(&AND_EXPR),
-];
+static OR_TAIL_NODES: &[Node] = &[Node::Word(Word::keyword("or")), Node::Subgrammar(&AND_EXPR)];
 static OR_TAIL: Node = Node::Seq(OR_TAIL_NODES);
 static SQL_OR_EXPR_NODES: &[Node] = &[
     Node::Subgrammar(&AND_EXPR),
@@ -140,10 +137,7 @@ static NOT_FORM_NODES: &[Node] = &[
     Node::Word(Word::keyword("not")),
     Node::Subgrammar(&NOT_EXPR),
 ];
-static NOT_EXPR_CHOICES: &[Node] = &[
-    Node::Seq(NOT_FORM_NODES),
-    Node::Subgrammar(&PREDICATE),
-];
+static NOT_EXPR_CHOICES: &[Node] = &[Node::Seq(NOT_FORM_NODES), Node::Subgrammar(&PREDICATE)];
 static NOT_EXPR: Node = Node::Choice(NOT_EXPR_CHOICES);
 
 // =================================================================
@@ -156,10 +150,7 @@ static NOT_EXPR: Node = Node::Choice(NOT_EXPR_CHOICES);
 // needs. ADR-0026's DSL grammar made the tail mandatory because it
 // forbade a bare column as a boolean; SQL does not.
 
-static PREDICATE_NODES: &[Node] = &[
-    Node::Subgrammar(&ADDITIVE),
-    Node::Optional(&PREDICATE_TAIL),
-];
+static PREDICATE_NODES: &[Node] = &[Node::Subgrammar(&ADDITIVE), Node::Optional(&PREDICATE_TAIL)];
 static PREDICATE: Node = Node::Seq(PREDICATE_NODES);
 
 // ---- cmp_op := <= | <> | >= | != | < | > | = --------------------
@@ -181,10 +172,7 @@ static CMP_OP_CHOICES: &[Node] = &[
 // ---- predicate_tail branches ------------------------------------
 
 /// `cmp_op additive`.
-static COMPARE_FORM_NODES: &[Node] = &[
-    Node::Choice(CMP_OP_CHOICES),
-    Node::Subgrammar(&ADDITIVE),
-];
+static COMPARE_FORM_NODES: &[Node] = &[Node::Choice(CMP_OP_CHOICES), Node::Subgrammar(&ADDITIVE)];
 
 /// `IS [NOT] NULL`.
 static IS_NULL_NODES: &[Node] = &[
@@ -265,11 +253,7 @@ static PREDICATE_TAIL: Node = Node::Choice(PREDICATE_TAIL_CHOICES);
 // additive := multiplicative ( ( + | - | || ) multiplicative )*
 // =================================================================
 
-static ADD_OP_CHOICES: &[Node] = &[
-    Node::Punct('+'),
-    Node::Punct('-'),
-    Node::Literal("||"),
-];
+static ADD_OP_CHOICES: &[Node] = &[Node::Punct('+'), Node::Punct('-'), Node::Literal("||")];
 static ADD_TAIL_NODES: &[Node] = &[
     Node::Choice(ADD_OP_CHOICES),
     Node::Subgrammar(&MULTIPLICATIVE),
@@ -289,15 +273,8 @@ static ADDITIVE: Node = Node::Seq(ADDITIVE_NODES);
 // multiplicative := unary ( ( * | / | % ) unary )*
 // =================================================================
 
-static MUL_OP_CHOICES: &[Node] = &[
-    Node::Punct('*'),
-    Node::Punct('/'),
-    Node::Punct('%'),
-];
-static MUL_TAIL_NODES: &[Node] = &[
-    Node::Choice(MUL_OP_CHOICES),
-    Node::Subgrammar(&UNARY),
-];
+static MUL_OP_CHOICES: &[Node] = &[Node::Punct('*'), Node::Punct('/'), Node::Punct('%')];
+static MUL_TAIL_NODES: &[Node] = &[Node::Choice(MUL_OP_CHOICES), Node::Subgrammar(&UNARY)];
 static MUL_TAIL: Node = Node::Seq(MUL_TAIL_NODES);
 static MULTIPLICATIVE_NODES: &[Node] = &[
     Node::Subgrammar(&UNARY),
@@ -314,14 +291,8 @@ static MULTIPLICATIVE: Node = Node::Seq(MULTIPLICATIVE_NODES);
 // =================================================================
 
 static SIGN_CHOICES: &[Node] = &[Node::Punct('-'), Node::Punct('+')];
-static UNARY_SIGN_NODES: &[Node] = &[
-    Node::Choice(SIGN_CHOICES),
-    Node::Subgrammar(&UNARY),
-];
-static UNARY_CHOICES: &[Node] = &[
-    Node::Seq(UNARY_SIGN_NODES),
-    Node::Subgrammar(&PRIMARY),
-];
+static UNARY_SIGN_NODES: &[Node] = &[Node::Choice(SIGN_CHOICES), Node::Subgrammar(&UNARY)];
+static UNARY_CHOICES: &[Node] = &[Node::Seq(UNARY_SIGN_NODES), Node::Subgrammar(&PRIMARY)];
 static UNARY: Node = Node::Choice(UNARY_CHOICES);
 
 // =================================================================
@@ -402,10 +373,7 @@ static SIMPLE_CASE_NODES: &[Node] = &[
     Node::Optional(&ELSE_CLAUSE),
     Node::Word(Word::keyword("end")),
 ];
-static CASE_BODY_CHOICES: &[Node] = &[
-    Node::Seq(SEARCHED_CASE_NODES),
-    Node::Seq(SIMPLE_CASE_NODES),
-];
+static CASE_BODY_CHOICES: &[Node] = &[Node::Seq(SEARCHED_CASE_NODES), Node::Seq(SIMPLE_CASE_NODES)];
 static CASE_NODES: &[Node] = &[
     Node::Word(Word::keyword("case")),
     Node::Choice(CASE_BODY_CHOICES),
@@ -467,14 +435,11 @@ const QUALIFIED_REF_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
-static QUALIFIED_REF_TAIL_NODES: &[Node] = &[
-    Node::Punct('.'),
-    QUALIFIED_REF_IDENT,
-];
+static QUALIFIED_REF_TAIL_NODES: &[Node] = &[Node::Punct('.'), QUALIFIED_REF_IDENT];
 
 static NAME_OR_CALL_TAIL_CHOICES: &[Node] = &[
     Node::Seq(QUALIFIED_REF_TAIL_NODES),
@@ -531,7 +496,10 @@ mod tests {
 
     /// Assert `input` is *not* a complete SQL expression.
     fn bad(input: &str) {
-        assert!(!walks(input), "{input:?} should NOT walk as a complete expression");
+        assert!(
+            !walks(input),
+            "{input:?} should NOT walk as a complete expression"
+        );
     }
 
     #[test]
@@ -643,13 +611,13 @@ mod tests {
 
     #[test]
     fn malformed_expressions_do_not_walk() {
-        bad("a +");          // dangling operator
-        bad("a in b");       // IN requires a parenthesised list
-        bad("= 1");          // no left operand
-        bad("a = ");         // no right operand
-        bad("case a end");   // CASE with no WHEN clause
-        bad("and b");        // leading connective
-        bad("upper(");       // unclosed call
+        bad("a +"); // dangling operator
+        bad("a in b"); // IN requires a parenthesised list
+        bad("= 1"); // no left operand
+        bad("a = "); // no right operand
+        bad("case a end"); // CASE with no WHEN clause
+        bad("and b"); // leading connective
+        bad("upper("); // unclosed call
     }
 
     #[test]
@@ -680,9 +648,9 @@ mod tests {
         // The optional tail dispatches `.identifier` (qualified
         // ref) vs `(args)` (function call) by first token — a
         // bare ident remains a column ref.
-        good("foo(x)");      // function call
-        good("foo.bar");     // qualified ref
-        good("foo");         // bare ref
+        good("foo(x)"); // function call
+        good("foo.bar"); // qualified ref
+        good("foo"); // bare ref
     }
 
     #[test]

src/dsl/grammar/sql_insert.rs

@@ -120,7 +120,10 @@ fn target_value_columns(ctx: &WalkContext) -> Vec<TableColumn> {
             listed
                 .iter()
                 .filter_map(|name| {
-                    table_cols.iter().find(|c| c.name.eq_ignore_ascii_case(name)).cloned()
+                    table_cols
+                        .iter()
+                        .find(|c| c.name.eq_ignore_ascii_case(name))
+                        .cloned()
                 })
                 .collect()
         },
@@ -148,7 +151,11 @@ fn target_value_columns(ctx: &WalkContext) -> Vec<TableColumn> {
 fn tuple_value_list(ctx: &WalkContext, source: &str, pos: usize) -> Node {
     let cols = target_value_columns(ctx);
     let (count, closed) = count_tuple_values(source, pos);
-    let arity_ok = if closed { count == cols.len() } else { count <= cols.len() };
+    let arity_ok = if closed {
+        count == cols.len()
+    } else {
+        count <= cols.len()
+    };
     if !cols.is_empty() && arity_ok {
         Node::DynamicSubgrammar(sql_value_list)
     } else {
@@ -304,8 +311,10 @@ static DO_UPDATE_NODES: &[Node] = &[
 /// the enclosing Seq, each branch's FIRST token (`nothing` vs
 /// `update`) disambiguates, so a non-match of branch 0 is a clean
 /// `NoMatch` that falls through to branch 1.
-static DO_ACTION_CHOICES: &[Node] =
-    &[Node::Word(Word::keyword("nothing")), Node::Seq(DO_UPDATE_NODES)];
+static DO_ACTION_CHOICES: &[Node] = &[
+    Node::Word(Word::keyword("nothing")),
+    Node::Seq(DO_UPDATE_NODES),
+];
 // `const` — used by value in `ON_CONFLICT_CLAUSE_NODES`.
 const DO_ACTION: Node = Node::Choice(DO_ACTION_CHOICES);
 
@@ -361,7 +370,14 @@ mod tests {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        match walk_node(input, 0, &SQL_INSERT_SHAPE, &mut ctx, &mut path, &mut per_byte) {
+        match walk_node(
+            input,
+            0,
+            &SQL_INSERT_SHAPE,
+            &mut ctx,
+            &mut path,
+            &mut per_byte,
+        ) {
             NodeWalkResult::Matched { end, .. } => input[end..].trim().is_empty(),
             _ => false,
         }
@@ -372,7 +388,10 @@ mod tests {
     }
 
     fn bad(input: &str) {
-        assert!(!walks(input), "{input:?} should NOT walk as a complete INSERT tail");
+        assert!(
+            !walks(input),
+            "{input:?} should NOT walk as a complete INSERT tail"
+        );
     }
 
     #[test]
@@ -418,8 +437,12 @@ mod tests {
         // 3h: ON CONFLICT … DO NOTHING / DO UPDATE (ADR-0033 §9).
         good("into t (id, name) values (1, 'x') on conflict (id) do nothing");
         good("into t (id, name) values (1, 'x') on conflict do nothing");
-        good("into t (id, name) values (1, 'x') on conflict (id) do update set name = excluded.name");
-        good("into t (id, name) values (1, 'x') on conflict (id) do update set name = 'y' where id > 0");
+        good(
+            "into t (id, name) values (1, 'x') on conflict (id) do update set name = excluded.name",
+        );
+        good(
+            "into t (id, name) values (1, 'x') on conflict (id) do update set name = 'y' where id > 0",
+        );
         // Multi-column conflict target + multi-assignment DO UPDATE.
         good("into t (a, b) values (1, 2) on conflict (a, b) do update set b = excluded.b, a = 9");
         // ON CONFLICT composes with RETURNING (order: row source,

src/dsl/grammar/sql_select.rs

@@ -141,8 +141,15 @@ static EMPTY_NOMATCH: Node = Node::Choice(&[]);
 /// suffix keywords. `as` is not listed — the AS-form alias is a
 /// separate `Choice` branch that fires before the lookahead.
 const PROJECTION_FOLLOW_SET: &[&str] = &[
-    "from", "where", "group", "order", "having", "limit",
-    "union", "intersect", "except",
+    "from",
+    "where",
+    "group",
+    "order",
+    "having",
+    "limit",
+    "union",
+    "intersect",
+    "except",
     // `returning` belongs to an enclosing DML statement
     // (`INSERT … SELECT … RETURNING …`, ADR-0033 §5), never to a
     // projection item's bare alias — so a no-FROM SELECT row source
@@ -158,9 +165,21 @@ const PROJECTION_FOLLOW_SET: &[&str] = &[
 /// only when `b` has no alias — `on` is not a base-table name a
 /// learner would type as an alias.
 const TABLE_SOURCE_FOLLOW_SET: &[&str] = &[
-    "where", "group", "order", "having", "limit",
-    "union", "intersect", "except",
-    "inner", "left", "right", "full", "cross", "join", "on",
+    "where",
+    "group",
+    "order",
+    "having",
+    "limit",
+    "union",
+    "intersect",
+    "except",
+    "inner",
+    "left",
+    "right",
+    "full",
+    "cross",
+    "join",
+    "on",
     // `returning` belongs to an enclosing DML statement
     // (`INSERT … SELECT … FROM t RETURNING …`, ADR-0033 §5), so the
     // SELECT row source must not read it as table `t`'s bare alias.
@@ -172,15 +191,9 @@ fn peek_next_ident_lower(source: &str, pos: usize) -> Option<String> {
     consume_ident(source, p).map(|(s, e)| source[s..e].to_ascii_lowercase())
 }
 
-fn projection_bare_alias_factory(
-    _: &WalkContext,
-    source: &str,
-    pos: usize,
-) -> Node {
+fn projection_bare_alias_factory(_: &WalkContext, source: &str, pos: usize) -> Node {
     match peek_next_ident_lower(source, pos) {
-        Some(word)
-            if PROJECTION_FOLLOW_SET.iter().any(|k| *k == word) =>
-        {
+        Some(word) if PROJECTION_FOLLOW_SET.iter().any(|k| *k == word) => {
             Node::Subgrammar(&EMPTY_NOMATCH)
         }
         Some(_) => PROJECTION_BARE_ALIAS_IDENT,
@@ -188,15 +201,9 @@ fn projection_bare_alias_factory(
     }
 }
 
-fn table_source_bare_alias_factory(
-    _: &WalkContext,
-    source: &str,
-    pos: usize,
-) -> Node {
+fn table_source_bare_alias_factory(_: &WalkContext, source: &str, pos: usize) -> Node {
     match peek_next_ident_lower(source, pos) {
-        Some(word)
-            if TABLE_SOURCE_FOLLOW_SET.iter().any(|k| *k == word) =>
-        {
+        Some(word) if TABLE_SOURCE_FOLLOW_SET.iter().any(|k| *k == word) => {
             Node::Subgrammar(&EMPTY_NOMATCH)
         }
         Some(_) => TABLE_SOURCE_BARE_ALIAS_IDENT,
@@ -237,14 +244,12 @@ const TABLE_SOURCE_BARE_ALIAS_IDENT: Node = Node::Ident {
     writes_column: false,
     writes_user_listed_column: false,
     writes_table_alias: true,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
-static PROJECTION_AS_ALIAS_NODES: &[Node] = &[
-    Node::Word(Word::keyword("as")),
-    PROJECTION_BARE_ALIAS_IDENT,
-];
+static PROJECTION_AS_ALIAS_NODES: &[Node] =
+    &[Node::Word(Word::keyword("as")), PROJECTION_BARE_ALIAS_IDENT];
 static PROJECTION_AS_ALIAS: Node = Node::Seq(PROJECTION_AS_ALIAS_NODES);
 
 static TABLE_SOURCE_AS_ALIAS_NODES: &[Node] = &[
@@ -258,17 +263,14 @@ static PROJECTION_ALIAS_CHOICES: &[Node] = &[
     Node::Lookahead(projection_bare_alias_factory),
 ];
 static PROJECTION_ALIAS_CHOICE: Node = Node::Choice(PROJECTION_ALIAS_CHOICES);
-static PROJECTION_ALIAS_OPTIONAL: Node =
-    Node::Optional(&PROJECTION_ALIAS_CHOICE);
+static PROJECTION_ALIAS_OPTIONAL: Node = Node::Optional(&PROJECTION_ALIAS_CHOICE);
 
 static TABLE_SOURCE_ALIAS_CHOICES: &[Node] = &[
     Node::Subgrammar(&TABLE_SOURCE_AS_ALIAS),
     Node::Lookahead(table_source_bare_alias_factory),
 ];
-static TABLE_SOURCE_ALIAS_CHOICE: Node =
-    Node::Choice(TABLE_SOURCE_ALIAS_CHOICES);
-static TABLE_SOURCE_ALIAS_OPTIONAL: Node =
-    Node::Optional(&TABLE_SOURCE_ALIAS_CHOICE);
+static TABLE_SOURCE_ALIAS_CHOICE: Node = Node::Choice(TABLE_SOURCE_ALIAS_CHOICES);
+static TABLE_SOURCE_ALIAS_OPTIONAL: Node = Node::Optional(&TABLE_SOURCE_ALIAS_CHOICE);
 
 // =================================================================
 // Projection item
@@ -282,16 +284,13 @@ const QUALIFIED_STAR_QUALIFIER: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
-static QUALIFIED_STAR_NODES: &[Node] = &[
-    QUALIFIED_STAR_QUALIFIER,
-    Node::Punct('.'),
-    Node::Punct('*'),
-];
+static QUALIFIED_STAR_NODES: &[Node] =
+    &[QUALIFIED_STAR_QUALIFIER, Node::Punct('.'), Node::Punct('*')];
 static QUALIFIED_STAR: Node = Node::Seq(QUALIFIED_STAR_NODES);
 
 static PROJECTION_EXPR_ITEM_NODES: &[Node] = &[
@@ -310,11 +309,7 @@ static PROJECTION_EXPR_ITEM: Node = Node::Seq(PROJECTION_EXPR_ITEM_NODES);
 /// ambiguity between `t.*` and `sql_expr` (which can match a
 /// bare `t`), since the walker's `Choice` doesn't backtrack on
 /// a committed match.
-fn projection_item_factory(
-    _: &WalkContext,
-    source: &str,
-    pos: usize,
-) -> Node {
+fn projection_item_factory(_: &WalkContext, source: &str, pos: usize) -> Node {
     let p = skip_whitespace(source, pos);
     let bytes = source.as_bytes();
     if bytes.get(p) == Some(&b'*') {
@@ -363,8 +358,7 @@ static DISTINCT_OR_ALL_CHOICES: &[Node] = &[
     Node::Word(Word::keyword("all")),
 ];
 static DISTINCT_OR_ALL_CHOICE: Node = Node::Choice(DISTINCT_OR_ALL_CHOICES);
-static DISTINCT_OR_ALL_OPTIONAL: Node =
-    Node::Optional(&DISTINCT_OR_ALL_CHOICE);
+static DISTINCT_OR_ALL_OPTIONAL: Node = Node::Optional(&DISTINCT_OR_ALL_CHOICE);
 
 // =================================================================
 // Table source (FROM / JOIN target)
@@ -379,8 +373,8 @@ const TABLE_NAME_IDENT: Node = Node::Ident {
     writes_column: false,
     writes_user_listed_column: false,
     writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 static TABLE_SOURCE_NODES: &[Node] = &[
@@ -395,8 +389,7 @@ static TABLE_SOURCE: Node = Node::Seq(TABLE_SOURCE_NODES);
 
 const JOIN_WORD: Node = Node::Word(Word::keyword("join"));
 const ON_WORD: Node = Node::Word(Word::keyword("on"));
-static OUTER_OPTIONAL: Node =
-    Node::Optional(&Node::Word(Word::keyword("outer")));
+static OUTER_OPTIONAL: Node = Node::Optional(&Node::Word(Word::keyword("outer")));
 
 // `INNER JOIN` and bare `JOIN` are split into two Choice
 // branches so each branch has a distinct leading keyword
@@ -585,8 +578,7 @@ static SET_OP_CHOICES: &[Node] = &[
 ];
 static SET_OP: Node = Node::Choice(SET_OP_CHOICES);
 
-static SET_OP_TAIL_NODES: &[Node] =
-    &[Node::Subgrammar(&SET_OP), Node::Subgrammar(&SELECT_CORE)];
+static SET_OP_TAIL_NODES: &[Node] = &[Node::Subgrammar(&SET_OP), Node::Subgrammar(&SELECT_CORE)];
 static SET_OP_TAIL: Node = Node::Seq(SET_OP_TAIL_NODES);
 
 static PLAIN_COMPOUND_NODES: &[Node] = &[
@@ -619,8 +611,7 @@ static WITH_PREFIXED_COMPOUND_NODES: &[Node] = &[
     Node::Subgrammar(&WITH_CLAUSE),
     Node::Subgrammar(&PLAIN_COMPOUND),
 ];
-static WITH_PREFIXED_COMPOUND: Node =
-    Node::Seq(WITH_PREFIXED_COMPOUND_NODES);
+static WITH_PREFIXED_COMPOUND: Node = Node::Seq(WITH_PREFIXED_COMPOUND_NODES);
 
 static COMPOUND_CHOICES: &[Node] = &[
     Node::Subgrammar(&WITH_PREFIXED_COMPOUND),
@@ -659,9 +650,9 @@ const CTE_COLUMN_IDENT: Node = Node::Ident {
     writes_table: false,
     writes_column: false,
     writes_user_listed_column: false,
-writes_table_alias: false,
-writes_cte_name: false,
-writes_projection_alias: false,
+    writes_table_alias: false,
+    writes_cte_name: false,
+    writes_projection_alias: false,
 };
 
 static CTE_COLUMN_LIST_NODES: &[Node] = &[
@@ -674,18 +665,13 @@ static CTE_COLUMN_LIST_NODES: &[Node] = &[
     RPAREN,
 ];
 static CTE_COLUMN_LIST_SEQ: Node = Node::Seq(CTE_COLUMN_LIST_NODES);
-static CTE_COLUMN_LIST_OPTIONAL: Node =
-    Node::Optional(&CTE_COLUMN_LIST_SEQ);
+static CTE_COLUMN_LIST_OPTIONAL: Node = Node::Optional(&CTE_COLUMN_LIST_SEQ);
 
 // CTE body recursion pushes a fresh lexical scope frame (ADR-
 // 0032 §4 / §10.2). Subqueries in `sql_expr.rs` do the same;
 // the top-level statement's own COMPOUND embedding does not
 // (it shares the implicit bottom frame).
-static CTE_BODY_NODES: &[Node] = &[
-    LPAREN,
-    Node::ScopedSubgrammar(&SQL_SELECT_COMPOUND),
-    RPAREN,
-];
+static CTE_BODY_NODES: &[Node] = &[LPAREN, Node::ScopedSubgrammar(&SQL_SELECT_COMPOUND), RPAREN];
 static CTE_BODY: Node = Node::Seq(CTE_BODY_NODES);
 
 static CTE_DEF_NODES: &[Node] = &[
@@ -807,9 +793,7 @@ mod tests {
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
         match walk_node(input, 0, fragment, &mut ctx, &mut path, &mut per_byte) {
-            NodeWalkResult::Matched { end, .. } => {
-                input[end..].trim().is_empty()
-            }
+            NodeWalkResult::Matched { end, .. } => input[end..].trim().is_empty(),
             _ => false,
         }
     }
@@ -819,10 +803,7 @@ mod tests {
     }
 
     fn good(input: &str) {
-        assert!(
-            walks(input),
-            "{input:?} should be a valid SELECT statement"
-        );
+        assert!(walks(input), "{input:?} should be a valid SELECT statement");
     }
 
     fn bad(input: &str) {
@@ -1051,16 +1032,12 @@ mod tests {
 
     #[test]
     fn set_op_chain() {
-        good(
-            "select a from t union select b from u intersect select c from v",
-        );
+        good("select a from t union select b from u intersect select c from v");
     }
 
     #[test]
     fn set_op_with_outer_order_by_and_limit() {
-        good(
-            "select a from t union select b from u order by a limit 10",
-        );
+        good("select a from t union select b from u order by a limit 10");
     }
 
     // ----- ORDER BY / LIMIT / OFFSET -----
@@ -1126,16 +1103,12 @@ mod tests {
 
     #[test]
     fn recursive_cte() {
-        good(
-            "with recursive r as (select 1 union all select 2) select * from r",
-        );
+        good("with recursive r as (select 1 union all select 2) select * from r");
     }
 
     #[test]
     fn multiple_ctes() {
-        good(
-            "with a as (select 1), b as (select 2) select * from a union select * from b",
-        );
+        good("with a as (select 1), b as (select 2) select * from a union select * from b");
     }
 
     // ----- subquery shapes (recursion through SQL_SELECT_COMPOUND) -----
@@ -1147,9 +1120,7 @@ mod tests {
 
     #[test]
     fn nested_cte_body_with_union() {
-        good(
-            "with x as (select 1 union select 2) select * from x",
-        );
+        good("with x as (select 1 union select 2) select * from x");
     }
 
     // ----- case insensitivity / spacing -----
@@ -1363,9 +1334,7 @@ mod tests {
     #[test]
     fn in_subquery_in_where_clause() {
         good("select * from t where id in (select user_id from orders)");
-        good(
-            "select * from customers where id not in (select customer_id from blocklist)",
-        );
+        good("select * from customers where id not in (select customer_id from blocklist)");
     }
 
     #[test]
@@ -1378,9 +1347,7 @@ mod tests {
 
     #[test]
     fn nested_subqueries() {
-        good(
-            "select * from t where x in (select y from u where y in (select z from v))",
-        );
+        good("select * from t where x in (select y from u where y in (select z from v))");
     }
 
     #[test]
@@ -1393,8 +1360,6 @@ mod tests {
 
     #[test]
     fn cte_body_references_qualified_columns() {
-        good(
-            "with x as (select t.name, t.age from t) select x.name from x",
-        );
+        good("with x as (select t.name, t.age from t) select x.name from x");
     }
 }

src/dsl/grammar/sql_update.rs

@@ -119,7 +119,14 @@ mod tests {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        match walk_node(input, 0, &SQL_UPDATE_SHAPE, &mut ctx, &mut path, &mut per_byte) {
+        match walk_node(
+            input,
+            0,
+            &SQL_UPDATE_SHAPE,
+            &mut ctx,
+            &mut path,
+            &mut per_byte,
+        ) {
             NodeWalkResult::Matched { end, .. } => input[end..].trim().is_empty(),
             _ => false,
         }
@@ -130,7 +137,10 @@ mod tests {
     }
 
     fn bad(input: &str) {
-        assert!(!walks(input), "{input:?} should NOT walk as a complete UPDATE tail");
+        assert!(
+            !walks(input),
+            "{input:?} should NOT walk as a complete UPDATE tail"
+        );
     }
 
     #[test]

src/dsl/mod.rs

@@ -21,9 +21,9 @@ pub mod walker;
 
 pub use action::ReferentialAction;
 pub use command::{
-    AlterTableAction, AppCommand, ChangeColumnMode, ColumnSpec, Command, CompareOp, CopyScope, Expr,
-    IndexSelector, MessagesValue, ModeValue, Operand, Predicate, RelationshipSelector, RowFilter,
-    ShowListKind, SqlForeignKey,
+    AlterTableAction, AppCommand, ChangeColumnMode, ColumnSpec, Command, CompareOp, CopyScope,
+    Expr, IndexSelector, MessagesValue, ModeValue, Operand, Predicate, RelationshipSelector,
+    RowFilter, ShowListKind, SqlForeignKey,
 };
 pub use parser::{ParseError, parse_command};
 pub use types::Type;

src/dsl/parser.rs

@@ -55,10 +55,9 @@ pub enum ParseError {
 impl std::fmt::Display for ParseError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::Invalid { message, .. } => f.write_str(&crate::t!(
-                "parse.error_wrapper",
-                detail = message,
-            )),
+            Self::Invalid { message, .. } => {
+                f.write_str(&crate::t!("parse.error_wrapper", detail = message,))
+            }
             Self::Empty => f.write_str(&crate::t!("parse.empty")),
         }
     }
@@ -125,10 +124,7 @@ pub fn parse_command_with_schema(
 /// Schemaless, mode-aware parse (ADR-0030 §2). In `Mode::Simple`
 /// the walker gates SQL-only commands and produces the
 /// "this is SQL" hint instead of executing them.
-pub fn parse_command_in_mode(
-    input: &str,
-    mode: Mode,
-) -> Result<Command, ParseError> {
+pub fn parse_command_in_mode(input: &str, mode: Mode) -> Result<Command, ParseError> {
     parse_command_inner(input, None, mode)
 }
 
@@ -185,10 +181,8 @@ fn unknown_command_error(source: &str) -> ParseError {
         .collect();
     let joined = oxford_join(&entries);
     let start = skip_whitespace(source, 0);
-    let (position, found_word) = consume_ident(source, start).map_or_else(
-        || (start, None),
-        |(s, e)| (s, Some(&source[s..e])),
-    );
+    let (position, found_word) = consume_ident(source, start)
+        .map_or_else(|| (start, None), |(s, e)| (s, Some(&source[s..e])));
     let message = found_word.map_or_else(
         || format!("expected one of {joined}"),
         |w| format!("expected one of {joined}, found `{w}`"),
@@ -1034,19 +1028,22 @@ mod tests {
             false,
         );
         assert_eq!(
-            ok("add 1:n relationship from Customers.Id to Orders.CustId on delete cascade on update set null"),
+            ok(
+                "add 1:n relationship from Customers.Id to Orders.CustId on delete cascade on update set null"
+            ),
             expected
         );
         assert_eq!(
-            ok("add 1:n relationship from Customers.Id to Orders.CustId on update set null on delete cascade"),
+            ok(
+                "add 1:n relationship from Customers.Id to Orders.CustId on update set null on delete cascade"
+            ),
             expected
         );
     }
 
     #[test]
     fn add_relationship_repeated_clause_errors() {
-        let e =
-            err("add 1:n relationship from C.id to O.cid on delete cascade on delete restrict");
+        let e = err("add 1:n relationship from C.id to O.cid on delete cascade on delete restrict");
         match e {
             ParseError::Invalid { message, .. } => {
                 assert!(message.contains("specified twice"), "{message}");
@@ -1073,7 +1070,9 @@ mod tests {
     #[test]
     fn add_relationship_with_name_actions_and_flag() {
         assert_eq!(
-            ok("add 1:n relationship as cust_orders from Customers.Id to Orders.CustId on delete cascade on update no action --create-fk"),
+            ok(
+                "add 1:n relationship as cust_orders from Customers.Id to Orders.CustId on delete cascade on update no action --create-fk"
+            ),
             rel(
                 Some("cust_orders"),
                 ("Customers", "Id"),
@@ -1300,10 +1299,7 @@ mod tests {
     #[test]
     fn advanced_ambiguous_update_routes_to_sql() {
         assert!(matches!(
-            parse_command_in_mode(
-                "update Orders set total = 0 where id = 1",
-                Mode::Advanced,
-            ),
+            parse_command_in_mode("update Orders set total = 0 where id = 1", Mode::Advanced,),
             Ok(Command::SqlUpdate { .. })
         ));
     }
@@ -1399,10 +1395,7 @@ mod tests {
         // in advanced mode)" pointer is added at the hint layer
         // (input_render), not in the parsed command/error here.
         assert!(matches!(
-            parse_command_in_mode(
-                "delete from Orders where id = 1 returning *",
-                Mode::Simple,
-            ),
+            parse_command_in_mode("delete from Orders where id = 1 returning *", Mode::Simple,),
             Err(ParseError::Invalid { .. })
         ));
     }

src/dsl/shortid.rs

@@ -9,8 +9,7 @@ use rand::RngExt;
 
 /// Base58 alphabet — Bitcoin-style. 0 / O / I / l are excluded
 /// because they are easily confused in print.
-const ALPHABET: &[u8; 58] =
-    b"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+const ALPHABET: &[u8; 58] = b"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
 
 const DEFAULT_LEN: usize = 10;
 

src/dsl/sql_functions.rs

@@ -43,29 +43,9 @@
 /// - **Broader scalars:** `date`, `datetime`, `hex`, `ifnull`,
 ///   `instr`, `nullif`, `random`, `replace`, `strftime`, `typeof`.
 pub const KNOWN_SQL_FUNCTIONS: &[&str] = &[
-    "abs",
-    "avg",
-    "coalesce",
-    "count",
-    "date",
-    "datetime",
-    "hex",
-    "ifnull",
-    "instr",
-    "length",
-    "lower",
-    "max",
-    "min",
-    "nullif",
-    "random",
-    "replace",
-    "round",
-    "strftime",
-    "substr",
-    "sum",
-    "trim",
-    "typeof",
-    "upper",
+    "abs", "avg", "coalesce", "count", "date", "datetime", "hex", "ifnull", "instr", "length",
+    "lower", "max", "min", "nullif", "random", "replace", "round", "strftime", "substr", "sum",
+    "trim", "typeof", "upper",
 ];
 
 /// Whether `partial` is a case-insensitive prefix of at least one
@@ -80,9 +60,7 @@ pub const KNOWN_SQL_FUNCTIONS: &[&str] = &[
 #[must_use]
 pub fn is_known_function_prefix(partial: &str) -> bool {
     let lowered = partial.to_lowercase();
-    KNOWN_SQL_FUNCTIONS
-        .iter()
-        .any(|f| f.starts_with(&lowered))
+    KNOWN_SQL_FUNCTIONS.iter().any(|f| f.starts_with(&lowered))
 }
 
 #[cfg(test)]

src/dsl/types.rs

@@ -59,11 +59,7 @@ impl Type {
     #[must_use]
     pub const fn sqlite_strict_type(self) -> &'static str {
         match self {
-            Self::Text
-            | Self::ShortId
-            | Self::Decimal
-            | Self::Date
-            | Self::DateTime => "TEXT",
+            Self::Text | Self::ShortId | Self::Decimal | Self::Date | Self::DateTime => "TEXT",
             Self::Int | Self::Serial | Self::Bool => "INTEGER",
             Self::Real => "REAL",
             Self::Blob => "BLOB",
@@ -107,10 +103,7 @@ impl Type {
     /// match against a numeric column (ADR-0027, Amendment 1).
     #[must_use]
     pub const fn is_numeric(self) -> bool {
-        matches!(
-            self,
-            Self::Int | Self::Real | Self::Decimal | Self::Serial
-        )
+        matches!(self, Self::Int | Self::Real | Self::Decimal | Self::Serial)
     }
 
     /// The user-facing type that an FK column should use to

src/dsl/value.rs

@@ -129,13 +129,14 @@ impl Value {
 
     fn bind_int(&self, column: &str, ty: Type) -> Result<Bound, ValueError> {
         match self {
-            Self::Number(n) => n
-                .parse::<i64>()
-                .map(Bound::Integer)
-                .map_err(|_| ValueError::Format {
-                    column: column.to_string(),
-                    message: format!("`{n}` is not a valid {ty} (whole number expected)"),
-                }),
+            Self::Number(n) => {
+                n.parse::<i64>()
+                    .map(Bound::Integer)
+                    .map_err(|_| ValueError::Format {
+                        column: column.to_string(),
+                        message: format!("`{n}` is not a valid {ty} (whole number expected)"),
+                    })
+            }
             other => Err(ValueError::TypeMismatch {
                 column: column.to_string(),
                 expected_human: format!("a whole number for `{ty}`"),
@@ -241,9 +242,7 @@ pub(crate) fn validate_date(s: &str) -> Result<(), String> {
     // Expect YYYY-MM-DD: 10 chars, two dashes at fixed positions.
     let bytes = s.as_bytes();
     if bytes.len() != 10 || bytes[4] != b'-' || bytes[7] != b'-' {
-        return Err(format!(
-            "`{s}` is not a date in `YYYY-MM-DD` form"
-        ));
+        return Err(format!("`{s}` is not a date in `YYYY-MM-DD` form"));
     }
     let year = parse_digits(&s[0..4]).ok_or_else(|| format!("`{s}`: invalid year"))?;
     let month = parse_digits(&s[5..7]).ok_or_else(|| format!("`{s}`: invalid month"))?;
@@ -272,7 +271,9 @@ pub(crate) fn validate_datetime(s: &str) -> Result<(), String> {
     validate_date(date_part)?;
     let bytes = s.as_bytes();
     if bytes[10] != b'T' {
-        return Err(format!("`{s}`: missing `T` separator between date and time"));
+        return Err(format!(
+            "`{s}`: missing `T` separator between date and time"
+        ));
     }
     if bytes[13] != b':' || bytes[16] != b':' {
         return Err(format!("`{s}`: time portion must be `HH:MM:SS`"));
@@ -326,8 +327,14 @@ mod tests {
 
     #[test]
     fn integer_for_int_column() {
-        assert_eq!(n("42").bind_for_column("c", Type::Int).unwrap(), Bound::Integer(42));
-        assert_eq!(n("-7").bind_for_column("c", Type::Int).unwrap(), Bound::Integer(-7));
+        assert_eq!(
+            n("42").bind_for_column("c", Type::Int).unwrap(),
+            Bound::Integer(42)
+        );
+        assert_eq!(
+            n("-7").bind_for_column("c", Type::Int).unwrap(),
+            Bound::Integer(-7)
+        );
     }
 
     #[test]
@@ -355,7 +362,9 @@ mod tests {
 
     #[test]
     fn shortid_validation_runs_on_text_for_shortid_column() {
-        let err = t("toolong_xyz_more").bind_for_column("c", Type::ShortId).unwrap_err();
+        let err = t("toolong_xyz_more")
+            .bind_for_column("c", Type::ShortId)
+            .unwrap_err();
         assert!(matches!(err, ValueError::Format { .. }));
 
         // Well-formed shortid binds fine.
@@ -367,8 +376,14 @@ mod tests {
 
     #[test]
     fn bool_for_bool_column_maps_to_zero_or_one() {
-        assert_eq!(Value::Bool(true).bind_for_column("c", Type::Bool).unwrap(), Bound::Integer(1));
-        assert_eq!(Value::Bool(false).bind_for_column("c", Type::Bool).unwrap(), Bound::Integer(0));
+        assert_eq!(
+            Value::Bool(true).bind_for_column("c", Type::Bool).unwrap(),
+            Bound::Integer(1)
+        );
+        assert_eq!(
+            Value::Bool(false).bind_for_column("c", Type::Bool).unwrap(),
+            Bound::Integer(0)
+        );
     }
 
     #[test]
@@ -377,13 +392,17 @@ mod tests {
             t("2025-01-15").bind_for_column("c", Type::Date).unwrap(),
             Bound::Text("2025-01-15".to_string())
         );
-        let err = t("2025/01/15").bind_for_column("c", Type::Date).unwrap_err();
+        let err = t("2025/01/15")
+            .bind_for_column("c", Type::Date)
+            .unwrap_err();
         assert!(matches!(err, ValueError::Format { .. }));
     }
 
     #[test]
     fn date_range_check() {
-        let err = t("2025-13-01").bind_for_column("c", Type::Date).unwrap_err();
+        let err = t("2025-13-01")
+            .bind_for_column("c", Type::Date)
+            .unwrap_err();
         assert!(matches!(err, ValueError::Format { message, .. } if message.contains("month")));
     }
 

src/dsl/walker/driver.rs

@@ -28,12 +28,10 @@ use crate::completion::TableColumn;
 use crate::dsl::grammar::{HighlightClass, Node, ValidationError};
 use crate::dsl::walker::context::WalkContext;
 use crate::dsl::walker::lex_helpers::{
-    consume_bare_path, consume_flag, consume_ident, consume_number_literal,
-    consume_string_literal, skip_whitespace,
-};
-use crate::dsl::walker::outcome::{
-    ByteClass, Expectation, MatchedItem, MatchedKind, MatchedPath,
+    consume_bare_path, consume_flag, consume_ident, consume_number_literal, consume_string_literal,
+    skip_whitespace,
 };
+use crate::dsl::walker::outcome::{ByteClass, Expectation, MatchedItem, MatchedKind, MatchedPath};
 
 /// Maximum nesting of `Node::Subgrammar` frames (ADR-0026 §1).
 ///
@@ -77,10 +75,7 @@ static DYNAMIC_CACHE: LazyLock<Mutex<HashMap<DynamicKey, &'static Node>>> =
 /// Resolve a `DynamicSubgrammar` factory to a `&'static Node`,
 /// reusing a previously-leaked Node when the factory's inputs
 /// match a cached entry.
-fn resolve_dynamic(
-    factory: fn(&WalkContext) -> Node,
-    ctx: &WalkContext,
-) -> &'static Node {
+fn resolve_dynamic(factory: fn(&WalkContext) -> Node, ctx: &WalkContext) -> &'static Node {
     let key = DynamicKey {
         factory: factory as usize,
         current_table_columns: ctx.current_table_columns.clone(),
@@ -123,10 +118,7 @@ pub enum NodeWalkResult {
         expected: Vec<Expectation>,
     },
     /// Committed and hit a hard mismatch or validator failure.
-    Failed {
-        position: usize,
-        kind: FailureKind,
-    },
+    Failed { position: usize, kind: FailureKind },
 }
 
 const fn matched(end: usize) -> NodeWalkResult {
@@ -218,9 +210,7 @@ fn walk_node_inner(
                 kind: FailureKind::Mismatch { expected: vec![] },
             }
         }
-        Node::Subgrammar(inner) => {
-            walk_subgrammar(source, pos, inner, ctx, path, per_byte)
-        }
+        Node::Subgrammar(inner) => walk_subgrammar(source, pos, inner, ctx, path, per_byte),
         Node::ScopedSubgrammar(inner) => {
             walk_scoped_subgrammar(source, pos, inner, ctx, path, per_byte)
         }
@@ -247,8 +237,7 @@ fn walk_node_inner(
             // DynamicSubgrammar wrapper that delegates to the
             // memoized `column_value_list`), so the per-walk
             // leak is a few bytes, not a whole typed tree.
-            let resolved: &'static Node =
-                Box::leak(Box::new(factory(ctx, source, pos)));
+            let resolved: &'static Node = Box::leak(Box::new(factory(ctx, source, pos)));
             walk_node(source, pos, resolved, ctx, path, per_byte)
         }
         Node::SetColumn(col) => {
@@ -262,7 +251,10 @@ fn walk_node_inner(
             let col: &crate::completion::TableColumn = col;
             ctx.current_column = Some(col.clone());
             ctx.pending_value_column = Some(col.name.clone());
-            NodeWalkResult::Matched { end: pos, skipped: Vec::new() }
+            NodeWalkResult::Matched {
+                end: pos,
+                skipped: Vec::new(),
+            }
         }
         Node::TypedValueSlot {
             ty,
@@ -342,7 +334,10 @@ fn walk_word(
             // Amendment 4). Plain keywords leave it `None`.
             class: word.highlight_override.unwrap_or(HighlightClass::Keyword),
         });
-        NodeWalkResult::Matched { end, skipped: Vec::new() }
+        NodeWalkResult::Matched {
+            end,
+            skipped: Vec::new(),
+        }
     } else {
         NodeWalkResult::NoMatch {
             position,
@@ -477,9 +472,7 @@ fn walk_ident(
     // ScopedSubgrammar (which is structurally guaranteed to be
     // the CTE body — no intervening scoped subgrammar in CTE
     // syntax) runs the harvest at body-frame exit.
-    if writes_cte_name
-        && let Some(frame) = ctx.from_scope_stack.last_mut()
-    {
+    if writes_cte_name && let Some(frame) = ctx.from_scope_stack.last_mut() {
         frame
             .cte_bindings
             .push(crate::dsl::walker::context::CteBinding {
@@ -487,13 +480,12 @@ fn walk_ident(
                 columns: Vec::new(),
             });
         let placeholder_index = frame.cte_bindings.len() - 1;
-        ctx.pending_cte_harvest =
-            Some(crate::dsl::walker::context::PendingCteHarvest {
-                placeholder_index,
-                col_list: Vec::new(),
-                cte_name: text.clone(),
-                cte_name_span: (start, end),
-            });
+        ctx.pending_cte_harvest = Some(crate::dsl::walker::context::PendingCteHarvest {
+            placeholder_index,
+            col_list: Vec::new(),
+            cte_name: text.clone(),
+            cte_name_span: (start, end),
+        });
     }
     // ADR-0032 §10.3: the optional `(c1, c2, …)` rename list
     // between the cte name and `AS`. Each `cte_column` ident
@@ -507,9 +499,7 @@ fn walk_ident(
     }
     // ADR-0032 §10.4: projection-list alias accumulator for
     // ORDER BY completion candidates.
-    if writes_projection_alias
-        && let Some(frame) = ctx.from_scope_stack.last_mut()
-    {
+    if writes_projection_alias && let Some(frame) = ctx.from_scope_stack.last_mut() {
         frame.projection_aliases.push(text.clone());
     }
     if writes_column && matches!(src, crate::dsl::grammar::IdentSource::Columns) {
@@ -529,9 +519,7 @@ fn walk_ident(
             .map(|c| c.name.clone())
             .or_else(|| Some(text.clone()));
     }
-    if writes_user_listed_column
-        && matches!(src, crate::dsl::grammar::IdentSource::Columns)
-    {
+    if writes_user_listed_column && matches!(src, crate::dsl::grammar::IdentSource::Columns) {
         // Form A: `insert into <T> (col1, col2, …)`. Append the
         // matched column name to user_listed_columns so the
         // inner `values (…)` slot list mirrors the user's
@@ -564,7 +552,10 @@ fn walk_ident(
         // (issue #8 / ADR-0022 Amendment 4).
         class: highlight_override.unwrap_or(HighlightClass::Identifier),
     });
-    NodeWalkResult::Matched { end, skipped: Vec::new() }
+    NodeWalkResult::Matched {
+        end,
+        skipped: Vec::new(),
+    }
 }
 
 fn walk_string_lit(
@@ -648,7 +639,10 @@ fn walk_literal(
         end,
         class,
     });
-    NodeWalkResult::Matched { end, skipped: Vec::new() }
+    NodeWalkResult::Matched {
+        end,
+        skipped: Vec::new(),
+    }
 }
 
 fn walk_number_lit(
@@ -683,7 +677,10 @@ fn walk_number_lit(
         end,
         class: HighlightClass::Number,
     });
-    NodeWalkResult::Matched { end, skipped: Vec::new() }
+    NodeWalkResult::Matched {
+        end,
+        skipped: Vec::new(),
+    }
 }
 
 fn walk_flag(
@@ -717,7 +714,10 @@ fn walk_flag(
         end,
         class: HighlightClass::Flag,
     });
-    NodeWalkResult::Matched { end, skipped: Vec::new() }
+    NodeWalkResult::Matched {
+        end,
+        skipped: Vec::new(),
+    }
 }
 
 #[allow(clippy::too_many_arguments)]
@@ -784,7 +784,10 @@ fn walk_repeated(
                 count += 1;
                 last_item_skipped = skipped;
             }
-            NodeWalkResult::NoMatch { expected, position: inner_pos } => {
+            NodeWalkResult::NoMatch {
+                expected,
+                position: inner_pos,
+            } => {
                 // Mid-typing-the-next-item recovery: if the
                 // separator just consumed and the inner failed
                 // at EOF, the user is partway through typing the
@@ -860,7 +863,10 @@ fn walk_bare_path(
         end,
         class: HighlightClass::String,
     });
-    NodeWalkResult::Matched { end, skipped: Vec::new() }
+    NodeWalkResult::Matched {
+        end,
+        skipped: Vec::new(),
+    }
 }
 
 fn walk_choice(
@@ -1031,7 +1037,10 @@ fn walk_optional(
                 skipped: expected,
             }
         }
-        NodeWalkResult::Incomplete { position: p, expected } if !inner_committed => {
+        NodeWalkResult::Incomplete {
+            position: p,
+            expected,
+        } if !inner_committed => {
             // Inner reported Incomplete without consuming
             // anything — same as NoMatch from the user's
             // perspective. Roll back and skip.
@@ -1156,9 +1165,7 @@ fn walk_scoped_subgrammar(
     // walks that NoMatch / Incomplete / Fail leave the placeholder
     // empty (the outer-frame state is also discarded in the
     // speculative path, so this is correct).
-    if let (Some(req), NodeWalkResult::Matched { end, .. }) =
-        (pending_cte, &result)
-    {
+    if let (Some(req), NodeWalkResult::Matched { end, .. }) = (pending_cte, &result) {
         run_cte_harvest(ctx, path, source, pos, *end, &req);
     }
 
@@ -1240,9 +1247,8 @@ fn run_cte_harvest(
                 select_idx = Some(i + 1); // start of projection list
             }
             MatchedKind::Word(
-                "from" | "where" | "group" | "having" | "order"
-                | "limit" | "offset" | "union" | "intersect"
-                | "except",
+                "from" | "where" | "group" | "having" | "order" | "limit" | "offset" | "union"
+                | "intersect" | "except",
             ) if select_idx.is_some() => {
                 end_idx = i;
                 break;
@@ -1281,12 +1287,7 @@ fn run_cte_harvest(
     // Classify each projection item per ADR-0032 §10.3.
     let mut derived: Vec<CteColumn> = Vec::new();
     for slice in item_slices {
-        classify_projection_item(
-            slice,
-            body_frame,
-            &ctx.from_scope_stack,
-            &mut derived,
-        );
+        classify_projection_item(slice, body_frame, &ctx.from_scope_stack, &mut derived);
     }
 
     // Apply (c1, c2, …) positional rename if provided. Types
@@ -1339,8 +1340,7 @@ fn run_cte_harvest(
     let stack_len = ctx.from_scope_stack.len();
     if stack_len >= 2
         && let Some(outer) = ctx.from_scope_stack.get_mut(stack_len - 2)
-        && let Some(placeholder) =
-            outer.cte_bindings.get_mut(req.placeholder_index)
+        && let Some(placeholder) = outer.cte_bindings.get_mut(req.placeholder_index)
     {
         placeholder.columns = derived;
     }
@@ -1368,9 +1368,7 @@ fn classify_projection_item(
     // empty because it wasn't a base-table lookup), resolve
     // through to the in-scope CteBinding so nested CTEs project
     // correctly.
-    if expr_slice.len() == 1
-        && matches!(expr_slice[0].kind, MatchedKind::Punct('*'))
-    {
+    if expr_slice.len() == 1 && matches!(expr_slice[0].kind, MatchedKind::Punct('*')) {
         for binding in &body_frame.from_scope {
             for col in expand_binding(binding, scope_stack) {
                 out.push(col);
@@ -1383,7 +1381,10 @@ fn classify_projection_item(
     if expr_slice.len() == 3
         && matches!(
             expr_slice[0].kind,
-            MatchedKind::Ident { role: "qualified_star_qualifier", .. }
+            MatchedKind::Ident {
+                role: "qualified_star_qualifier",
+                ..
+            }
         )
         && matches!(expr_slice[1].kind, MatchedKind::Punct('.'))
         && matches!(expr_slice[2].kind, MatchedKind::Punct('*'))
@@ -1413,11 +1414,7 @@ fn classify_projection_item(
         )
     {
         let col_text = &expr_slice[0].text;
-        let resolved_type = resolve_bare_column_type_in_frame(
-            body_frame,
-            scope_stack,
-            col_text,
-        );
+        let resolved_type = resolve_bare_column_type_in_frame(body_frame, scope_stack, col_text);
         let name = alias.unwrap_or_else(|| col_text.clone());
         out.push(CteColumn {
             name: Some(name),
@@ -1447,12 +1444,7 @@ fn classify_projection_item(
     {
         let qual = &expr_slice[0].text;
         let col_text = &expr_slice[2].text;
-        let resolved_type = resolve_qualified_column_type(
-            body_frame,
-            scope_stack,
-            qual,
-            col_text,
-        );
+        let resolved_type = resolve_qualified_column_type(body_frame, scope_stack, qual, col_text);
         let name = alias.unwrap_or_else(|| col_text.clone());
         out.push(CteColumn {
             name: Some(name),
@@ -1493,16 +1485,8 @@ fn strip_trailing_alias<'a>(
         }
     ) {
         // Optional preceding `AS` keyword.
-        if slice.len() >= 2
-            && matches!(
-                slice[slice.len() - 2].kind,
-                MatchedKind::Word("as")
-            )
-        {
-            return (
-                &slice[..slice.len() - 2],
-                Some(last.text.clone()),
-            );
+        if slice.len() >= 2 && matches!(slice[slice.len() - 2].kind, MatchedKind::Word("as")) {
+            return (&slice[..slice.len() - 2], Some(last.text.clone()));
         }
         return (&slice[..slice.len() - 1], Some(last.text.clone()));
     }
@@ -1613,8 +1597,8 @@ fn merge_expected(dst: &mut Vec<Expectation>, src: Vec<Expectation>) {
 #[cfg(test)]
 mod tests {
     use super::{
-        DYNAMIC_CACHE, FailureKind, MAX_SUBGRAMMAR_DEPTH, NodeWalkResult,
-        resolve_dynamic, walk_node,
+        DYNAMIC_CACHE, FailureKind, MAX_SUBGRAMMAR_DEPTH, NodeWalkResult, resolve_dynamic,
+        walk_node,
     };
     use crate::dsl::grammar::{Node, Word};
     use crate::dsl::walker::context::WalkContext;
@@ -1629,18 +1613,14 @@ mod tests {
         Node::Subgrammar(&NESTED),
         Node::Punct(')'),
     ];
-    static NESTED_CHOICES: &[Node] = &[
-        Node::Seq(NESTED_GROUP),
-        Node::Word(Word::keyword("x")),
-    ];
+    static NESTED_CHOICES: &[Node] = &[Node::Seq(NESTED_GROUP), Node::Word(Word::keyword("x"))];
     static NESTED: Node = Node::Choice(NESTED_CHOICES);
 
     fn walk_nested(input: &str) -> NodeWalkResult {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
-        let result =
-            walk_node(input, 0, &NESTED, &mut ctx, &mut path, &mut per_byte);
+        let result = walk_node(input, 0, &NESTED, &mut ctx, &mut path, &mut per_byte);
         assert_eq!(
             ctx.subgrammar_depth, 0,
             "subgrammar_depth must be restored to 0 after the walk",
@@ -1726,14 +1706,8 @@ mod tests {
     fn resolve_dynamic_cache_is_populated() {
         let ctx = WalkContext::new();
         let _ = resolve_dynamic(const_factory, &ctx);
-        let populated = !DYNAMIC_CACHE
-            .lock()
-            .expect("cache lock")
-            .is_empty();
-        assert!(
-            populated,
-            "resolve_dynamic should populate the memo cache",
-        );
+        let populated = !DYNAMIC_CACHE.lock().expect("cache lock").is_empty();
+        assert!(populated, "resolve_dynamic should populate the memo cache",);
     }
 
     // ---- ScopedSubgrammar (ADR-0032 §10.2) -----------------------
@@ -1758,14 +1732,7 @@ mod tests {
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
         let baseline_frames = ctx.from_scope_stack.len();
-        let result = walk_node(
-            input,
-            0,
-            &SCOPED_NESTED,
-            &mut ctx,
-            &mut path,
-            &mut per_byte,
-        );
+        let result = walk_node(input, 0, &SCOPED_NESTED, &mut ctx, &mut path, &mut per_byte);
         assert_eq!(
             ctx.subgrammar_depth, 0,
             "subgrammar_depth must be restored to 0 after the walk",
@@ -1801,9 +1768,9 @@ mod tests {
                 kind: FailureKind::Validation(err),
                 ..
             } => assert_eq!(err.message_key, "parse.custom.expression_too_deep"),
-            other => panic!(
-                "expected expression_too_deep on pathological scoped nesting, got {other:?}",
-            ),
+            other => {
+                panic!("expected expression_too_deep on pathological scoped nesting, got {other:?}",)
+            }
         }
     }
 
@@ -1822,9 +1789,7 @@ mod tests {
     /// Walk a top-level SQL SELECT and return the bottom frame's
     /// `from_scope` after the walk completes. Used to verify that
     /// `writes_table` / `writes_table_alias` populate bindings.
-    fn from_scope_after_walk(
-        input: &str,
-    ) -> Vec<crate::dsl::walker::context::TableBinding> {
+    fn from_scope_after_walk(input: &str) -> Vec<crate::dsl::walker::context::TableBinding> {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
@@ -1871,9 +1836,7 @@ mod tests {
 
     #[test]
     fn join_pushes_a_second_binding() {
-        let bindings = from_scope_after_walk(
-            "select * from a join b on x = y",
-        );
+        let bindings = from_scope_after_walk("select * from a join b on x = y");
         assert_eq!(bindings.len(), 2);
         assert_eq!(bindings[0].table, "a");
         assert_eq!(bindings[1].table, "b");
@@ -1881,9 +1844,7 @@ mod tests {
 
     #[test]
     fn join_with_aliases() {
-        let bindings = from_scope_after_walk(
-            "select * from a as x join b as y on x.id = y.id",
-        );
+        let bindings = from_scope_after_walk("select * from a as x join b as y on x.id = y.id");
         assert_eq!(bindings.len(), 2);
         assert_eq!(bindings[0].table, "a");
         assert_eq!(bindings[0].alias, Some("x".to_string()));
@@ -1893,9 +1854,8 @@ mod tests {
 
     #[test]
     fn three_way_join_pushes_three_bindings() {
-        let bindings = from_scope_after_walk(
-            "select * from a join b on x = y left join c on y = z",
-        );
+        let bindings =
+            from_scope_after_walk("select * from a join b on x = y left join c on y = z");
         assert_eq!(bindings.len(), 3);
         assert_eq!(bindings[0].table, "a");
         assert_eq!(bindings[1].table, "b");
@@ -1908,9 +1868,8 @@ mod tests {
         // binding into the inner scope frame; on exit, the frame
         // pops and the inner binding is gone. The outer scope's
         // from_scope still contains only `outer_t`.
-        let bindings = from_scope_after_walk(
-            "select * from outer_t where id in (select id from inner_t)",
-        );
+        let bindings =
+            from_scope_after_walk("select * from outer_t where id in (select id from inner_t)");
         assert_eq!(bindings.len(), 1);
         assert_eq!(bindings[0].table, "outer_t");
     }
@@ -1921,9 +1880,8 @@ mod tests {
         // body's scope frame; on body-frame exit, the inner
         // binding goes away. The outer scope contains only
         // the CTE-name reference `cte_x`.
-        let bindings = from_scope_after_walk(
-            "with cte_x as (select * from base_table) select * from cte_x",
-        );
+        let bindings =
+            from_scope_after_walk("with cte_x as (select * from base_table) select * from cte_x");
         assert_eq!(bindings.len(), 1);
         assert_eq!(bindings[0].table, "cte_x");
     }
@@ -1940,10 +1898,7 @@ mod tests {
     /// `cte_bindings` and `projection_aliases` after the walk.
     fn frame_state_after_walk(
         input: &str,
-    ) -> (
-        Vec<crate::dsl::walker::context::CteBinding>,
-        Vec<String>,
-    ) {
+    ) -> (Vec<crate::dsl::walker::context::CteBinding>, Vec<String>) {
         let mut ctx = WalkContext::new();
         let mut path = MatchedPath::new();
         let mut per_byte = Vec::new();
@@ -1968,9 +1923,7 @@ mod tests {
 
     #[test]
     fn cte_name_pushes_placeholder_binding() {
-        let (ctes, _) = frame_state_after_walk(
-            "with cte_x as (select 1) select * from cte_x",
-        );
+        let (ctes, _) = frame_state_after_walk("with cte_x as (select 1) select * from cte_x");
         assert_eq!(ctes.len(), 1);
         assert_eq!(ctes[0].name, "cte_x");
         // §10.3 stage-2 harvest produces one CteColumn per
@@ -1984,9 +1937,8 @@ mod tests {
 
     #[test]
     fn multiple_ctes_push_in_order() {
-        let (ctes, _) = frame_state_after_walk(
-            "with a as (select 1), b as (select 2) select * from b",
-        );
+        let (ctes, _) =
+            frame_state_after_walk("with a as (select 1), b as (select 2) select * from b");
         assert_eq!(ctes.len(), 2);
         assert_eq!(ctes[0].name, "a");
         assert_eq!(ctes[1].name, "b");
@@ -2006,25 +1958,20 @@ mod tests {
 
     #[test]
     fn projection_aliases_captured_via_as_form() {
-        let (_, aliases) = frame_state_after_walk(
-            "select a as alpha, b as beta from t",
-        );
+        let (_, aliases) = frame_state_after_walk("select a as alpha, b as beta from t");
         assert_eq!(aliases, vec!["alpha".to_string(), "beta".to_string()]);
     }
 
     #[test]
     fn projection_aliases_captured_via_bare_form() {
-        let (_, aliases) = frame_state_after_walk(
-            "select a alpha, b beta from t",
-        );
+        let (_, aliases) = frame_state_after_walk("select a alpha, b beta from t");
         assert_eq!(aliases, vec!["alpha".to_string(), "beta".to_string()]);
     }
 
     #[test]
     fn projection_aliases_mixed_forms() {
-        let (_, aliases) = frame_state_after_walk(
-            "select a as alpha, b beta, c, d as delta from t",
-        );
+        let (_, aliases) =
+            frame_state_after_walk("select a as alpha, b beta, c, d as delta from t");
         assert_eq!(
             aliases,
             vec!["alpha".to_string(), "beta".to_string(), "delta".to_string()]
@@ -2033,8 +1980,7 @@ mod tests {
 
     #[test]
     fn projection_aliases_empty_when_no_aliases() {
-        let (_, aliases) =
-            frame_state_after_walk("select a, b from t");
+        let (_, aliases) = frame_state_after_walk("select a, b from t");
         assert!(aliases.is_empty());
     }
 
@@ -2088,9 +2034,24 @@ mod tests {
         s.table_columns.insert(
             "users".to_string(),
             vec![
-                TableColumn { name: "id".to_string(), user_type: Type::Int, not_null: false, has_default: false },
-                TableColumn { name: "name".to_string(), user_type: Type::Text, not_null: false, has_default: false },
-                TableColumn { name: "age".to_string(), user_type: Type::Int, not_null: false, has_default: false },
+                TableColumn {
+                    name: "id".to_string(),
+                    user_type: Type::Int,
+                    not_null: false,
+                    has_default: false,
+                },
+                TableColumn {
+                    name: "name".to_string(),
+                    user_type: Type::Text,
+                    not_null: false,
+                    has_default: false,
+                },
+                TableColumn {
+                    name: "age".to_string(),
+                    user_type: Type::Int,
+                    not_null: false,
+                    has_default: false,
+                },
             ],
         );
         s
@@ -2108,10 +2069,7 @@ mod tests {
         assert_eq!(ctes.len(), 1);
         assert_eq!(ctes[0].columns.len(), 3);
         assert_eq!(ctes[0].columns[0].name.as_deref(), Some("id"));
-        assert_eq!(
-            ctes[0].columns[0].type_,
-            Some(crate::dsl::types::Type::Int),
-        );
+        assert_eq!(ctes[0].columns[0].type_, Some(crate::dsl::types::Type::Int),);
         assert_eq!(ctes[0].columns[1].name.as_deref(), Some("name"));
         assert_eq!(
             ctes[0].columns[1].type_,
@@ -2161,10 +2119,7 @@ mod tests {
         );
         assert_eq!(ctes[0].columns.len(), 1);
         assert_eq!(ctes[0].columns[0].name.as_deref(), Some("age"));
-        assert_eq!(
-            ctes[0].columns[0].type_,
-            Some(crate::dsl::types::Type::Int),
-        );
+        assert_eq!(ctes[0].columns[0].type_, Some(crate::dsl::types::Type::Int),);
     }
 
     #[test]
@@ -2259,15 +2214,9 @@ mod tests {
             .expect("outer_cte binding");
         assert_eq!(outer.columns.len(), 2);
         assert_eq!(outer.columns[0].name.as_deref(), Some("id"));
-        assert_eq!(
-            outer.columns[0].type_,
-            Some(crate::dsl::types::Type::Int),
-        );
+        assert_eq!(outer.columns[0].type_, Some(crate::dsl::types::Type::Int),);
         assert_eq!(outer.columns[1].name.as_deref(), Some("name"));
-        assert_eq!(
-            outer.columns[1].type_,
-            Some(crate::dsl::types::Type::Text),
-        );
+        assert_eq!(outer.columns[1].type_, Some(crate::dsl::types::Type::Text),);
     }
 
     #[test]
@@ -2287,15 +2236,9 @@ mod tests {
         let b = ctes.iter().find(|c| c.name == "b").expect("b binding");
         assert_eq!(b.columns.len(), 2);
         assert_eq!(b.columns[0].name.as_deref(), Some("id"));
-        assert_eq!(
-            b.columns[0].type_,
-            Some(crate::dsl::types::Type::Int),
-        );
+        assert_eq!(b.columns[0].type_, Some(crate::dsl::types::Type::Int),);
         assert_eq!(b.columns[1].name.as_deref(), Some("name"));
-        assert_eq!(
-            b.columns[1].type_,
-            Some(crate::dsl::types::Type::Text),
-        );
+        assert_eq!(b.columns[1].type_, Some(crate::dsl::types::Type::Text),);
     }
 
     #[test]
@@ -2310,10 +2253,7 @@ mod tests {
         );
         assert_eq!(ctes[0].columns.len(), 3);
         assert_eq!(ctes[0].columns[0].name.as_deref(), Some("a"));
-        assert_eq!(
-            ctes[0].columns[0].type_,
-            Some(crate::dsl::types::Type::Int),
-        );
+        assert_eq!(ctes[0].columns[0].type_, Some(crate::dsl::types::Type::Int),);
         assert_eq!(ctes[0].columns[1].name.as_deref(), Some("b"));
         assert_eq!(
             ctes[0].columns[1].type_,

src/dsl/walker/highlight.rs

@@ -24,8 +24,8 @@
 use crate::dsl::grammar::HighlightClass;
 use crate::dsl::walker::context::WalkContext;
 use crate::dsl::walker::lex_helpers::{
-    consume_bare_path, consume_flag, consume_ident, consume_number_literal,
-    consume_string_literal, skip_whitespace,
+    consume_bare_path, consume_flag, consume_ident, consume_number_literal, consume_string_literal,
+    skip_whitespace,
 };
 use crate::dsl::walker::outcome::{ByteClass, WalkBound};
 
@@ -47,16 +47,11 @@ pub fn highlight_runs(source: &str) -> Vec<ByteClass> {
 /// token, producing the keyword classes the renderer needs to
 /// colour `select` / `from` / `where` / `union` / `case` / etc.
 #[must_use]
-pub fn highlight_runs_in_mode(
-    source: &str,
-    mode: crate::mode::Mode,
-) -> Vec<ByteClass> {
+pub fn highlight_runs_in_mode(source: &str, mode: crate::mode::Mode) -> Vec<ByteClass> {
     let mut ctx = WalkContext::new();
     ctx.mode = mode;
     let (result, _cmd) = super::walk(source, WalkBound::EndOfInput, &mut ctx);
-    let mut classes: Vec<ByteClass> = result
-        .map(|r| r.per_byte_class)
-        .unwrap_or_default();
+    let mut classes: Vec<ByteClass> = result.map(|r| r.per_byte_class).unwrap_or_default();
 
     let scan_start = classes.last().map_or(0, |c| c.end);
     scan_remainder(source, scan_start, &mut classes);
@@ -133,9 +128,7 @@ fn scan_remainder(source: &str, start: usize, classes: &mut Vec<ByteClass>) {
                     .get(pos + 1)
                     .copied()
                     .is_some_and(|c| c.is_ascii_digit()));
-        if looks_like_number
-            && let Some((s, e)) = consume_number_literal(source, pos)
-        {
+        if looks_like_number && let Some((s, e)) = consume_number_literal(source, pos) {
             classes.push(ByteClass {
                 start: s,
                 end: e,
@@ -222,8 +215,14 @@ mod tests {
             "no Error highlight on a valid m:n line: {runs:?}"
         );
         let kinds: Vec<HighlightClass> = runs.iter().map(|(_, _, c)| *c).collect();
-        assert!(kinds.contains(&HighlightClass::Keyword), "keywords highlighted: {runs:?}");
-        assert!(kinds.contains(&HighlightClass::Identifier), "table names highlighted: {runs:?}");
+        assert!(
+            kinds.contains(&HighlightClass::Keyword),
+            "keywords highlighted: {runs:?}"
+        );
+        assert!(
+            kinds.contains(&HighlightClass::Identifier),
+            "table names highlighted: {runs:?}"
+        );
     }
 
     #[test]
@@ -276,10 +275,7 @@ mod tests {
     #[test]
     fn flag_classified_via_fallback() {
         // Walker doesn't engage for a bare `--all-rows`.
-        assert_eq!(
-            run("--all-rows"),
-            vec![(0, 10, HighlightClass::Flag)],
-        );
+        assert_eq!(run("--all-rows"), vec![(0, 10, HighlightClass::Flag)],);
     }
 
     #[test]
@@ -445,15 +441,13 @@ mod tests {
         // dispatcher, so only the entry word would highlight).
         let runs = run_advanced("select * from t");
         assert!(
-            runs.iter().any(|(s, e, c)| {
-                *c == HighlightClass::Keyword && (*s, *e) == (0, 6)
-            }),
+            runs.iter()
+                .any(|(s, e, c)| { *c == HighlightClass::Keyword && (*s, *e) == (0, 6) }),
             "expected `select` keyword span 0..6; got {runs:?}",
         );
         assert!(
-            runs.iter().any(|(s, e, c)| {
-                *c == HighlightClass::Keyword && (*s, *e) == (9, 13)
-            }),
+            runs.iter()
+                .any(|(s, e, c)| { *c == HighlightClass::Keyword && (*s, *e) == (9, 13) }),
             "expected `from` keyword span 9..13; got {runs:?}",
         );
     }
@@ -514,18 +508,37 @@ mod tests {
         let insert = keywords_of(
             "insert into t (a) values (1) on conflict (a) do update set a = excluded.a returning a",
         );
-        for kw in ["insert", "into", "values", "on", "conflict", "do", "update", "set", "returning"] {
-            assert!(insert.contains(&kw), "INSERT/UPSERT: missing `{kw}`; got {insert:?}");
+        for kw in [
+            "insert",
+            "into",
+            "values",
+            "on",
+            "conflict",
+            "do",
+            "update",
+            "set",
+            "returning",
+        ] {
+            assert!(
+                insert.contains(&kw),
+                "INSERT/UPSERT: missing `{kw}`; got {insert:?}"
+            );
         }
 
         let update = keywords_of("update t set a = 1 where id = 2 returning a");
         for kw in ["update", "set", "where", "returning"] {
-            assert!(update.contains(&kw), "UPDATE: missing `{kw}`; got {update:?}");
+            assert!(
+                update.contains(&kw),
+                "UPDATE: missing `{kw}`; got {update:?}"
+            );
         }
 
         let delete = keywords_of("delete from t where id = 1 returning *");
         for kw in ["delete", "from", "where", "returning"] {
-            assert!(delete.contains(&kw), "DELETE: missing `{kw}`; got {delete:?}");
+            assert!(
+                delete.contains(&kw),
+                "DELETE: missing `{kw}`; got {delete:?}"
+            );
         }
     }
 }

src/dsl/walker/lex_helpers.rs

@@ -110,9 +110,7 @@ pub fn consume_number_literal(source: &str, start: usize) -> Option<(usize, usiz
         return None;
     }
     let mut i = start;
-    let leading_minus = bytes[i] == b'-'
-        && i + 1 < bytes.len()
-        && bytes[i + 1].is_ascii_digit();
+    let leading_minus = bytes[i] == b'-' && i + 1 < bytes.len() && bytes[i + 1].is_ascii_digit();
     if leading_minus {
         i += 1;
     }

src/echo.rs

@@ -14,12 +14,12 @@
 //! advanced effective mode (ADR-0037).
 
 use crate::app::EffectiveMode;
-use crate::dsl::ReferentialAction;
-use crate::dsl::types::Type;
 use crate::dsl::Command;
+use crate::dsl::ReferentialAction;
 use crate::dsl::command::{
     ColumnSpec, CompareOp, Constraint, ConstraintKind, Expr, Operand, Predicate, RowFilter,
 };
+use crate::dsl::types::Type;
 use crate::dsl::value::Value;
 
 /// The dimmed `Executing SQL:` prefix on a teaching-echo line
@@ -79,7 +79,12 @@ pub fn echo_for_query(
             name,
             filter,
             limit,
-        } => Some(vec![render_show_data(name, filter.as_ref(), *limit, primary_key)]),
+        } => Some(vec![render_show_data(
+            name,
+            filter.as_ref(),
+            *limit,
+            primary_key,
+        )]),
         _ => None,
     }
 }
@@ -150,12 +155,12 @@ pub fn command_to_sql(command: &Command) -> Option<String> {
             column,
             kind,
         } => match kind {
-            ConstraintKind::NotNull => {
-                Some(format!("ALTER TABLE {table} ALTER COLUMN {column} DROP NOT NULL"))
-            }
-            ConstraintKind::Default => {
-                Some(format!("ALTER TABLE {table} ALTER COLUMN {column} DROP DEFAULT"))
-            }
+            ConstraintKind::NotNull => Some(format!(
+                "ALTER TABLE {table} ALTER COLUMN {column} DROP NOT NULL"
+            )),
+            ConstraintKind::Default => Some(format!(
+                "ALTER TABLE {table} ALTER COLUMN {column} DROP DEFAULT"
+            )),
             // A column-level UNIQUE / CHECK is anonymous in our model —
             // no portable name to DROP CONSTRAINT by, so no echo (Bucket C,
             // ADR-0035 Amendment 2 residual gap / ADR-0038 §7).
@@ -169,7 +174,10 @@ pub fn command_to_sql(command: &Command) -> Option<String> {
             table,
             assignments,
             filter: RowFilter::AllRows,
-        } => Some(format!("UPDATE {table} SET {}", render_assignments(assignments))),
+        } => Some(format!(
+            "UPDATE {table} SET {}",
+            render_assignments(assignments)
+        )),
         Command::Delete {
             table,
             filter: RowFilter::AllRows,
@@ -199,7 +207,13 @@ fn render_create_table(name: &str, columns: &[ColumnSpec], primary_key: &[String
             // The same column-constraint suffix `add column` emits (ADR-0029):
             // simple-mode `create table` can carry `default` / `check` too, so
             // the echo must render them or it is not equivalent (§1 contract).
-            append_constraints(&mut s, c.not_null, c.unique, c.default.as_ref(), c.check.as_ref());
+            append_constraints(
+                &mut s,
+                c.not_null,
+                c.unique,
+                c.default.as_ref(),
+                c.check.as_ref(),
+            );
             s
         })
         .collect();
@@ -299,8 +313,10 @@ pub(crate) fn render_create_m2n(
     primary_key: &[String],
     foreign_keys: &[(Vec<String>, String, Vec<String>)],
 ) -> String {
-    let mut parts: Vec<String> =
-        columns.iter().map(|(n, ty)| format!("{n} {}", ty.keyword())).collect();
+    let mut parts: Vec<String> = columns
+        .iter()
+        .map(|(n, ty)| format!("{n} {}", ty.keyword()))
+        .collect();
     parts.push(format!("PRIMARY KEY ({})", primary_key.join(", ")));
     for (child_columns, parent_table, parent_columns) in foreign_keys {
         parts.push(format!(
@@ -368,7 +384,12 @@ pub(crate) fn render_add_relationship_create_fk(
 ) -> Vec<String> {
     let mut lines: Vec<String> = new_columns
         .iter()
-        .map(|(col, ty)| format!("ALTER TABLE {child_table} ADD COLUMN {col} {}", ty.keyword()))
+        .map(|(col, ty)| {
+            format!(
+                "ALTER TABLE {child_table} ADD COLUMN {col} {}",
+                ty.keyword()
+            )
+        })
         .collect();
     lines.push(render_add_relationship(
         name,
@@ -461,7 +482,11 @@ fn predicate_to_sql(predicate: &Predicate) -> String {
             negated,
         } => {
             let not = if *negated { "NOT " } else { "" };
-            format!("{} {not}LIKE {}", operand_to_sql(target), operand_to_sql(pattern))
+            format!(
+                "{} {not}LIKE {}",
+                operand_to_sql(target),
+                operand_to_sql(pattern)
+            )
         }
         Predicate::Between {
             target,
@@ -484,7 +509,11 @@ fn predicate_to_sql(predicate: &Predicate) -> String {
         } => {
             let not = if *negated { "NOT " } else { "" };
             let rendered: Vec<String> = items.iter().map(operand_to_sql).collect();
-            format!("{} {not}IN ({})", operand_to_sql(target), rendered.join(", "))
+            format!(
+                "{} {not}IN ({})",
+                operand_to_sql(target),
+                rendered.join(", ")
+            )
         }
         Predicate::IsNull { target, negated } => {
             let not = if *negated { "NOT " } else { "" };
@@ -562,7 +591,10 @@ mod tests {
     fn create_table_compound_pk_renders_table_level() {
         let cmd = create_table(
             "T",
-            vec![ColumnSpec::new("a", Type::Int), ColumnSpec::new("b", Type::Int)],
+            vec![
+                ColumnSpec::new("a", Type::Int),
+                ColumnSpec::new("b", Type::Int),
+            ],
             &["a", "b"],
         );
         assert_eq!(
@@ -594,7 +626,11 @@ mod tests {
             default: Some(Value::Text("A".to_string())),
             ..ColumnSpec::new("grade", Type::Text)
         };
-        let cmd = create_table("T", vec![ColumnSpec::new("id", Type::Serial), age, grade], &["id"]);
+        let cmd = create_table(
+            "T",
+            vec![ColumnSpec::new("id", Type::Serial), age, grade],
+            &["id"],
+        );
         let sql = command_to_sql(&cmd).expect("echo");
         assert_eq!(
             sql,
@@ -625,11 +661,11 @@ mod tests {
             check: None,
         };
         let sql = command_to_sql(&cmd).expect("echo");
-        assert_eq!(sql, "ALTER TABLE T ADD COLUMN note text NOT NULL DEFAULT 'n/a'");
-        assert!(matches!(
-            reparse(&sql),
-            Ok(Command::SqlAlterTable { .. })
-        ));
+        assert_eq!(
+            sql,
+            "ALTER TABLE T ADD COLUMN note text NOT NULL DEFAULT 'n/a'"
+        );
+        assert!(matches!(reparse(&sql), Ok(Command::SqlAlterTable { .. })));
     }
 
     #[test]
@@ -657,7 +693,10 @@ mod tests {
             })),
         };
         let sql = command_to_sql(&cmd).expect("echo");
-        assert_eq!(sql, "ALTER TABLE T ADD COLUMN score int UNIQUE CHECK (score >= 0)");
+        assert_eq!(
+            sql,
+            "ALTER TABLE T ADD COLUMN score int UNIQUE CHECK (score >= 0)"
+        );
         assert!(matches!(reparse(&sql), Ok(Command::SqlAlterTable { .. })));
     }
 
@@ -1031,7 +1070,10 @@ mod tests {
         let lines = render_drop_column_cascade(
             "Orders",
             "CustId",
-            &["Orders_CustId_idx".to_string(), "Orders_CustId_Day_idx".to_string()],
+            &[
+                "Orders_CustId_idx".to_string(),
+                "Orders_CustId_Day_idx".to_string(),
+            ],
         );
         assert_eq!(
             lines.as_slice(),
@@ -1043,9 +1085,18 @@ mod tests {
         );
         // Each line is itself runnable advanced-mode SQL (the §1 contract
         // holds per line for category 2).
-        assert!(matches!(reparse(&lines[0]), Ok(Command::SqlDropIndex { .. })));
-        assert!(matches!(reparse(&lines[1]), Ok(Command::SqlDropIndex { .. })));
-        assert!(matches!(reparse(&lines[2]), Ok(Command::SqlAlterTable { .. })));
+        assert!(matches!(
+            reparse(&lines[0]),
+            Ok(Command::SqlDropIndex { .. })
+        ));
+        assert!(matches!(
+            reparse(&lines[1]),
+            Ok(Command::SqlDropIndex { .. })
+        ));
+        assert!(matches!(
+            reparse(&lines[2]),
+            Ok(Command::SqlAlterTable { .. })
+        ));
     }
 
     #[test]
@@ -1054,7 +1105,10 @@ mod tests {
         // plain `DROP COLUMN` — still semantically equivalent.
         let lines = render_drop_column_cascade("T", "c", &[]);
         assert_eq!(lines.as_slice(), &["ALTER TABLE T DROP COLUMN c"]);
-        assert!(matches!(reparse(&lines[0]), Ok(Command::SqlAlterTable { .. })));
+        assert!(matches!(
+            reparse(&lines[0]),
+            Ok(Command::SqlAlterTable { .. })
+        ));
     }
 
     #[test]
@@ -1078,8 +1132,14 @@ mod tests {
                 "ALTER TABLE Orders ADD CONSTRAINT Customers_id_to_Orders_CustId FOREIGN KEY (CustId) REFERENCES Customers (id) ON DELETE CASCADE",
             ]
         );
-        assert!(matches!(reparse(&lines[0]), Ok(Command::SqlAlterTable { .. })));
-        assert!(matches!(reparse(&lines[1]), Ok(Command::SqlAlterTable { .. })));
+        assert!(matches!(
+            reparse(&lines[0]),
+            Ok(Command::SqlAlterTable { .. })
+        ));
+        assert!(matches!(
+            reparse(&lines[1]),
+            Ok(Command::SqlAlterTable { .. })
+        ));
     }
 
     #[test]
@@ -1116,8 +1176,16 @@ mod tests {
             ],
             &["Students_id".to_string(), "Courses_id".to_string()],
             &[
-                (vec!["Students_id".to_string()], "Students".to_string(), vec!["id".to_string()]),
-                (vec!["Courses_id".to_string()], "Courses".to_string(), vec!["id".to_string()]),
+                (
+                    vec!["Students_id".to_string()],
+                    "Students".to_string(),
+                    vec!["id".to_string()],
+                ),
+                (
+                    vec!["Courses_id".to_string()],
+                    "Courses".to_string(),
+                    vec!["id".to_string()],
+                ),
             ],
         );
         assert_eq!(
@@ -1172,8 +1240,14 @@ mod tests {
     #[test]
     fn value_literal_renders_null_uppercase_and_quotes_text() {
         assert_eq!(value_to_sql_literal(&Value::Null), "NULL");
-        assert_eq!(value_to_sql_literal(&Value::Text("O'Hara".to_string())), "'O''Hara'");
-        assert_eq!(value_to_sql_literal(&Value::Number("3.14".to_string())), "3.14");
+        assert_eq!(
+            value_to_sql_literal(&Value::Text("O'Hara".to_string())),
+            "'O''Hara'"
+        );
+        assert_eq!(
+            value_to_sql_literal(&Value::Number("3.14".to_string())),
+            "3.14"
+        );
         assert_eq!(value_to_sql_literal(&Value::Bool(false)), "false");
     }
 
@@ -1258,9 +1332,7 @@ mod tests {
                 "Command::App({app:?}) is Bucket C — no echo"
             );
             // Also confirm echo_for gates the same in advanced mode.
-            assert!(
-                echo_for(&Command::App(app), EffectiveMode::AdvancedPersistent).is_none(),
-            );
+            assert!(echo_for(&Command::App(app), EffectiveMode::AdvancedPersistent).is_none(),);
         }
     }
 

src/event.rs

@@ -8,9 +8,8 @@
 use crossterm::event::KeyEvent;
 
 use crate::db::{
-    AddColumnResult, ChangeColumnTypeResult, DataResult, DbError, DeleteResult,
-    DropColumnResult, InsertResult, QueryPlan, RelationshipDiagramData, TableDescription,
-    UpdateResult,
+    AddColumnResult, ChangeColumnTypeResult, DataResult, DbError, DeleteResult, DropColumnResult,
+    InsertResult, QueryPlan, RelationshipDiagramData, TableDescription, UpdateResult,
 };
 use crate::dsl::Command;
 
@@ -73,10 +72,16 @@ pub enum AppEvent {
     },
     /// An `explain …` command succeeded (ADR-0028). `plan`
     /// carries the captured query plan; nothing was executed.
-    DslExplainSucceeded { command: Command, plan: QueryPlan },
+    DslExplainSucceeded {
+        command: Command,
+        plan: QueryPlan,
+    },
     /// A `show <kind>` list command (V5) — carries pre-formatted
     /// display lines (tables / relationships / indexes).
-    DslShowListSucceeded { command: Command, lines: Vec<String> },
+    DslShowListSucceeded {
+        command: Command,
+        lines: Vec<String>,
+    },
     /// `show relationship <name>` (ADR-0044) — structured data for the
     /// diagram, rendered App-side; `None` when no such relationship.
     DslShowRelationshipSucceeded {

src/friendly/format.rs

@@ -43,17 +43,11 @@ impl Catalog {
     }
 }
 
-fn flatten(
-    value: &serde_norway::Value,
-    prefix: String,
-    out: &mut HashMap<String, String>,
-) {
+fn flatten(value: &serde_norway::Value, prefix: String, out: &mut HashMap<String, String>) {
     match value {
         serde_norway::Value::Mapping(map) => {
             for (k, v) in map {
-                let k_str = k
-                    .as_str()
-                    .expect("catalog keys must be strings");
+                let k_str = k.as_str().expect("catalog keys must be strings");
                 let next = if prefix.is_empty() {
                     k_str.to_string()
                 } else {
@@ -85,9 +79,7 @@ pub fn catalog() -> &'static Catalog {
 /// See module docs for failure modes.
 pub fn translate(key: &str, args: &[(&str, &dyn Display)]) -> String {
     let template = catalog().get(key).unwrap_or_else(|| {
-        panic!(
-            "missing catalog key: `{key}` (the validator should have caught this)"
-        );
+        panic!("missing catalog key: `{key}` (the validator should have caught this)");
     });
     substitute(template, args, key)
 }

src/friendly/keys.rs

@@ -41,8 +41,14 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("diagnostic.alias_used_as_column", &["name"]),
     ("diagnostic.ambiguous_column", &["column", "qualifiers"]),
     ("diagnostic.auto_column_overridden", &["column", "type"]),
-    ("diagnostic.compound_arity_mismatch", &["op", "left_n", "right_n"]),
-    ("diagnostic.cte_arity_mismatch", &["cte", "declared", "actual"]),
+    (
+        "diagnostic.compound_arity_mismatch",
+        &["op", "left_n", "right_n"],
+    ),
+    (
+        "diagnostic.cte_arity_mismatch",
+        &["cte", "declared", "actual"],
+    ),
     ("diagnostic.duplicate_cte", &["name"]),
     ("diagnostic.eq_null", &[]),
     ("diagnostic.insert_arity_mismatch", &["expected", "actual"]),
@@ -63,7 +69,10 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ),
     ("diagnostic.not_null_missing", &["column"]),
     ("diagnostic.like_numeric", &["column", "type"]),
-    ("diagnostic.projection_alias_misplaced", &["alias", "clause"]),
+    (
+        "diagnostic.projection_alias_misplaced",
+        &["alias", "clause"],
+    ),
     ("diagnostic.table_used_as_column", &["name"]),
     ("diagnostic.type_mismatch", &["column", "type"]),
     ("diagnostic.unknown_column", &["name", "table"]),
@@ -149,10 +158,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
         "error.type_mismatch.change_column.headline",
         &["table", "column", "src_type", "target_type"],
     ),
-    (
-        "error.type_mismatch.change_column.hint",
-        &["target_type"],
-    ),
+    ("error.type_mismatch.change_column.hint", &["target_type"]),
     (
         "error.type_mismatch.insert.headline",
         &["value", "expected_type"],
@@ -180,6 +186,8 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("help.unknown_topic", &["topic"]),
     ("help.app.quit", &[]),
     ("help.app.help", &[]),
+    ("help.app.hint", &[]),
+    ("help.app.version", &[]),
     ("help.app.rebuild", &[]),
     ("help.app.save", &[]),
     ("help.app.new", &[]),
@@ -217,15 +225,189 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("help.data.explain", &[]),
     // ---- Hint panel ambient typing assistance (ADR-0022 §6) ----
     ("hint.ambient_complete", &[]),
-    (
-        "hint.ambient_error_with_usage",
-        &["message", "usage"],
-    ),
+    ("hint.ambient_error_with_usage", &["message", "usage"]),
     ("hint.ambient_expected", &["expected"]),
-    (
-        "hint.ambient_invalid_ident",
-        &["kind", "found"],
-    ),
+    ("hint.getting_started", &[]),
+    ("hint.block.heading", &[]),
+    ("hint.block.what", &[]),
+    ("hint.block.example", &[]),
+    ("hint.block.concept", &[]),
+    // Tier-3 teaching blocks (ADR-0053 D3) — Phase-B exemplars.
+    ("hint.cmd.insert.what", &[]),
+    ("hint.cmd.insert.example", &[]),
+    ("hint.cmd.insert.concept", &[]),
+    ("hint.cmd.add_relationship.what", &[]),
+    ("hint.cmd.add_relationship.example", &[]),
+    ("hint.cmd.add_relationship.concept", &[]),
+    ("hint.err.foreign_key.child_side.what", &[]),
+    ("hint.err.foreign_key.child_side.example", &[]),
+    ("hint.err.foreign_key.child_side.concept", &[]),
+    // Phase C batch 5 — runtime error-class hints.
+    ("hint.err.foreign_key.parent_side.what", &[]),
+    ("hint.err.foreign_key.parent_side.example", &[]),
+    ("hint.err.foreign_key.parent_side.concept", &[]),
+    ("hint.err.unique.what", &[]),
+    ("hint.err.unique.example", &[]),
+    ("hint.err.unique.concept", &[]),
+    ("hint.err.not_null.what", &[]),
+    ("hint.err.not_null.example", &[]),
+    ("hint.err.not_null.concept", &[]),
+    ("hint.err.check.what", &[]),
+    ("hint.err.check.example", &[]),
+    ("hint.err.check.concept", &[]),
+    ("hint.err.type_mismatch.what", &[]),
+    ("hint.err.type_mismatch.example", &[]),
+    ("hint.err.type_mismatch.concept", &[]),
+    ("hint.err.not_found.what", &[]),
+    ("hint.err.not_found.example", &[]),
+    ("hint.err.not_found.concept", &[]),
+    ("hint.err.already_exists.what", &[]),
+    ("hint.err.already_exists.example", &[]),
+    ("hint.err.already_exists.concept", &[]),
+    ("hint.err.generic.what", &[]),
+    ("hint.err.generic.example", &[]),
+    ("hint.err.invalid_value.what", &[]),
+    ("hint.err.invalid_value.example", &[]),
+    // Phase C batch 1 — app-lifecycle command hints.
+    ("hint.cmd.quit.what", &[]),
+    ("hint.cmd.quit.example", &[]),
+    ("hint.cmd.help.what", &[]),
+    ("hint.cmd.help.example", &[]),
+    ("hint.cmd.help.concept", &[]),
+    ("hint.cmd.hint.what", &[]),
+    ("hint.cmd.hint.example", &[]),
+    ("hint.cmd.version.what", &[]),
+    ("hint.cmd.version.example", &[]),
+    ("hint.cmd.rebuild.what", &[]),
+    ("hint.cmd.rebuild.example", &[]),
+    ("hint.cmd.rebuild.concept", &[]),
+    ("hint.cmd.save.what", &[]),
+    ("hint.cmd.save.example", &[]),
+    ("hint.cmd.save.concept", &[]),
+    ("hint.cmd.new.what", &[]),
+    ("hint.cmd.new.example", &[]),
+    ("hint.cmd.load.what", &[]),
+    ("hint.cmd.load.example", &[]),
+    ("hint.cmd.export.what", &[]),
+    ("hint.cmd.export.example", &[]),
+    ("hint.cmd.export.concept", &[]),
+    ("hint.cmd.import.what", &[]),
+    ("hint.cmd.import.example", &[]),
+    ("hint.cmd.mode.what", &[]),
+    ("hint.cmd.mode.example", &[]),
+    ("hint.cmd.mode.concept", &[]),
+    ("hint.cmd.messages.what", &[]),
+    ("hint.cmd.messages.example", &[]),
+    ("hint.cmd.messages.concept", &[]),
+    ("hint.cmd.undo.what", &[]),
+    ("hint.cmd.undo.example", &[]),
+    ("hint.cmd.undo.concept", &[]),
+    ("hint.cmd.redo.what", &[]),
+    ("hint.cmd.redo.example", &[]),
+    ("hint.cmd.copy.what", &[]),
+    ("hint.cmd.copy.example", &[]),
+    // Phase C batch 2 — DDL command hints.
+    ("hint.cmd.create_table.what", &[]),
+    ("hint.cmd.create_table.example", &[]),
+    ("hint.cmd.create_table.concept", &[]),
+    ("hint.cmd.create_m2n.what", &[]),
+    ("hint.cmd.create_m2n.example", &[]),
+    ("hint.cmd.create_m2n.concept", &[]),
+    ("hint.cmd.add_column.what", &[]),
+    ("hint.cmd.add_column.example", &[]),
+    ("hint.cmd.add_column.concept", &[]),
+    ("hint.cmd.add_index.what", &[]),
+    ("hint.cmd.add_index.example", &[]),
+    ("hint.cmd.add_index.concept", &[]),
+    ("hint.cmd.add_constraint.what", &[]),
+    ("hint.cmd.add_constraint.example", &[]),
+    ("hint.cmd.add_constraint.concept", &[]),
+    ("hint.cmd.drop_table.what", &[]),
+    ("hint.cmd.drop_table.example", &[]),
+    ("hint.cmd.drop_table.concept", &[]),
+    ("hint.cmd.drop_column.what", &[]),
+    ("hint.cmd.drop_column.example", &[]),
+    ("hint.cmd.drop_column.concept", &[]),
+    ("hint.cmd.drop_relationship.what", &[]),
+    ("hint.cmd.drop_relationship.example", &[]),
+    ("hint.cmd.drop_relationship.concept", &[]),
+    ("hint.cmd.drop_index.what", &[]),
+    ("hint.cmd.drop_index.example", &[]),
+    ("hint.cmd.drop_index.concept", &[]),
+    ("hint.cmd.drop_constraint.what", &[]),
+    ("hint.cmd.drop_constraint.example", &[]),
+    ("hint.cmd.drop_constraint.concept", &[]),
+    ("hint.cmd.rename_column.what", &[]),
+    ("hint.cmd.rename_column.example", &[]),
+    ("hint.cmd.rename_column.concept", &[]),
+    ("hint.cmd.change_column.what", &[]),
+    ("hint.cmd.change_column.example", &[]),
+    ("hint.cmd.change_column.concept", &[]),
+    // Phase C batch 3 — DML command hints.
+    ("hint.cmd.update.what", &[]),
+    ("hint.cmd.update.example", &[]),
+    ("hint.cmd.update.concept", &[]),
+    ("hint.cmd.delete.what", &[]),
+    ("hint.cmd.delete.example", &[]),
+    ("hint.cmd.delete.concept", &[]),
+    ("hint.cmd.show_data.what", &[]),
+    ("hint.cmd.show_data.example", &[]),
+    ("hint.cmd.show_data.concept", &[]),
+    ("hint.cmd.show_table.what", &[]),
+    ("hint.cmd.show_table.example", &[]),
+    ("hint.cmd.show_table.concept", &[]),
+    ("hint.cmd.show_tables.what", &[]),
+    ("hint.cmd.show_tables.example", &[]),
+    ("hint.cmd.show_relationships.what", &[]),
+    ("hint.cmd.show_relationships.example", &[]),
+    ("hint.cmd.show_relationships.concept", &[]),
+    ("hint.cmd.show_indexes.what", &[]),
+    ("hint.cmd.show_indexes.example", &[]),
+    ("hint.cmd.show_indexes.concept", &[]),
+    ("hint.cmd.seed.what", &[]),
+    ("hint.cmd.seed.example", &[]),
+    ("hint.cmd.seed.concept", &[]),
+    ("hint.cmd.explain.what", &[]),
+    ("hint.cmd.explain.example", &[]),
+    ("hint.cmd.explain.concept", &[]),
+    ("hint.cmd.replay.what", &[]),
+    ("hint.cmd.replay.example", &[]),
+    ("hint.cmd.replay.concept", &[]),
+    // Phase C batch 4 — advanced-mode SQL command hints.
+    ("hint.cmd.sql_create_table.what", &[]),
+    ("hint.cmd.sql_create_table.example", &[]),
+    ("hint.cmd.sql_create_table.concept", &[]),
+    ("hint.cmd.sql_alter_table.what", &[]),
+    ("hint.cmd.sql_alter_table.example", &[]),
+    ("hint.cmd.sql_alter_table.concept", &[]),
+    ("hint.cmd.sql_create_index.what", &[]),
+    ("hint.cmd.sql_create_index.example", &[]),
+    ("hint.cmd.sql_create_index.concept", &[]),
+    ("hint.cmd.sql_drop_index.what", &[]),
+    ("hint.cmd.sql_drop_index.example", &[]),
+    ("hint.cmd.sql_drop_index.concept", &[]),
+    ("hint.cmd.sql_drop_table.what", &[]),
+    ("hint.cmd.sql_drop_table.example", &[]),
+    ("hint.cmd.sql_drop_table.concept", &[]),
+    ("hint.cmd.sql_insert.what", &[]),
+    ("hint.cmd.sql_insert.example", &[]),
+    ("hint.cmd.sql_insert.concept", &[]),
+    ("hint.cmd.sql_update.what", &[]),
+    ("hint.cmd.sql_update.example", &[]),
+    ("hint.cmd.sql_update.concept", &[]),
+    ("hint.cmd.sql_delete.what", &[]),
+    ("hint.cmd.sql_delete.example", &[]),
+    ("hint.cmd.sql_delete.concept", &[]),
+    ("hint.cmd.select.what", &[]),
+    ("hint.cmd.select.example", &[]),
+    ("hint.cmd.select.concept", &[]),
+    ("hint.cmd.with.what", &[]),
+    ("hint.cmd.with.example", &[]),
+    ("hint.cmd.with.concept", &[]),
+    ("hint.cmd.explain_sql.what", &[]),
+    ("hint.cmd.explain_sql.example", &[]),
+    ("hint.cmd.explain_sql.concept", &[]),
+    ("hint.ambient_invalid_ident", &["kind", "found"]),
     ("hint.ambient_typing_name", &[]),
     // Issue #4: introduce the advanced-mode CREATE TABLE element
     // slot (`create table T (`) so the otherwise-invisible
@@ -233,10 +415,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("hint.create_table_element", &[]),
     ("hint.seed_count", &[]),
     ("hint.value_literal_slot", &[]),
-    (
-        "hint.ambient_typing_name_then",
-        &["next"],
-    ),
+    ("hint.ambient_typing_name_then", &["next"]),
     // Per-column-type value-slot hints (ADR-0024 §Phase D).
     ("hint.value_slot_blob", &[]),
     ("hint.value_slot_bool", &[]),
@@ -259,7 +438,10 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("parse.custom.alter_named_unique", &[]),
     ("parse.custom.bind_type_mismatch", &["found", "expected"]),
     ("parse.custom.change_column_flags_exclusive", &[]),
-    ("parse.custom.constraint_redundant_on_pk", &["column", "constraint"]),
+    (
+        "parse.custom.constraint_redundant_on_pk",
+        &["column", "constraint"],
+    ),
     ("parse.custom.create_table_needs_pk", &[]),
     ("parse.custom.expression_too_deep", &[]),
     ("parse.custom.insert_form_a_missing_values", &["columns"]),
@@ -299,6 +481,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("parse.usage.rename_column", &[]),
     ("parse.usage.export", &[]),
     ("parse.usage.help", &[]),
+    ("parse.usage.hint", &[]),
     ("parse.usage.import", &[]),
     ("parse.usage.copy", &[]),
     ("parse.usage.load", &[]),
@@ -306,6 +489,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("parse.usage.mode", &[]),
     ("parse.usage.new", &[]),
     ("parse.usage.quit", &[]),
+    ("parse.usage.version", &[]),
     ("parse.usage.rebuild", &[]),
     ("parse.usage.redo", &[]),
     ("parse.usage.replay", &[]),
@@ -392,14 +576,12 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
         &["table", "col_count", "col_list", "supplied", "non_auto_csv"],
     ),
     ("select.internal_table", &["table"]),
-    (
-        "cli.invalid_value",
-        &["flag", "value", "expected"],
-    ),
+    ("cli.invalid_value", &["flag", "value", "expected"]),
     ("cli.missing_value", &["flag"]),
     ("cli.multiple_paths", &["first", "second"]),
     ("cli.resume_with_path", &[]),
     ("cli.unknown_argument", &["arg"]),
+    ("cli.version_line", &["version"]),
     (
         "archive.export_sequence_exhausted",
         &["project", "target_dir", "limit"],
@@ -472,6 +654,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("shortcut.confirm", &[]),
     ("shortcut.cycle", &[]),
     ("shortcut.del_word", &[]),
+    ("shortcut.hint", &[]),
     ("shortcut.history", &[]),
     ("shortcut.home_end", &[]),
     ("shortcut.load", &[]),
@@ -681,8 +864,7 @@ mod tests {
             }
         }
 
-        let declared: HashSet<&str> =
-            KEYS_AND_PLACEHOLDERS.iter().map(|(k, _)| *k).collect();
+        let declared: HashSet<&str> = KEYS_AND_PLACEHOLDERS.iter().map(|(k, _)| *k).collect();
         for key in cat.keys() {
             if key.starts_with("_test.") {
                 continue;
@@ -704,9 +886,8 @@ mod tests {
     /// Mirror of `tests/engine_vocabulary_audit.rs::FORBIDDEN`,
     /// duplicated here so the catalog validator is self-contained
     /// (no dependency on the integration-test binary).
-    const FORBIDDEN_ENGINE_VOCABULARY: &[&str] = &[
-        "SQLite", "sqlite", "rusqlite", "STRICT", "PRAGMA",
-    ];
+    const FORBIDDEN_ENGINE_VOCABULARY: &[&str] =
+        &["SQLite", "sqlite", "rusqlite", "STRICT", "PRAGMA"];
 
     /// Detect a `{name:...}` format-specifier placeholder.
     /// Doubled braces `{{` / `}}` are escapes — must skip them.

src/friendly/mod.rs

@@ -34,8 +34,8 @@ pub mod keys;
 pub mod translate;
 
 pub use error::{DiagnosticTable, FriendlyError};
-pub use format::{catalog, Catalog};
-pub use translate::{FailureContext, Operation, TranslateContext, Verbosity};
+pub use format::{Catalog, catalog};
+pub use translate::{FailureContext, Operation, TranslateContext, Verbosity, error_hint_class};
 
 // `translate::translate` and `format::translate` are different
 // callables — the former is the structured DbError → FriendlyError

src/friendly/strings/en-US.yaml

@@ -162,6 +162,10 @@ error:
 # ---- Help text (CLI banner + in-app `help` command) ------------------
 # ---- CLI argument-parsing errors (stderr before TUI starts) ---------
 cli:
+  # Version line for `--version` / `-V` and the in-app `version` command
+  # (ADR-0054). `{version}` is `CARGO_PKG_VERSION` — the single source of
+  # truth, equal to the `v*` release tag (release CI guards the match).
+  version_line: "rdbms-playground {version}"
   missing_value: "missing value for --{flag}"
   invalid_value: "invalid value for --{flag}: {value} (expected one of: {expected})"
   unknown_argument: "unknown argument: {arg}"
@@ -186,6 +190,7 @@ help:
 
     Options:
         -h, --help               Print this help and exit.
+        -V, --version            Print the version and exit.
             --theme <light|dark> Override theme (default: auto-detect).
             --data-dir <PATH>    Use PATH as the data root instead of
                                  the OS-standard location for this run.
@@ -210,6 +215,7 @@ help:
 
     App-level commands (typed inside the app, available in both modes):
         quit                     Exit cleanly.
+        version                  Print the application version.
         mode simple|advanced     Switch input mode.
         help                     Show this list of commands in-app.
         save                     Save the current temp project under a
@@ -256,6 +262,10 @@ help:
     help: |-
         help                       — show this command list
         help <command>             — detailed help for one command (e.g. `help insert`)
+    hint: |-
+        hint                       — explain the most recent error (press F1 for a hint on what you're typing)
+    version: |-
+        version                    — print the application version (same as the `--version` command-line flag)
     rebuild: |-
         rebuild                    — rebuild the project database from project.yaml + data/ (with confirmation)
     save: |-
@@ -386,6 +396,263 @@ hint:
   ambient_complete: "Submit with Enter"
   ambient_expected: "Next: {expected}"
   ambient_error_with_usage: "{message} — usage: {usage}"
+  # H2 / ADR-0053: shown by `hint` / F1 when there is nothing specific
+  # to expand on (no recent error, empty input).
+  getting_started: "Start typing a command and press F1 for a hint, or type `help` for the full command list."
+  # Tier-3 block scaffolding (ADR-0053 D4): the heading + the labels the
+  # `what` / `example` / `concept` parts render under.
+  block:
+    heading: "Hint"
+    what: "What"
+    example: "Example"
+    concept: "Concept"
+  # ── Tier-3 teaching blocks (ADR-0053 D3) ──────────────────────────
+  # Per-form command hints (`hint.cmd.<form>`) and per-class error
+  # hints (`hint.err.<class>`), each a `what` (1–2 sentences) / `example`
+  # (one runnable, mode-correct line) / `concept` (the relational idea —
+  # the teaching part). Phase B seeds the three approved exemplars; the
+  # rest are authored in Phase C.
+  cmd:
+    insert:
+      what: "Add one or more rows to a table."
+      example: "insert into Customers values ('Ann', 'ann@example.io')"
+      concept: "A row is one record; each value lines up with a column, in order. Columns typed `serial`/`shortid` fill themselves — leave them out."
+    add_relationship:
+      what: "Link two tables so a parent row can own many child rows."
+      example: "add 1:n relationship from Customers.id to Orders.customer_id"
+      concept: "The \"1:n\" means one parent, many children. The child column holds the foreign key; add `--create-fk` to create that column if it doesn't exist yet."
+    # App-lifecycle commands (Phase C batch 1). Reference-leaning, so
+    # `concept` appears only where there's a real idea to teach.
+    quit:
+      what: "Leave the playground. Your project is already saved to disk."
+      example: "quit"
+    help:
+      what: "List every command, or show the detail for one."
+      example: "help insert"
+      concept: "`help` is the reference; press F1 while typing for a hint about the command you're building right now."
+    hint:
+      what: "Explain the most recent error — or, pressing F1 while typing, the command you're building."
+      example: "hint"
+    version:
+      what: "Print the application version."
+      example: "version"
+    rebuild:
+      what: "Rebuild the project database from its saved text files."
+      example: "rebuild"
+      concept: "The text files (project.yaml + the data folder) are the source of truth; the database is derived and can always be rebuilt from them."
+    save:
+      what: "Save the current project; `save as` copies it to a new name or location."
+      example: "save as"
+      concept: "On a temporary project, `save` opens a prompt to give it a permanent name; a named project auto-saves as you work, so `save` on one is already done. `save as` always prompts for a new name or path — use it to copy a project."
+    new:
+      what: "Close the current project and start a fresh temporary one."
+      example: "new"
+    load:
+      what: "Open the project picker to switch to a saved project."
+      example: "load"
+    export:
+      what: "Write a shareable zip of the project — its text files only, never the database."
+      example: "export my-shop.zip"
+      concept: "The zip carries the schema and data as text, so anyone can rebuild the very same database from it."
+    import:
+      what: "Unpack a project zip into a new project and switch to it."
+      example: "import my-shop.zip as shop_copy"
+    mode:
+      what: "Switch between simple mode (the guided teaching commands) and advanced mode (raw SQL)."
+      example: "mode advanced"
+      concept: "Simple mode uses keyword commands; advanced mode lets you write SQL directly. A leading `:` runs a single advanced command without switching modes."
+    messages:
+      what: "Show or set how much detail error messages give."
+      example: "messages short"
+      concept: "Verbose (the default) adds a fix-it hint under each error headline; short shows just the headline."
+    undo:
+      what: "Undo the most recent change, after a confirmation."
+      example: "undo"
+      concept: "Every data or schema change is snapshotted first, so you can step back; `redo` re-applies what you undid."
+    redo:
+      what: "Re-apply the most recently undone change."
+      example: "redo"
+    copy:
+      what: "Copy the output panel to the clipboard — all of it, or just the last command's output."
+      example: "copy last"
+    # DDL — schema-shaping commands (Phase C batch 2).
+    create_table:
+      what: "Create a new table and declare its primary key."
+      example: "create table Customers with pk id(serial)"
+      concept: "A table is a set of rows sharing the same columns. `with pk` declares the primary key — one column, or several for a compound key; add the other columns afterwards with `add column`. A `serial` key numbers the rows for you."
+    create_m2n:
+      what: "Create a junction table linking two tables many-to-many."
+      example: "create m:n relationship from Students to Courses"
+      concept: "A many-to-many link (a student takes many courses; a course has many students) can't live in either table, so it gets its own junction table holding a foreign key to each side."
+    add_column:
+      what: "Add a new column to an existing table."
+      example: "add column Customers: phone (text)"
+      concept: "Existing rows take the column's default, or null. A `not null` column with no default can't be added to a table that already has rows — there'd be nothing to put in them."
+    add_index:
+      what: "Create an index on one or more columns to speed up lookups."
+      example: "add index as idx_email on Customers (email)"
+      concept: "An index is a sorted side-structure that makes a lookup like `where email = …` fast, at the cost of a little space and slightly slower writes."
+    add_constraint:
+      what: "Add a constraint — not null, unique, default, or check — to an existing column."
+      example: "add constraint not null to Customers.email"
+      concept: "A constraint is a rule the database enforces on every row. Adding one fails if existing rows already break it, so you fix the data first."
+    drop_table:
+      what: "Remove a table and all of its rows."
+      example: "drop table Customers"
+      concept: "If other tables reference this one through a relationship, drop those relationships (or their child rows) first — the database won't orphan them."
+    drop_column:
+      what: "Remove a column from a table."
+      example: "drop column Customers: phone"
+      concept: "The column's values are lost. You can't drop a primary-key column, or one a relationship depends on."
+    drop_relationship:
+      what: "Remove a relationship between two tables."
+      example: "drop relationship customer_orders"
+      concept: "This drops the foreign-key link and stops the database enforcing it; the tables and their rows stay. The foreign-key column itself remains unless you also drop it."
+    drop_index:
+      what: "Remove an index by name."
+      example: "drop index idx_email"
+      concept: "Only the lookup shortcut goes — the data is untouched. Queries still work, just without that speed-up."
+    drop_constraint:
+      what: "Remove a constraint from a column."
+      example: "drop constraint not null from Customers.email"
+      concept: "The rule stops being enforced from now on; rows already stored are left as they are."
+    rename_column:
+      what: "Rename a column, keeping its values and type."
+      example: "rename column Customers: email to contact_email"
+      concept: "Only the name changes — the stored data is the same. References to the column are reconciled so nothing breaks."
+    change_column:
+      what: "Change a column's type, converting the existing values."
+      example: "change column Customers: status (int)"
+      concept: "The database converts each stored value to the new type; if a value can't convert it refuses the change, so you don't silently lose data. Flags let you force or skip the conversion."
+    # DML — querying and changing data (Phase C batch 3).
+    update:
+      what: "Change values in the rows that match a condition."
+      example: "update Customers set email = 'new@example.io' where id = 1"
+      concept: "The `where` clause picks which rows change, and it's required — pass `--all-rows` to change the whole table on purpose — so you never update more than you meant to."
+    delete:
+      what: "Remove the rows that match a condition."
+      example: "delete from Orders where status = 'cancelled'"
+      concept: "A `where` is required (use `--all-rows` to clear the table on purpose). Rows a relationship points at may be blocked or cascade-deleted, per its `on delete` action."
+    show_data:
+      what: "Show the rows stored in a table."
+      example: "show data Customers"
+      concept: "This reads the data and never changes it. Add a `where` to show only matching rows."
+    show_table:
+      what: "Show a table's structure — its columns, types, keys, and relationships."
+      example: "show table Customers"
+      concept: "Structure, not data: the column definitions and how this table links to others. Use `show data` to see the rows themselves."
+    show_tables:
+      what: "List all the tables in the project."
+      example: "show tables"
+    show_relationships:
+      what: "List all the relationships between tables."
+      example: "show relationships"
+      concept: "Each relationship is a foreign-key link from a child column to a parent's key, with an `on delete` / `on update` rule."
+    show_indexes:
+      what: "List all the indexes in the project."
+      example: "show indexes"
+      concept: "Indexes speed up lookups; this shows which columns each one covers and whether it enforces uniqueness."
+    seed:
+      what: "Fill a table with generated sample rows, or fill one column on existing rows."
+      example: "seed Customers 50"
+      concept: "Seeding invents realistic-looking data so you have something to query. Pin a value with `set col = …`, choose a generator with `as`, or give a numeric range with `between`."
+    explain:
+      what: "Show how the database will run a query — without running it."
+      example: "explain show data Customers where email = 'a@example.io'"
+      concept: "The plan reveals whether the database scans the whole table or jumps straight to rows through an index — the payoff of `add index`. `explain` never executes, so it's safe even on a delete."
+    replay:
+      what: "Re-run the commands recorded in a history file."
+      example: "replay session.log"
+      concept: "Every successful command is journalled, so replaying re-applies them in order to reproduce a project's state — handy for scripting or redoing a sequence."
+    # Advanced-mode SQL forms (Phase C batch 4). Examples are SQL, the
+    # advanced surface — distinct from their simple-mode siblings.
+    sql_create_table:
+      what: "Create a table using SQL syntax (advanced mode)."
+      example: "create table Customers (id int primary key, name text, email text)"
+      concept: "Advanced mode speaks SQL: constraints go inline (`primary key`, `not null`, `unique`, `check`). This is the raw form of simple mode's `create table … with pk …`."
+    sql_alter_table:
+      what: "Change a table's structure with SQL `alter table` (advanced mode)."
+      example: "alter table Customers add column phone text"
+      concept: "`alter table` adds or drops columns, renames, and adds constraints — the SQL equivalent of simple mode's `add column` / `drop column` / `change column`."
+    sql_create_index:
+      what: "Create an index with SQL (advanced mode)."
+      example: "create index ix_email on Customers (email)"
+      concept: "Add `unique` to also forbid duplicate values. The simple-mode equivalent is `add index`."
+    sql_drop_index:
+      what: "Remove an index with SQL (advanced mode)."
+      example: "drop index ix_email"
+      concept: "Only the lookup shortcut goes; the data is untouched. Add `if exists` to ignore a missing index."
+    sql_drop_table:
+      what: "Remove a table with SQL (advanced mode)."
+      example: "drop table Customers"
+      concept: "Add `if exists` to avoid an error when the table might not be there. Relationships pointing at it may block the drop."
+    sql_insert:
+      what: "Insert rows with SQL (advanced mode)."
+      example: "insert into Customers (name, email) values ('Ann', 'ann@example.io')"
+      concept: "Naming the columns lets you supply them in any order and skip ones that have a default — the SQL form of simple mode's `insert`."
+    sql_update:
+      what: "Update rows with SQL (advanced mode)."
+      example: "update Customers set email = 'new@example.io' where id = 1"
+      concept: "`set` lists the new values; `where` picks which rows change. The SQL form of simple mode's `update`."
+    sql_delete:
+      what: "Delete rows with SQL (advanced mode)."
+      example: "delete from Orders where status = 'cancelled'"
+      concept: "`where` picks the rows to remove; foreign-key rules still apply. The SQL form of simple mode's `delete`."
+    select:
+      what: "Query rows with SQL `select` (advanced mode)."
+      example: "select name, email from Customers where id = 1"
+      concept: "`select` is read-only: choose columns (or `*`), filter with `where`, sort with `order by`, cap with `limit`. This is the heart of SQL — and the reason advanced mode exists."
+    with:
+      what: "Name a sub-query (a CTE) and read from it in a `select` (advanced mode)."
+      example: "with recent as (select * from Orders where id > 100) select * from recent"
+      concept: "A `with` clause (Common Table Expression) names a query so the main `select` can use it like a temporary table — handy for breaking a complex query into readable steps."
+    explain_sql:
+      what: "Show how the database will run a SQL query, without running it (advanced mode)."
+      example: "explain select * from Customers where email = 'a@example.io'"
+      concept: "Like simple mode's `explain`, but wraps a raw SQL statement. It reveals whether an index is used, and never executes."
+  err:
+    # Runtime error classes (Phase C batch 5), keyed by
+    # friendly::error_hint_class. `example` is a fix recipe rather than a
+    # runnable line; `concept` is the relational idea behind the rule.
+    foreign_key:
+      child_side:
+        what: "The value you gave for the child column doesn't match any parent row, so the foreign key has nothing to point at."
+        example: "First insert the parent (insert into Customers …), then the child that references it."
+        concept: "A foreign key is a promise that every child points at a real parent, so the parent must exist before a child can reference it. (`on delete` actions like `cascade` or `set null` govern the other direction — what happens to children when their parent is removed — not this one.)"
+      parent_side:
+        what: "You're deleting or changing a row that other rows point at, which would orphan those children."
+        example: "Delete the child rows first, or set the relationship's `on delete` to `cascade` (remove them too) or `set null` (keep them, unlinked)."
+        concept: "A foreign key guarantees every child has a real parent, so the database won't remove a parent out from under its children unless the relationship says what should happen to them."
+    unique:
+      what: "A value you're inserting — or updating to — already exists in a column that must be unique."
+      example: "Pick a different value, or update the existing row instead of inserting a new one."
+      concept: "A unique constraint (and every primary key) forbids duplicates, so each value identifies at most one row."
+    not_null:
+      what: "You left a column empty that is required to have a value."
+      example: "Supply a value for the column, or give it a default so new rows fill it automatically."
+      concept: "A `not null` constraint means every row must have a value there — it's how you mark a fact as mandatory."
+    check:
+      what: "A value broke a `check` rule defined on the column."
+      example: "Use a value the rule allows — for example a positive number, or one of the permitted options."
+      concept: "A `check` constraint is a condition every row must satisfy, so the database enforces business rules like \"price ≥ 0\" for you."
+    type_mismatch:
+      what: "A value doesn't fit the column's type — for instance text where a number is expected."
+      example: "Give a value of the right type: a number for `int`/`real`, a quoted string for `text`, true/false for `bool`."
+      concept: "Every column has a type, and the database rejects values that don't fit, so a column's data stays consistent and comparable."
+    not_found:
+      what: "You named a table or column that doesn't exist."
+      example: "Check the spelling, or run `show tables` (or `show table <name>`) to see what's there."
+      concept: "A command can only refer to tables and columns that already exist — create them first if you need them."
+    already_exists:
+      what: "You tried to create a table, column, relationship, or index whose name is already taken."
+      example: "Pick a different name, or drop the existing one first if you meant to replace it."
+      concept: "Names must be unique within their kind so a command is never ambiguous about what it refers to."
+    generic:
+      what: "The database refused the command for the reason shown above."
+      example: "Read that message for the specifics, adjust the command, and try again."
+    invalid_value:
+      what: "A value or option in the command wasn't valid for where it was used."
+      example: "Check the value against the column's type and the command's accepted options."
   # Invalid identifier in a schema slot (ADR-0022 stage 8e
   # + the user's #5). Voice mirrors ADR-0019's "no such
   # {kind}" wording for consistency with engine errors.
@@ -617,6 +884,8 @@ parse:
     # description.
     quit: "quit"
     help: "help [<command>]"
+    hint: "hint"
+    version: "version"
     rebuild: "rebuild"
     save: "save  |  save as"
     new: "new"
@@ -916,6 +1185,7 @@ shortcut:
   browse: "browse"
   clear: "clear"
   complete: "complete"
+  hint: "hint"
   history: "history"
   home_end: "home/end"
   del_word: "del word"

src/friendly/translate.rs

@@ -201,11 +201,7 @@ impl TranslateContext {
     /// Combine schema-resolved facts with operation and
     /// verbosity to build the full translator input.
     #[must_use]
-    pub fn from_facts(
-        operation: Operation,
-        verbosity: Verbosity,
-        facts: FailureContext,
-    ) -> Self {
+    pub fn from_facts(operation: Operation, verbosity: Verbosity, facts: FailureContext) -> Self {
         Self {
             operation: Some(operation),
             table: facts.table,
@@ -234,15 +230,15 @@ pub fn translate(error: &DbError, ctx: &TranslateContext) -> FriendlyError {
         // refusal sites). Catalog entries exist for the typed
         // invalid-value cases but the migration sweep
         // (ADR-0019 §9) is what wires them. For now, passthrough.
-        DbError::Unsupported(message) | DbError::InvalidValue(message) => {
-            passthrough(message)
-        }
+        DbError::Unsupported(message) | DbError::InvalidValue(message) => passthrough(message),
         DbError::PersistenceFatal { message, .. }
-        | DbError::RebuildRowFailed { detail: message, .. }
+        | DbError::RebuildRowFailed {
+            detail: message, ..
+        }
         | DbError::Io(message) => passthrough(message),
-        DbError::WorkerGone => passthrough(
-            "the database worker is no longer available — the application must restart",
-        ),
+        DbError::WorkerGone => {
+            passthrough("the database worker is no longer available — the application must restart")
+        }
     };
     // Attach the row pinpoint when the runtime resolved one.
     // The translator never builds the table itself — it only
@@ -253,11 +249,74 @@ pub fn translate(error: &DbError, ctx: &TranslateContext) -> FriendlyError {
     fe
 }
 
-fn translate_sqlite(
+/// The tier-3 hint class (`hint.err.<class>`) for an error.
+///
+/// The same classification [`translate`] performs, surfaced as a
+/// stable key for the contextual `hint` (H2 / ADR-0053 D5). Returns
+/// `None` for internal / fatal errors that carry no learner-facing
+/// hint (persistence, IO, worker-gone).
+///
+/// **Keep in sync with [`translate`] / `translate_sqlite` /
+/// `translate_constraint` / `translate_foreign_key`** — the unit tests
+/// below pin each class.
+#[must_use]
+pub fn error_hint_class(error: &DbError, ctx: &TranslateContext) -> Option<&'static str> {
+    match error {
+        DbError::Sqlite { message, kind } => sqlite_hint_class(message, *kind, ctx),
+        DbError::Unsupported(_) | DbError::InvalidValue(_) => Some("invalid_value"),
+        DbError::PersistenceFatal { .. }
+        | DbError::RebuildRowFailed { .. }
+        | DbError::Io(_)
+        | DbError::WorkerGone => None,
+    }
+}
+
+fn sqlite_hint_class(
     message: &str,
     kind: SqliteErrorKind,
     ctx: &TranslateContext,
-) -> FriendlyError {
+) -> Option<&'static str> {
+    if matches!(ctx.operation, Some(Operation::ChangeColumnType)) {
+        return Some("type_mismatch");
+    }
+    Some(match kind {
+        SqliteErrorKind::NoSuchTable | SqliteErrorKind::NoSuchColumn => "not_found",
+        SqliteErrorKind::AlreadyExists => "already_exists",
+        SqliteErrorKind::UniqueViolation => constraint_hint_class(message, ctx),
+        SqliteErrorKind::Other => "generic",
+    })
+}
+
+fn constraint_hint_class(message: &str, ctx: &TranslateContext) -> &'static str {
+    let lower = message.to_ascii_lowercase();
+    if lower.contains("unique constraint failed") {
+        "unique"
+    } else if lower.contains("foreign key constraint failed") {
+        fk_hint_class(ctx)
+    } else if lower.contains("not null constraint failed") {
+        "not_null"
+    } else if lower.contains("check constraint failed") {
+        "check"
+    } else {
+        "generic"
+    }
+}
+
+const fn fk_hint_class(ctx: &TranslateContext) -> &'static str {
+    // Mirrors `translate_foreign_key`'s side disambiguation.
+    if ctx.parent_table.is_some() {
+        return "foreign_key.child_side";
+    }
+    if ctx.child_table.is_some() {
+        return "foreign_key.parent_side";
+    }
+    match ctx.operation {
+        Some(Operation::Delete) => "foreign_key.parent_side",
+        _ => "foreign_key.child_side",
+    }
+}
+
+fn translate_sqlite(message: &str, kind: SqliteErrorKind, ctx: &TranslateContext) -> FriendlyError {
     // `change column ... --dont-convert` lets the engine
     // accept or refuse each cell. Whatever the engine returns
     // (constraint, datatype mismatch, …) means "the new type
@@ -325,8 +384,8 @@ fn translate_constraint(message: &str, ctx: &TranslateContext) -> FriendlyError
 // ---- UNIQUE -----------------------------------------------------
 
 fn translate_unique(message: &str, ctx: &TranslateContext) -> FriendlyError {
-    let (table, column) = parse_qualified_target(message)
-        .unwrap_or_else(|| (ctx_table(ctx), ctx_column(ctx)));
+    let (table, column) =
+        parse_qualified_target(message).unwrap_or_else(|| (ctx_table(ctx), ctx_column(ctx)));
     let value = ctx_value(ctx);
     match ctx.operation {
         Some(Operation::Update) => fe(
@@ -338,11 +397,7 @@ fn translate_unique(message: &str, ctx: &TranslateContext) -> FriendlyError {
             ),
             verbose_hint(
                 ctx,
-                t!(
-                    "error.unique.update.hint",
-                    table = table,
-                    column = column
-                ),
+                t!("error.unique.update.hint", table = table, column = column),
             ),
         ),
         // Default to the INSERT variant — it's the most common
@@ -358,11 +413,7 @@ fn translate_unique(message: &str, ctx: &TranslateContext) -> FriendlyError {
             ),
             verbose_hint(
                 ctx,
-                t!(
-                    "error.unique.insert.hint",
-                    table = table,
-                    column = column
-                ),
+                t!("error.unique.insert.hint", table = table, column = column),
             ),
         ),
     }
@@ -475,8 +526,8 @@ fn fk_parent_side_update(ctx: &TranslateContext) -> FriendlyError {
 // ---- NOT NULL --------------------------------------------------
 
 fn translate_not_null(message: &str, ctx: &TranslateContext) -> FriendlyError {
-    let (table, column) = parse_qualified_target(message)
-        .unwrap_or_else(|| (ctx_table(ctx), ctx_column(ctx)));
+    let (table, column) =
+        parse_qualified_target(message).unwrap_or_else(|| (ctx_table(ctx), ctx_column(ctx)));
     match ctx.operation {
         Some(Operation::Update) => fe(
             t!(
@@ -509,9 +560,17 @@ fn translate_check(_message: &str, ctx: &TranslateContext) -> FriendlyError {
     let column = ctx_column(ctx);
     let is_update = matches!(ctx.operation, Some(Operation::Update));
     let headline = if is_update {
-        t!("error.check.update.headline", table = table, column = column)
+        t!(
+            "error.check.update.headline",
+            table = table,
+            column = column
+        )
     } else {
-        t!("error.check.insert.headline", table = table, column = column)
+        t!(
+            "error.check.insert.headline",
+            table = table,
+            column = column
+        )
     };
     let hint = ctx.check_rule.as_ref().map_or_else(
         || {
@@ -546,8 +605,7 @@ fn translate_check(_message: &str, ctx: &TranslateContext) -> FriendlyError {
 // ---- not_found / already_exists --------------------------------
 
 fn translate_not_found_table(message: &str, ctx: &TranslateContext) -> FriendlyError {
-    let name = parse_after_colon(message)
-        .map_or_else(|| ctx_table(ctx), str::to_string);
+    let name = parse_after_colon(message).map_or_else(|| ctx_table(ctx), str::to_string);
     headline_only(t!("error.not_found.table.headline", name = name))
 }
 
@@ -589,17 +647,11 @@ fn translate_already_exists(message: &str, ctx: &TranslateContext) -> FriendlyEr
                 column = column
             ));
         }
-        return headline_only(t!(
-            "error.already_exists.table.headline",
-            name = name
-        ));
+        return headline_only(t!("error.already_exists.table.headline", name = name));
     }
     // No backticks — engine-style "table T already exists".
     if let Some(name) = parse_after_word(message, "table") {
-        return headline_only(t!(
-            "error.already_exists.table.headline",
-            name = name
-        ));
+        return headline_only(t!("error.already_exists.table.headline", name = name));
     }
     if let Some(name) = parse_after_word(message, "relationship") {
         return headline_only(t!(
@@ -629,36 +681,25 @@ fn translate_generic(message: &str, ctx: &TranslateContext) -> FriendlyError {
     if lower.contains("misuse of aggregate") {
         return headline_only(t!("engine.aggregate_misuse", name = "?"));
     }
-    if lower.contains("group by")
-        || lower.contains("must appear in")
-    {
+    if lower.contains("group by") || lower.contains("must appear in") {
         return headline_only(t!("engine.group_by_required"));
     }
-    if (lower.contains("union")
-        || lower.contains("intersect")
-        || lower.contains("except"))
+    if (lower.contains("union") || lower.contains("intersect") || lower.contains("except"))
         && lower.contains("result columns")
     {
         // Last-resort safety net — the pre-flight pass in 2d.1
         // catches this in most cases; if the engine surfaces it
         // anyway, route it through the engine-neutral key.
-        return headline_only(t!(
-            "engine.compound_arity_mismatch",
-            op = "set operator"
-        ));
+        return headline_only(t!("engine.compound_arity_mismatch", op = "set operator"));
     }
     if lower.contains("scalar subquery") || lower.contains("more than one row") {
         return headline_only(t!("engine.scalar_subquery_too_many_rows"));
     }
-    if lower.contains("recursive")
-        && (lower.contains("cte") || lower.contains("union"))
-    {
+    if lower.contains("recursive") && (lower.contains("cte") || lower.contains("union")) {
         return headline_only(t!("engine.recursive_cte_malformed"));
     }
 
-    let operation = ctx
-        .operation
-        .map_or("operation", Operation::keyword);
+    let operation = ctx.operation.map_or("operation", Operation::keyword);
     // F2 (ADR-0035 Amendment 1): when no table is in context, use the
     // table-less hint so a contextless `friendly_message()` (replay, undo,
     // rebuild, export) never renders a literal `{table}` placeholder.
@@ -722,23 +763,33 @@ fn ctx_table(ctx: &TranslateContext) -> String {
 }
 
 fn ctx_column(ctx: &TranslateContext) -> String {
-    ctx.column.clone().unwrap_or_else(|| "the column".to_string())
+    ctx.column
+        .clone()
+        .unwrap_or_else(|| "the column".to_string())
 }
 
 fn ctx_value(ctx: &TranslateContext) -> String {
-    ctx.value.clone().unwrap_or_else(|| "that value".to_string())
+    ctx.value
+        .clone()
+        .unwrap_or_else(|| "that value".to_string())
 }
 
 fn ctx_parent_table(ctx: &TranslateContext) -> String {
-    ctx.parent_table.clone().unwrap_or_else(|| "the referenced table".to_string())
+    ctx.parent_table
+        .clone()
+        .unwrap_or_else(|| "the referenced table".to_string())
 }
 
 fn ctx_parent_column(ctx: &TranslateContext) -> String {
-    ctx.parent_column.clone().unwrap_or_else(|| "the referenced column".to_string())
+    ctx.parent_column
+        .clone()
+        .unwrap_or_else(|| "the referenced column".to_string())
 }
 
 fn ctx_child_table(ctx: &TranslateContext) -> String {
-    ctx.child_table.clone().unwrap_or_else(|| "the referencing table".to_string())
+    ctx.child_table
+        .clone()
+        .unwrap_or_else(|| "the referencing table".to_string())
 }
 
 /// Extract `T.col` from a message like
@@ -780,11 +831,7 @@ fn parse_after_word<'a>(message: &'a str, keyword: &str) -> Option<&'a str> {
     let rest = message[pos..].trim_start();
     let token_end = rest.find(|c: char| c.is_whitespace()).unwrap_or(rest.len());
     let token = rest[..token_end].trim_matches(|c: char| c == '`' || c == '\'');
-    if token.is_empty() {
-        None
-    } else {
-        Some(token)
-    }
+    if token.is_empty() { None } else { Some(token) }
 }
 
 #[cfg(test)]
@@ -798,6 +845,107 @@ mod tests {
         }
     }
 
+    // ── H2 / ADR-0053: error → tier-3 hint class ────────────────
+
+    #[test]
+    fn hint_class_maps_runtime_error_kinds() {
+        use crate::db::{DbError, SqliteErrorKind};
+        let sqlite = |kind, msg: &str| DbError::Sqlite {
+            message: msg.to_string(),
+            kind,
+        };
+        let d = TranslateContext::default;
+        assert_eq!(
+            error_hint_class(
+                &sqlite(SqliteErrorKind::NoSuchTable, "no such table: X"),
+                &d()
+            ),
+            Some("not_found")
+        );
+        assert_eq!(
+            error_hint_class(
+                &sqlite(SqliteErrorKind::NoSuchColumn, "no such column: X"),
+                &d()
+            ),
+            Some("not_found")
+        );
+        assert_eq!(
+            error_hint_class(
+                &sqlite(SqliteErrorKind::AlreadyExists, "already exists"),
+                &d()
+            ),
+            Some("already_exists")
+        );
+        assert_eq!(
+            error_hint_class(&sqlite(SqliteErrorKind::Other, "boom"), &d()),
+            Some("generic")
+        );
+        // Constraint-violation message splitting.
+        let cv = |msg: &str| sqlite(SqliteErrorKind::UniqueViolation, msg);
+        assert_eq!(
+            error_hint_class(&cv("UNIQUE constraint failed: T.c"), &d()),
+            Some("unique")
+        );
+        assert_eq!(
+            error_hint_class(&cv("NOT NULL constraint failed: T.c"), &d()),
+            Some("not_null")
+        );
+        assert_eq!(
+            error_hint_class(&cv("CHECK constraint failed: T"), &d()),
+            Some("check")
+        );
+        // change-column op routes any engine error to type_mismatch.
+        assert_eq!(
+            error_hint_class(
+                &sqlite(SqliteErrorKind::Other, "x"),
+                &ctx_with(Operation::ChangeColumnType)
+            ),
+            Some("type_mismatch")
+        );
+        // App-level refusals and internal/fatal errors.
+        assert_eq!(
+            error_hint_class(&DbError::InvalidValue("bad".to_string()), &d()),
+            Some("invalid_value")
+        );
+        assert_eq!(error_hint_class(&DbError::WorkerGone, &d()), None);
+    }
+
+    #[test]
+    fn hint_class_resolves_foreign_key_sides() {
+        use crate::db::{DbError, SqliteErrorKind};
+        let fk = || DbError::Sqlite {
+            message: "FOREIGN KEY constraint failed".to_string(),
+            kind: SqliteErrorKind::UniqueViolation,
+        };
+        // Enrichment: parent_table populated → child-side.
+        let ctx = TranslateContext {
+            parent_table: Some("Parent".to_string()),
+            ..TranslateContext::default()
+        };
+        assert_eq!(
+            error_hint_class(&fk(), &ctx),
+            Some("foreign_key.child_side")
+        );
+        // child_table populated → parent-side.
+        let ctx = TranslateContext {
+            child_table: Some("Child".to_string()),
+            ..TranslateContext::default()
+        };
+        assert_eq!(
+            error_hint_class(&fk(), &ctx),
+            Some("foreign_key.parent_side")
+        );
+        // No enrichment: operation is the tiebreaker.
+        assert_eq!(
+            error_hint_class(&fk(), &ctx_with(Operation::Delete)),
+            Some("foreign_key.parent_side")
+        );
+        assert_eq!(
+            error_hint_class(&fk(), &ctx_with(Operation::Insert)),
+            Some("foreign_key.child_side")
+        );
+    }
+
     fn sqlite(message: &str, kind: SqliteErrorKind) -> DbError {
         DbError::Sqlite {
             message: message.to_string(),
@@ -896,14 +1044,22 @@ mod tests {
         ctx.parent_column = Some("country, code".to_string());
         ctx.value = Some("7, 8".to_string());
         let f = translate(&err, &ctx);
-        assert!(f.headline.contains("no parent row"), "child-side: {}", f.headline);
+        assert!(
+            f.headline.contains("no parent row"),
+            "child-side: {}",
+            f.headline
+        );
         assert!(f.headline.contains("Region"));
         assert!(
             f.headline.contains("country, code"),
             "both parent columns must appear: {}",
             f.headline
         );
-        assert!(f.headline.contains("`7, 8`"), "joined value: {}", f.headline);
+        assert!(
+            f.headline.contains("`7, 8`"),
+            "joined value: {}",
+            f.headline
+        );
     }
 
     #[test]

src/input_render.rs

@@ -25,9 +25,9 @@
 use ratatui::style::{Color, Modifier, Style};
 
 use crate::dsl::parser::{parse_command_with_schema, parse_command_with_schema_in_mode};
-use crate::mode::Mode;
 use crate::dsl::walker;
 use crate::dsl::{ParseError, parse_command};
+use crate::mode::Mode;
 use crate::theme::Theme;
 
 /// A run of text with its byte range in the source and the
@@ -85,7 +85,16 @@ pub fn render_input_runs_in_mode(
     mode: Mode,
 ) -> Vec<StyledRun> {
     // Identity feedback view — highlight/overlay the whole input.
-    render_input_runs_feedback(input, cursor_byte, theme, cache, mode, input, cursor_byte, 0)
+    render_input_runs_feedback(
+        input,
+        cursor_byte,
+        theme,
+        cache,
+        mode,
+        input,
+        cursor_byte,
+        0,
+    )
 }
 
 /// [`render_input_runs_in_mode`] with a separate **feedback view** for
@@ -121,12 +130,14 @@ pub fn render_input_runs_feedback(
             byte_range: (0, offset),
             style: ratatui::style::Style::default().fg(theme.fg),
         }];
-        r.extend(lex_to_runs_in_mode(view, theme, mode).into_iter().map(|run| {
-            StyledRun {
-                byte_range: (run.byte_range.0 + offset, run.byte_range.1 + offset),
-                ..run
-            }
-        }));
+        r.extend(
+            lex_to_runs_in_mode(view, theme, mode)
+                .into_iter()
+                .map(|run| StyledRun {
+                    byte_range: (run.byte_range.0 + offset, run.byte_range.1 + offset),
+                    ..run
+                }),
+        );
         r
     };
     if let InputState::DefiniteErrorAt(pos) =
@@ -150,7 +161,11 @@ pub fn render_input_runs_feedback(
             walker::Severity::Error => theme.tok_error,
             walker::Severity::Warning => theme.warning,
         };
-        overlay_span(&mut runs, (diag.span.0 + offset, diag.span.1 + offset), colour);
+        overlay_span(
+            &mut runs,
+            (diag.span.0 + offset, diag.span.1 + offset),
+            colour,
+        );
     }
     inject_cursor(&mut runs, input, cursor_byte, theme);
     runs
@@ -234,9 +249,7 @@ pub fn classify_input_with_schema_in_mode(
     ))
 }
 
-fn classify_parse_result(
-    result: Result<crate::dsl::Command, ParseError>,
-) -> InputState {
+fn classify_parse_result(result: Result<crate::dsl::Command, ParseError>) -> InputState {
     match result {
         Ok(_) => InputState::Valid,
         Err(ParseError::Empty) => InputState::Empty,
@@ -372,8 +385,7 @@ pub fn advanced_alternative_note(
     // carries a blocking ERROR diagnostic such as a value-count
     // mismatch. Incomplete input (still being typed) and empty input are
     // excluded so the pointer doesn't flicker mid-keystroke.
-    let definite_dsl_error = match classify_input_with_schema_in_mode(input, cache, Mode::Simple)
-    {
+    let definite_dsl_error = match classify_input_with_schema_in_mode(input, cache, Mode::Simple) {
         InputState::DefiniteErrorAt(_) => true,
         InputState::Valid => {
             crate::dsl::walker::input_verdict_in_mode(input, Some(cache), Mode::Simple)
@@ -386,8 +398,7 @@ pub fn advanced_alternative_note(
     }
     // The validity-verdict-driven gate (ADR-0033 Amendment 5): the
     // line must be fully valid (verdict `None`) in advanced mode.
-    if crate::dsl::walker::input_verdict_in_mode(input, Some(cache), Mode::Advanced).is_some()
-    {
+    if crate::dsl::walker::input_verdict_in_mode(input, Some(cache), Mode::Advanced).is_some() {
         return None;
     }
     Some(crate::t!("advanced_mode.also_valid_sql"))
@@ -714,8 +725,7 @@ fn ambient_hint_core_in_mode(
     // narrows column candidates to the active table and runs the
     // §10.6 look-ahead, so it is the authoritative "what can go
     // here" set.
-    let completion =
-        crate::completion::candidates_at_cursor_in_mode(input, cursor, cache, mode);
+    let completion = crate::completion::candidates_at_cursor_in_mode(input, cursor, cache, mode);
 
     // Schema-aware diagnostics (ADR-0027 §2). `input_diagnostics`
     // is non-empty only for a command that *structurally parses*
@@ -834,7 +844,9 @@ fn ambient_hint_core_in_mode(
             // keyword set.
             return Some(AmbientHint::Prose(crate::friendly::translate(key, &[])));
         }
-        Some(crate::dsl::grammar::HintMode::SuppressProse | crate::dsl::grammar::HintMode::Default)
+        Some(
+            crate::dsl::grammar::HintMode::SuppressProse | crate::dsl::grammar::HintMode::Default,
+        )
         | None => {}
     }
 
@@ -855,7 +867,8 @@ fn ambient_hint_core_in_mode(
     // Invalid identifier: cursor sits in a known-set slot but
     // the typed prefix matches nothing in the schema. (Stage
     // 8e / the user's #5.)
-    if let Some(inv) = crate::completion::invalid_ident_at_cursor_in_mode(input, cursor, cache, mode)
+    if let Some(inv) =
+        crate::completion::invalid_ident_at_cursor_in_mode(input, cursor, cache, mode)
     {
         let kind = match inv.source {
             crate::dsl::grammar::IdentSource::Tables => "table",
@@ -1036,11 +1049,7 @@ pub fn lex_to_runs(input: &str, theme: &Theme) -> Vec<StyledRun> {
 /// with `Mode::Advanced` so SQL keywords past the entry word
 /// match and get highlighted (ADR-0030 §8).
 #[must_use]
-pub fn lex_to_runs_in_mode(
-    input: &str,
-    theme: &Theme,
-    mode: Mode,
-) -> Vec<StyledRun> {
+pub fn lex_to_runs_in_mode(input: &str, theme: &Theme, mode: Mode) -> Vec<StyledRun> {
     base_runs(input, theme, mode)
 }
 
@@ -1076,12 +1085,7 @@ fn base_runs(input: &str, theme: &Theme, mode: Mode) -> Vec<StyledRun> {
     runs
 }
 
-fn inject_cursor(
-    runs: &mut Vec<StyledRun>,
-    input: &str,
-    cursor_byte: usize,
-    theme: &Theme,
-) {
+fn inject_cursor(runs: &mut Vec<StyledRun>, input: &str, cursor_byte: usize, theme: &Theme) {
     let cursor_byte = cursor_byte.min(input.len());
 
     // End-of-input cursor: append the empty-range sentinel.
@@ -1164,9 +1168,10 @@ mod tests {
         let mut cache = SchemaCache::default();
         cache.tables.push("Customers".into());
         cache.columns.push("name".into());
-        cache
-            .table_columns
-            .insert("Customers".into(), vec![TableColumn::new("name", Type::Text)]);
+        cache.table_columns.insert(
+            "Customers".into(),
+            vec![TableColumn::new("name", Type::Text)],
+        );
         let input = ": select name from Customers";
         let view = "select name from Customers";
         let offset = 2; // ": "
@@ -1362,9 +1367,10 @@ mod tests {
         let mut cache = crate::completion::SchemaCache::default();
         cache.tables.push("users".to_string());
         cache.columns.push("email".to_string());
-        cache
-            .table_columns
-            .insert("users".to_string(), vec![TableColumn::new("email", Type::Text)]);
+        cache.table_columns.insert(
+            "users".to_string(),
+            vec![TableColumn::new("email", Type::Text)],
+        );
         cache
     }
 
@@ -1392,7 +1398,10 @@ mod tests {
         }
         // Tab candidates remain available (completion is independent).
         let comp = crate::completion::candidates_at_cursor_in_mode(
-            input, input.len(), &cache, Mode::Simple,
+            input,
+            input.len(),
+            &cache,
+            Mode::Simple,
         )
         .expect("completion remains available");
         let texts: Vec<&str> = comp.candidates.iter().map(|c| c.text.as_str()).collect();
@@ -1424,7 +1433,10 @@ mod tests {
                 &hint,
                 Some(AmbientHint::Prose(p)) if p.contains("row count")
             );
-            assert!(!is_count_prose, "count hint must not show for {input:?}; got {hint:?}");
+            assert!(
+                !is_count_prose,
+                "count hint must not show for {input:?}; got {hint:?}"
+            );
         }
     }
 
@@ -1502,14 +1514,12 @@ mod tests {
         use crate::dsl::types::Type;
         let mut cache = SchemaCache::default();
         cache.tables.push("Customers".to_string());
-        let tc = vec![
-            TableColumn {
-                name: "Age".to_string(),
-                user_type: Type::Int,
-                not_null: false,
-                has_default: false,
-            },
-        ];
+        let tc = vec![TableColumn {
+            name: "Age".to_string(),
+            user_type: Type::Int,
+            not_null: false,
+            has_default: false,
+        }];
         for c in &tc {
             cache.columns.push(c.name.clone());
         }
@@ -1551,9 +1561,7 @@ mod tests {
                 p.contains("No such") && p.contains("Agx"),
                 "a genuine column typo before FROM must warn at typing time; got: {p:?}",
             ),
-            other => panic!(
-                "`select Agx` must surface a typing-time typo hint; got: {other:?}",
-            ),
+            other => panic!("`select Agx` must surface a typing-time typo hint; got: {other:?}",),
         }
     }
 
@@ -1652,8 +1660,7 @@ mod tests {
         // ADR-0022 Amendment 1: advanced-mode ambient assistance
         // surfaces SQL completion candidates (here the FROM-slot
         // table) instead of the simple-mode "this is SQL" gate.
-        let cache =
-            schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
+        let cache = schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
         let input = "select * from ";
         match ambient_hint_in_mode(
             input,
@@ -1678,10 +1685,7 @@ mod tests {
         // `INSERT … (` column list. (The simple-mode DSL value-slot
         // prose is a separate surface; this pins the §8 advanced claim.)
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Name", Type::Text)]);
 
         let set_slot = "update Customers set ";
         match ambient_hint_in_mode(set_slot, set_slot.len(), None, &cache, Mode::Advanced) {
@@ -1706,16 +1710,10 @@ mod tests {
     fn simple_mode_ambient_does_not_surface_sql_candidates() {
         // The simple-mode entry point keeps gating SQL — advanced
         // assistance is opt-in via mode, never leaked into simple.
-        let cache =
-            schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
+        let cache = schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
         let input = "select * from ";
-        let hint = ambient_hint_in_mode(
-            input,
-            input.len(),
-            None,
-            &cache,
-            crate::mode::Mode::Simple,
-        );
+        let hint =
+            ambient_hint_in_mode(input, input.len(), None, &cache, crate::mode::Mode::Simple);
         let offers_table = matches!(
             &hint,
             Some(AmbientHint::Candidates { items, .. })
@@ -1733,8 +1731,7 @@ mod tests {
     fn f1_mid_typed_table_prefix_shows_completion_not_error() {
         // "select * from c" — `c` prefix-matches `Customers`. The
         // hint must offer the completion, not "no such table c".
-        let cache =
-            schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
+        let cache = schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
         match ambient_hint_in_mode(
             "select * from c",
             "select * from c".len(),
@@ -1753,8 +1750,7 @@ mod tests {
     #[test]
     fn f1_genuinely_unknown_table_still_shows_error() {
         // "zzz" matches no table prefix — the error must still show.
-        let cache =
-            schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
+        let cache = schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
         match ambient_hint_in_mode(
             "select * from zzz",
             "select * from zzz".len(),
@@ -1773,8 +1769,7 @@ mod tests {
     fn f1_simple_mode_dsl_mid_typed_table_completes() {
         // The same shadowing affects DSL commands in simple mode:
         // "show data c" must offer Customers, not "no such table c".
-        let cache =
-            schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
+        let cache = schema_with_columns("Customers", &[("id", crate::dsl::types::Type::Int)]);
         match ambient_hint_in_mode(
             "show data c",
             "show data c".len(),
@@ -1804,7 +1799,12 @@ mod tests {
         cache.columns.push("order_col".to_string());
         cache.table_columns.insert(
             "Orders".to_string(),
-            vec![TableColumn { name: "order_col".to_string(), user_type: Type::Int, not_null: false, has_default: false }],
+            vec![TableColumn {
+                name: "order_col".to_string(),
+                user_type: Type::Int,
+                not_null: false,
+                has_default: false,
+            }],
         );
 
         let comp = crate::completion::candidates_at_cursor_in_mode(
@@ -1846,9 +1846,7 @@ mod tests {
         for c in &columns {
             cache.columns.push(c.name.clone());
         }
-        cache
-            .table_columns
-            .insert(table.to_string(), columns);
+        cache.table_columns.insert(table.to_string(), columns);
         cache
     }
 
@@ -1860,7 +1858,11 @@ mod tests {
             ("Customers", &[("id", Type::Serial), ("name", Type::Text)]),
             (
                 "Products",
-                &[("id", Type::Serial), ("name", Type::Text), ("price", Type::Decimal)],
+                &[
+                    ("id", Type::Serial),
+                    ("name", Type::Text),
+                    ("price", Type::Decimal),
+                ],
             ),
             (
                 "OrderLines",
@@ -1873,13 +1875,19 @@ mod tests {
             ),
             (
                 "Orders",
-                &[("id", Type::Serial), ("customer_id", Type::Int), ("date", Type::Date)],
+                &[
+                    ("id", Type::Serial),
+                    ("customer_id", Type::Int),
+                    ("date", Type::Date),
+                ],
             ),
         ];
         for (t, cols) in tables {
             cache.tables.push((*t).to_string());
-            let tc: Vec<TableColumn> =
-                cols.iter().map(|(n, ty)| TableColumn::new(*n, *ty)).collect();
+            let tc: Vec<TableColumn> = cols
+                .iter()
+                .map(|(n, ty)| TableColumn::new(*n, *ty))
+                .collect();
             for c in &tc {
                 cache.columns.push(c.name.clone());
             }
@@ -1914,17 +1922,11 @@ mod tests {
     #[test]
     fn ambient_hint_at_insert_first_value_shows_int_prose() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Name", Type::Text)]);
         let input = "insert into Customers values (";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
-                assert!(
-                    p.contains("integer"),
-                    "expected int-slot prose, got: {p:?}",
-                );
+                assert!(p.contains("integer"), "expected int-slot prose, got: {p:?}",);
             }
             other => panic!("expected Prose, got {other:?}"),
         }
@@ -1942,7 +1944,11 @@ mod tests {
         use crate::dsl::types::Type;
         let cache = schema_with_columns(
             "Customers",
-            &[("id", Type::Serial), ("Name", Type::Text), ("Email", Type::Text)],
+            &[
+                ("id", Type::Serial),
+                ("Name", Type::Text),
+                ("Email", Type::Text),
+            ],
         );
         let input = "insert into Customers values (1, 'Alice', 'a@b.c')";
         match ambient_hint(input, input.len(), None, &cache) {
@@ -1966,10 +1972,7 @@ mod tests {
         // A valid simple-mode DSL command gets no advanced pointer —
         // it isn't an error, and there is nothing to switch modes for.
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Serial), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Serial), ("Name", Type::Text)]);
         let input = "insert into Customers values ('Alice')";
         if let Some(AmbientHint::Prose(p)) = ambient_hint(input, input.len(), None, &cache) {
             assert!(
@@ -2010,10 +2013,7 @@ mod tests {
     #[test]
     fn ambient_hint_at_insert_second_value_shows_text_prose() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Name", Type::Text)]);
         let input = "insert into Customers values (1, ";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
@@ -2029,10 +2029,8 @@ mod tests {
     #[test]
     fn ambient_hint_at_update_set_shows_per_column_prose() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Birthday", Type::Date)],
-        );
+        let cache =
+            schema_with_columns("Customers", &[("id", Type::Int), ("Birthday", Type::Date)]);
         let input = "update Customers set Birthday=";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
@@ -2057,9 +2055,7 @@ mod tests {
         // hasn't committed), the Optional propagates Incomplete
         // and the user sees no error overlay until they submit.
         assert_eq!(
-            classify_input(
-                "insert into Orders (id, CustId, Total) values (42, 89, 17.59"
-            ),
+            classify_input("insert into Orders (id, CustId, Total) values (42, 89, 17.59"),
             InputState::IncompleteAtEof,
         );
         assert_eq!(
@@ -2071,18 +2067,12 @@ mod tests {
     #[test]
     fn ambient_hint_at_insert_first_value_mentions_column_name() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Name", Type::Text)]);
         let input = "insert into Customers values (";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
                 assert!(p.contains("id"), "expected column name `id`, got {p:?}");
-                assert!(
-                    p.contains("integer"),
-                    "expected int prose, got {p:?}",
-                );
+                assert!(p.contains("integer"), "expected int prose, got {p:?}",);
             }
             other => panic!("expected Prose, got {other:?}"),
         }
@@ -2091,10 +2081,7 @@ mod tests {
     #[test]
     fn ambient_hint_at_update_set_mentions_column_name() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Email", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Email", Type::Text)]);
         let input = "update Customers set Email=";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
@@ -2131,10 +2118,7 @@ mod tests {
     #[test]
     fn ambient_hint_at_second_insert_value_mentions_second_column() {
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("id", Type::Int), ("Name", Type::Text)],
-        );
+        let cache = schema_with_columns("Customers", &[("id", Type::Int), ("Name", Type::Text)]);
         let input = "insert into Customers values (1, ";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
@@ -2165,14 +2149,20 @@ mod tests {
         use crate::dsl::types::Type;
         let cases: &[(&[(&str, Type)], &str)] = &[
             // string first value (the report's case): first col text.
-            (&[("Name", Type::Text), ("Age", Type::Int)],
-             "insert into Customers values ('Oli'"),
+            (
+                &[("Name", Type::Text), ("Age", Type::Int)],
+                "insert into Customers values ('Oli'",
+            ),
             // integer first value: first col int.
-            (&[("Age", Type::Int), ("Name", Type::Text)],
-             "insert into Customers values (42"),
+            (
+                &[("Age", Type::Int), ("Name", Type::Text)],
+                "insert into Customers values (42",
+            ),
             // real first value: first col real.
-            (&[("Score", Type::Real), ("Name", Type::Text)],
-             "insert into Customers values (3.5"),
+            (
+                &[("Score", Type::Real), ("Name", Type::Text)],
+                "insert into Customers values (3.5",
+            ),
         ];
         for (cols, input) in cases {
             let cache = schema_with_columns("Customers", cols);
@@ -2232,10 +2222,7 @@ mod tests {
         // is nothing left to fill. Guards against over-correcting the
         // fix into never suggesting the close paren.
         use crate::dsl::types::Type;
-        let cache = schema_with_columns(
-            "Customers",
-            &[("Name", Type::Text), ("Age", Type::Int)],
-        );
+        let cache = schema_with_columns("Customers", &[("Name", Type::Text), ("Age", Type::Int)]);
         let input = "insert into Customers values ('Oli', 52";
         match ambient_hint(input, input.len(), None, &cache) {
             Some(AmbientHint::Prose(p)) => {
@@ -2384,10 +2371,7 @@ mod tests {
         match ambient_hint("show data Missing", 17, None, &cache) {
             Some(AmbientHint::Prose(p)) => {
                 assert!(p.contains("Missing"), "got {p:?}");
-                assert!(
-                    p.to_lowercase().contains("no such table"),
-                    "got {p:?}",
-                );
+                assert!(p.to_lowercase().contains("no such table"), "got {p:?}",);
             }
             other => panic!("expected Prose, got {other:?}"),
         }
@@ -2440,8 +2424,7 @@ mod tests {
         use crate::dsl::types::Type;
         // Two type-mismatch WARNINGs; the hint names the column
         // whose offending literal the cursor sits in.
-        let cache =
-            schema_with_columns("Events", &[("a", Type::Int), ("b", Type::Int)]);
+        let cache = schema_with_columns("Events", &[("a", Type::Int), ("b", Type::Int)]);
         let input = "delete from Events where a = 'x' or b = 'y'";
         let on_x = input.find("'x'").expect("'x' literal") + 1;
         let on_y = input.find("'y'").expect("'y' literal") + 1;
@@ -2460,8 +2443,16 @@ mod tests {
             inserted_range: (5, 5),
             original_text: String::new(),
             candidates: vec![
-                Candidate { text: "data".to_string(), kind: CandidateKind::Keyword, mode: crate::completion::ModeClass::Both },
-                Candidate { text: "table".to_string(), kind: CandidateKind::Keyword, mode: crate::completion::ModeClass::Both },
+                Candidate {
+                    text: "data".to_string(),
+                    kind: CandidateKind::Keyword,
+                    mode: crate::completion::ModeClass::Both,
+                },
+                Candidate {
+                    text: "table".to_string(),
+                    kind: CandidateKind::Keyword,
+                    mode: crate::completion::ModeClass::Both,
+                },
             ],
             selection_idx: 1,
         };
@@ -2494,8 +2485,16 @@ mod tests {
             // produce — proves the memo's list is being used,
             // not a recomputed one.
             candidates: vec![
-                Candidate { text: "data".to_string(), kind: CandidateKind::Keyword, mode: crate::completion::ModeClass::Both },
-                Candidate { text: "table".to_string(), kind: CandidateKind::Keyword, mode: crate::completion::ModeClass::Both },
+                Candidate {
+                    text: "data".to_string(),
+                    kind: CandidateKind::Keyword,
+                    mode: crate::completion::ModeClass::Both,
+                },
+                Candidate {
+                    text: "table".to_string(),
+                    kind: CandidateKind::Keyword,
+                    mode: crate::completion::ModeClass::Both,
+                },
             ],
             selection_idx: 1,
         };
@@ -2564,10 +2563,7 @@ mod tests {
     fn classify_trailing_whitespace_does_not_create_definite_error() {
         // Trailing whitespace alone shouldn't promote an
         // incomplete-at-EOF state into a definite error.
-        assert_eq!(
-            classify_input("create   "),
-            InputState::IncompleteAtEof,
-        );
+        assert_eq!(classify_input("create   "), InputState::IncompleteAtEof,);
     }
 
     #[test]

src/logging.rs

@@ -60,8 +60,8 @@ pub fn init(path: Option<&Path>) -> Result<PathBuf> {
             .with_context(|| format!("create log directory {}", parent.display()))?;
     }
     let file = open_log_file(&chosen)?;
-    let filter = EnvFilter::try_from_env("RDBMS_PLAYGROUND_LOG")
-        .unwrap_or_else(|_| EnvFilter::new("info"));
+    let filter =
+        EnvFilter::try_from_env("RDBMS_PLAYGROUND_LOG").unwrap_or_else(|_| EnvFilter::new("info"));
     let layer = fmt::layer()
         .with_writer(file)
         .with_ansi(false)
@@ -95,8 +95,7 @@ fn home_dir() -> Option<PathBuf> {
     if let Some(p) = std::env::var_os("HOME") {
         return Some(PathBuf::from(p));
     }
-    if let (Some(drive), Some(path)) =
-        (std::env::var_os("HOMEDRIVE"), std::env::var_os("HOMEPATH"))
+    if let (Some(drive), Some(path)) = (std::env::var_os("HOMEDRIVE"), std::env::var_os("HOMEPATH"))
     {
         let mut combined = PathBuf::from(drive);
         combined.push(path);

src/main.rs

@@ -1,6 +1,6 @@
 use std::process::ExitCode;
 
-use rdbms_playground::cli::{help_text, Args};
+use rdbms_playground::cli::{Args, help_text, version_text};
 use rdbms_playground::{logging, runtime};
 
 fn main() -> ExitCode {
@@ -22,6 +22,11 @@ fn main() -> ExitCode {
         }
     };
 
+    if args.version {
+        println!("{}", version_text());
+        return ExitCode::SUCCESS;
+    }
+
     if args.help {
         print!("{}", help_text());
         return ExitCode::SUCCESS;

src/output_render.rs

@@ -172,7 +172,10 @@ fn constraint_lines(desc: &TableDescription) -> Vec<String> {
 /// A `detail` matching no marker renders neutral — the engine's
 /// plan vocabulary may grow (ADR-0028 §4).
 const PLAN_TAXONOMY: &[(&str, OutputStyleClass)] = &[
-    ("USING AUTOMATIC COVERING INDEX", OutputStyleClass::AutomaticIndex),
+    (
+        "USING AUTOMATIC COVERING INDEX",
+        OutputStyleClass::AutomaticIndex,
+    ),
     ("USING AUTOMATIC INDEX", OutputStyleClass::AutomaticIndex),
     ("USING COVERING INDEX", OutputStyleClass::Efficient),
     ("USING INTEGER PRIMARY KEY", OutputStyleClass::Efficient),
@@ -225,8 +228,7 @@ fn render_plan_subtree(
     emitted: &mut HashSet<i64>,
     mode: Mode,
 ) {
-    let children: Vec<&ExplainRow> =
-        rows.iter().filter(|r| r.parent == parent).collect();
+    let children: Vec<&ExplainRow> = rows.iter().filter(|r| r.parent == parent).collect();
     let last_idx = children.len().saturating_sub(1);
     for (idx, row) in children.iter().enumerate() {
         if !emitted.insert(row.id) {
@@ -235,8 +237,7 @@ fn render_plan_subtree(
         let is_last = idx == last_idx;
         let connector = if is_last { "└─ " } else { "├─ " };
         out.push(plan_node_line(prefix, connector, &row.detail, mode));
-        let child_prefix =
-            format!("{prefix}{}", if is_last { "   " } else { "│  " });
+        let child_prefix = format!("{prefix}{}", if is_last { "   " } else { "│  " });
         render_plan_subtree(rows, row.id, &child_prefix, out, emitted, mode);
     }
 }
@@ -343,13 +344,8 @@ pub fn render_diagnostic_table(
 const fn alignment_for(ty: Option<Type>) -> Alignment {
     match ty {
         Some(Type::Int | Type::Real | Type::Decimal | Type::Serial) => Alignment::Right,
-        Some(Type::Text)
-        | Some(Type::Bool)
-        | Some(Type::Date)
-        | Some(Type::DateTime)
-        | Some(Type::Blob)
-        | Some(Type::ShortId)
-        | None => Alignment::Left,
+        Some(Type::Text) | Some(Type::Bool) | Some(Type::Date) | Some(Type::DateTime)
+        | Some(Type::Blob) | Some(Type::ShortId) | None => Alignment::Left,
     }
 }
 
@@ -406,11 +402,7 @@ fn cell_width(s: &str) -> usize {
 /// Render a single bordered table given header cells, body
 /// rows, and per-column alignment. Outer frame +
 /// header-underline only.
-fn render_table(
-    headers: &[String],
-    body: &[Vec<String>],
-    alignments: &[Alignment],
-) -> Vec<String> {
+fn render_table(headers: &[String], body: &[Vec<String>], alignments: &[Alignment]) -> Vec<String> {
     debug_assert_eq!(headers.len(), alignments.len());
 
     // Compute column widths: max(header, all body cells).
@@ -792,13 +784,12 @@ fn gutter_seg(i: usize, child_rows: &[usize], parent_rows: &[usize], w: usize) -
     }
 
     // The vertical bus spans the full range of endpoint rows.
-    let bounds = child_rows
-        .iter()
-        .chain(parent_rows)
-        .copied()
-        .fold(None, |acc: Option<(usize, usize)>, r| {
+    let bounds = child_rows.iter().chain(parent_rows).copied().fold(
+        None,
+        |acc: Option<(usize, usize)>, r| {
             Some(acc.map_or((r, r), |(lo, hi)| (lo.min(r), hi.max(r))))
-        });
+        },
+    );
     if let Some((top, bot)) = bounds
         && i >= top
         && i <= bot
@@ -1138,7 +1129,10 @@ mod tests {
         assert!(out.contains("customer_id ●"), "FK marker:\n{out}");
         assert!(out.contains("id (PK) ●"), "parent endpoint marker:\n{out}");
         assert!(out.contains('▶'), "arrowhead:\n{out}");
-        assert!(out.contains('n') && out.contains('1'), "cardinality:\n{out}");
+        assert!(
+            out.contains('n') && out.contains('1'),
+            "cardinality:\n{out}"
+        );
         assert!(
             out.contains("on delete cascade · on update no action"),
             "actions:\n{out}"
@@ -1237,7 +1231,10 @@ mod tests {
         let (r_out, r_in) = blank_rels();
         let region = TableDescription {
             name: "Region".to_string(),
-            columns: vec![col("country", Type::Int, true, false), col("code", Type::Int, true, false)],
+            columns: vec![
+                col("country", Type::Int, true, false),
+                col("code", Type::Int, true, false),
+            ],
             outbound_relationships: r_out,
             inbound_relationships: r_in,
             indexes: Vec::new(),
@@ -1277,7 +1274,10 @@ mod tests {
             .collect::<Vec<_>>()
             .join("\n");
         assert!(text.contains("region_code ●"), "child endpoint 2:\n{text}");
-        assert!(text.contains("(PK) ●"), "parent endpoint is PK + marked:\n{text}");
+        assert!(
+            text.contains("(PK) ●"),
+            "parent endpoint is PK + marked:\n{text}"
+        );
         assert!(
             text.contains("(country, region_code) ▶ Region.(country, code)"),
             "pairing line:\n{text}",
@@ -1412,11 +1412,7 @@ mod tests {
         let data = DataResult {
             table_name: "Customers".to_string(),
             columns: vec!["id".to_string(), "Name".to_string(), "Email".to_string()],
-            column_types: vec![
-                Some(Type::Serial),
-                Some(Type::Text),
-                Some(Type::Text),
-            ],
+            column_types: vec![Some(Type::Serial), Some(Type::Text), Some(Type::Text)],
             rows: vec![
                 vec![
                     Some("1".to_string()),
@@ -1634,7 +1630,10 @@ mod tests {
         assert!(out.contains("Indexes:"), "got:\n{out}");
         assert!(out.contains("idx_email (Email)"), "got:\n{out}");
         // A plain index carries no uniqueness marker.
-        assert!(!out.contains("[unique]"), "plain index unmarked; got:\n{out}");
+        assert!(
+            !out.contains("[unique]"),
+            "plain index unmarked; got:\n{out}"
+        );
     }
 
     #[test]
@@ -1677,7 +1676,10 @@ mod tests {
             indexes: Vec::new(),
             unique_constraints: vec![vec!["a".to_string(), "b".to_string()]],
             check_constraints: vec![
-                crate::persistence::TableCheck { name: None, expr: "a < b".to_string() },
+                crate::persistence::TableCheck {
+                    name: None,
+                    expr: "a < b".to_string(),
+                },
                 crate::persistence::TableCheck {
                     name: Some("a_lt_b".to_string()),
                     expr: "a <> b".to_string(),
@@ -1691,7 +1693,10 @@ mod tests {
         // (ADR-0035 Amendment 1) so the user can `drop constraint <name>`.
         assert!(out.contains("unique_a_b: unique (a, b)"), "got:\n{out}");
         assert!(out.contains("check (a < b)"), "unnamed check; got:\n{out}");
-        assert!(out.contains("check a_lt_b (a <> b)"), "named check shows its name; got:\n{out}");
+        assert!(
+            out.contains("check a_lt_b (a <> b)"),
+            "named check shows its name; got:\n{out}"
+        );
     }
 
     #[test]
@@ -1732,17 +1737,37 @@ mod tests {
         let plan = QueryPlan {
             display_sql: "SELECT 1".to_string(),
             rows: vec![
-                ExplainRow { id: 1, parent: 0, detail: "root".to_string() },
-                ExplainRow { id: 2, parent: 1, detail: "child-a".to_string() },
-                ExplainRow { id: 3, parent: 1, detail: "child-b".to_string() },
+                ExplainRow {
+                    id: 1,
+                    parent: 0,
+                    detail: "root".to_string(),
+                },
+                ExplainRow {
+                    id: 2,
+                    parent: 1,
+                    detail: "child-a".to_string(),
+                },
+                ExplainRow {
+                    id: 3,
+                    parent: 1,
+                    detail: "child-b".to_string(),
+                },
             ],
         };
         let lines = render_explain_plan(&plan, Mode::Simple);
         // display SQL + 3 plan nodes.
         assert_eq!(lines.len(), 4);
         assert!(lines[1].text.contains("root"));
-        assert!(lines[2].text.contains("├─ child-a"), "got {:?}", lines[2].text);
-        assert!(lines[3].text.contains("└─ child-b"), "got {:?}", lines[3].text);
+        assert!(
+            lines[2].text.contains("├─ child-a"),
+            "got {:?}",
+            lines[2].text
+        );
+        assert!(
+            lines[3].text.contains("└─ child-b"),
+            "got {:?}",
+            lines[3].text
+        );
         // The single root uses `└─`; its children are indented
         // by three spaces (no `│` spine, the root being last).
         assert!(lines[1].text.starts_with("└─ root"));
@@ -1775,7 +1800,10 @@ mod tests {
     fn render_explain_plan_colours_a_full_scan_expensive() {
         let plan = one_node_plan("SCAN Customers");
         let lines = render_explain_plan(&plan, Mode::Simple);
-        assert_eq!(span_class_for(&lines[1], "SCAN"), OutputStyleClass::Expensive);
+        assert_eq!(
+            span_class_for(&lines[1], "SCAN"),
+            OutputStyleClass::Expensive
+        );
         // The table name stays neutral (ADR-0028 §6).
         assert_eq!(
             span_class_for(&lines[1], "Customers"),
@@ -1801,8 +1829,7 @@ mod tests {
 
     #[test]
     fn render_explain_plan_flags_an_automatic_index() {
-        let plan =
-            one_node_plan("SEARCH Orders USING AUTOMATIC COVERING INDEX (CustId=?)");
+        let plan = one_node_plan("SEARCH Orders USING AUTOMATIC COVERING INDEX (CustId=?)");
         let lines = render_explain_plan(&plan, Mode::Simple);
         assert_eq!(
             span_class_for(&lines[1], "USING AUTOMATIC COVERING INDEX"),

src/persistence/csv_io.rs

@@ -150,7 +150,9 @@ fn encode_cell(ty: Type, value: &CellValue) -> Result<Cell, String> {
             other => Err(format!("expected date/datetime (text), got {other:?}")),
         },
         Type::Blob => match value {
-            CellValue::Blob(bytes) => Ok(Cell::Plain(base64::engine::general_purpose::STANDARD.encode(bytes))),
+            CellValue::Blob(bytes) => Ok(Cell::Plain(
+                base64::engine::general_purpose::STANDARD.encode(bytes),
+            )),
             other => Err(format!("expected blob, got {other:?}")),
         },
         Type::Serial => match value {
@@ -169,7 +171,11 @@ fn format_real(f: f64) -> String {
     if f.is_nan() {
         "nan".to_string()
     } else if f.is_infinite() {
-        if f > 0.0 { "inf".to_string() } else { "-inf".to_string() }
+        if f > 0.0 {
+            "inf".to_string()
+        } else {
+            "-inf".to_string()
+        }
     } else {
         // Default `{}` formatting on f64 emits a shortest
         // round-tripping decimal — exactly what the ADR asks
@@ -318,8 +324,7 @@ fn parse_field(bytes: &[u8]) -> Result<(RawCell, usize), CsvError> {
                 _ => i += 1,
             }
         }
-        let content =
-            String::from_utf8(bytes[..i].to_vec()).map_err(|_| CsvError::InvalidUtf8)?;
+        let content = String::from_utf8(bytes[..i].to_vec()).map_err(|_| CsvError::InvalidUtf8)?;
         Ok((
             RawCell {
                 content,
@@ -435,7 +440,10 @@ mod tests {
             name: "T".to_string(),
             columns: vec![col("n", Type::Int), col("r", Type::Real)],
             rows: vec![
-                vec![CellValue::Integer(42), CellValue::Real(std::f64::consts::PI)],
+                vec![
+                    CellValue::Integer(42),
+                    CellValue::Real(std::f64::consts::PI),
+                ],
                 vec![CellValue::Integer(-7), CellValue::Real(0.0)],
             ],
         })
@@ -452,10 +460,7 @@ mod tests {
         let body = serialize_table(&TableSnapshot {
             name: "T".to_string(),
             columns: vec![col("b", Type::Bool)],
-            rows: vec![
-                vec![CellValue::Integer(1)],
-                vec![CellValue::Integer(0)],
-            ],
+            rows: vec![vec![CellValue::Integer(1)], vec![CellValue::Integer(0)]],
         })
         .unwrap();
         let s = String::from_utf8(body).unwrap();
@@ -555,13 +560,21 @@ mod tests {
         let body = serialize_table(&table).unwrap();
         let parsed = parse_csv(std::str::from_utf8(&body).unwrap()).unwrap();
         let row = &parsed.rows[0];
-        assert!(matches!(decode_cell(Type::Int, &row[0]).unwrap(), CellValue::Integer(42)));
+        assert!(matches!(
+            decode_cell(Type::Int, &row[0]).unwrap(),
+            CellValue::Integer(42)
+        ));
         match decode_cell(Type::Real, &row[1]).unwrap() {
             CellValue::Real(f) => assert!((f - std::f64::consts::PI).abs() < 1e-12),
             other => panic!("got {other:?}"),
         }
-        assert!(matches!(decode_cell(Type::Bool, &row[2]).unwrap(), CellValue::Integer(1)));
-        assert!(matches!(decode_cell(Type::Blob, &row[3]).unwrap(), CellValue::Blob(b) if b == b"hi"));
+        assert!(matches!(
+            decode_cell(Type::Bool, &row[2]).unwrap(),
+            CellValue::Integer(1)
+        ));
+        assert!(
+            matches!(decode_cell(Type::Blob, &row[3]).unwrap(), CellValue::Blob(b) if b == b"hi")
+        );
     }
 
     #[test]
@@ -572,7 +585,10 @@ mod tests {
 
     #[test]
     fn decode_cell_reports_friendly_error_for_bad_int() {
-        let cell = RawCell { content: "abc".to_string(), was_quoted: false };
+        let cell = RawCell {
+            content: "abc".to_string(),
+            was_quoted: false,
+        };
         let err = decode_cell(Type::Int, &cell).expect_err("must error");
         assert!(err.contains("integer"));
         assert!(err.contains("abc"));

src/persistence/history.rs

@@ -108,10 +108,7 @@ pub(super) fn read_recent_sources(
             });
         }
     };
-    let mut sources: Vec<String> = body
-        .lines()
-        .filter_map(parse_record_source)
-        .collect();
+    let mut sources: Vec<String> = body.lines().filter_map(parse_record_source).collect();
     if sources.len() > max_n {
         let skip = sources.len() - max_n;
         sources.drain(0..skip);
@@ -187,12 +184,26 @@ fn looks_like_iso8601(s: &str) -> bool {
         return false;
     }
     let digit = |i: usize| b[i].is_ascii_digit();
-    digit(0) && digit(1) && digit(2) && digit(3) && b[4] == b'-'
-        && digit(5) && digit(6) && b[7] == b'-'
-        && digit(8) && digit(9) && b[10] == b'T'
-        && digit(11) && digit(12) && b[13] == b':'
-        && digit(14) && digit(15) && b[16] == b':'
-        && digit(17) && digit(18) && b[19] == b'Z'
+    digit(0)
+        && digit(1)
+        && digit(2)
+        && digit(3)
+        && b[4] == b'-'
+        && digit(5)
+        && digit(6)
+        && b[7] == b'-'
+        && digit(8)
+        && digit(9)
+        && b[10] == b'T'
+        && digit(11)
+        && digit(12)
+        && b[13] == b':'
+        && digit(14)
+        && digit(15)
+        && b[16] == b':'
+        && digit(17)
+        && digit(18)
+        && b[19] == b'Z'
 }
 
 fn unescape_command(s: &str) -> String {
@@ -321,10 +332,8 @@ mod tests {
 
     #[test]
     fn parse_journal_record_ok_extracts_unescaped_source() {
-        let rec = parse_journal_record(
-            "2026-05-24T10:00:00Z|ok|create table T with pk id(int)",
-        )
-        .expect("valid ok journal record");
+        let rec = parse_journal_record("2026-05-24T10:00:00Z|ok|create table T with pk id(int)")
+            .expect("valid ok journal record");
         assert!(rec.status_is_ok);
         assert_eq!(rec.source, "create table T with pk id(int)");
     }
@@ -370,8 +379,8 @@ mod tests {
     fn parse_journal_record_preserves_pipe_in_source() {
         // `|` is not escaped by the writer (it's a valid SQL char);
         // `splitn(3, '|')` keeps everything after the second `|`.
-        let rec = parse_journal_record("2026-05-24T10:00:00Z|ok|select 'a|b' from t")
-            .expect("ok record");
+        let rec =
+            parse_journal_record("2026-05-24T10:00:00Z|ok|select 'a|b' from t").expect("ok record");
         assert_eq!(rec.source, "select 'a|b' from t");
     }
 
@@ -406,7 +415,10 @@ mod tests {
     #[test]
     fn iso8601_known_seconds() {
         assert_eq!(iso8601_from_unix_secs(0), "1970-01-01T00:00:00Z");
-        assert_eq!(iso8601_from_unix_secs(1_778_112_000), "2026-05-07T00:00:00Z");
+        assert_eq!(
+            iso8601_from_unix_secs(1_778_112_000),
+            "2026-05-07T00:00:00Z"
+        );
     }
 
     #[test]
@@ -437,7 +449,10 @@ mod tests {
             .collect();
         std::fs::write(&path, body).unwrap();
         let got = read_recent_sources(&path, 3).unwrap();
-        assert_eq!(got, vec!["cmd7".to_string(), "cmd8".to_string(), "cmd9".to_string()]);
+        assert_eq!(
+            got,
+            vec!["cmd7".to_string(), "cmd8".to_string(), "cmd9".to_string()]
+        );
     }
 
     #[test]

src/persistence/migrations.rs

@@ -82,7 +82,10 @@ impl Default for MigratorRegistry {
 #[derive(Debug)]
 pub enum MigrateError {
     VersionParse(String),
-    NewerThanSupported { file: u32, latest: u32 },
+    NewerThanSupported {
+        file: u32,
+        latest: u32,
+    },
     NoMigratorForVersion(u32),
     StepFailed {
         from: u32,
@@ -108,10 +111,9 @@ impl std::fmt::Display for MigrateError {
                 file = file,
                 latest = latest,
             )),
-            Self::NoMigratorForVersion(v) => f.write_str(&crate::t!(
-                "persistence.migrate.no_migrator",
-                version = v,
-            )),
+            Self::NoMigratorForVersion(v) => {
+                f.write_str(&crate::t!("persistence.migrate.no_migrator", version = v,))
+            }
             Self::StepFailed { from, to, source } => f.write_str(&crate::t!(
                 "persistence.migrate.step_failed",
                 from = from,
@@ -192,8 +194,11 @@ pub fn migrate_to_latest(
 
     // Write the .bak before any transformation runs so a
     // mid-migration crash leaves the original recoverable.
-    let bak_path =
-        project_path.join(format!("{}.v{}.bak", crate::project::PROJECT_YAML, file_version));
+    let bak_path = project_path.join(format!(
+        "{}.v{}.bak",
+        crate::project::PROJECT_YAML,
+        file_version
+    ));
     std::fs::write(&bak_path, body).map_err(|source| MigrateError::Io {
         path: bak_path.clone(),
         source,
@@ -214,8 +219,8 @@ pub fn migrate_to_latest(
         // Sanity: the new body must declare the next version.
         // If a migrator forgets to bump, we'd loop endlessly
         // through the chain — catch it here.
-        let advertised = read_version(&next_body)
-            .map_err(|e| MigrateError::BadOutput(e.to_string()))?;
+        let advertised =
+            read_version(&next_body).map_err(|e| MigrateError::BadOutput(e.to_string()))?;
         if advertised != v + 1 {
             return Err(MigrateError::BadOutput(format!(
                 "v{v}→v{} migrator left version field at {advertised}",
@@ -281,9 +286,8 @@ fn read_version(body: &str) -> Result<u32, MigrateError> {
     struct VersionOnly {
         version: u32,
     }
-    let v: VersionOnly = serde_norway::from_str(body).map_err(|e| {
-        MigrateError::VersionParse(e.to_string())
-    })?;
+    let v: VersionOnly =
+        serde_norway::from_str(body).map_err(|e| MigrateError::VersionParse(e.to_string()))?;
     Ok(v.version)
 }
 
@@ -309,12 +313,8 @@ mod tests {
     #[test]
     fn no_migration_runs_when_body_already_latest() {
         let tmp = tempdir();
-        let outcome = migrate_to_latest(
-            &v1_body(),
-            &MigratorRegistry::production(),
-            tmp.path(),
-        )
-        .unwrap();
+        let outcome =
+            migrate_to_latest(&v1_body(), &MigratorRegistry::production(), tmp.path()).unwrap();
         assert_eq!(outcome.body, v1_body());
         assert_eq!(outcome.migrated_from, None);
         // No .bak written when nothing migrated.
@@ -328,7 +328,13 @@ mod tests {
         let err = migrate_to_latest(body, &MigratorRegistry::production(), Path::new("/tmp"))
             .expect_err("must reject");
         assert!(
-            matches!(err, MigrateError::NewerThanSupported { file: 99, latest: 1 }),
+            matches!(
+                err,
+                MigrateError::NewerThanSupported {
+                    file: 99,
+                    latest: 1
+                }
+            ),
             "got: {err:?}",
         );
     }
@@ -366,12 +372,7 @@ mod tests {
     #[test]
     fn migrate_runs_chain_and_writes_bak() {
         let tmp = tempdir();
-        let outcome = migrate_to_latest(
-            &v1_body(),
-            &registry_with_v1_to_v2(),
-            tmp.path(),
-        )
-        .unwrap();
+        let outcome = migrate_to_latest(&v1_body(), &registry_with_v1_to_v2(), tmp.path()).unwrap();
         assert_eq!(outcome.migrated_from, Some(1));
         assert!(outcome.body.contains("version: 2"));
         let bak = tmp.path().join("project.yaml.v1.bak");
@@ -396,11 +397,8 @@ mod tests {
         let tmp = tempdir();
         let yaml_path = tmp.path().join("project.yaml");
         std::fs::write(&yaml_path, v1_body()).unwrap();
-        let outcome = ensure_project_yaml_migrated(
-            tmp.path(),
-            &MigratorRegistry::production(),
-        )
-        .unwrap();
+        let outcome =
+            ensure_project_yaml_migrated(tmp.path(), &MigratorRegistry::production()).unwrap();
         assert_eq!(outcome.migrated_from, None);
         // File unchanged.
         let on_disk = std::fs::read_to_string(&yaml_path).unwrap();
@@ -413,36 +411,32 @@ mod tests {
         let tmp = tempdir();
         let yaml_path = tmp.path().join("project.yaml");
         std::fs::write(&yaml_path, v1_body()).unwrap();
-        let outcome = ensure_project_yaml_migrated(
-            tmp.path(),
-            &registry_with_v1_to_v2(),
-        )
-        .unwrap();
+        let outcome = ensure_project_yaml_migrated(tmp.path(), &registry_with_v1_to_v2()).unwrap();
         assert_eq!(outcome.migrated_from, Some(1));
         let on_disk = std::fs::read_to_string(&yaml_path).unwrap();
         assert!(on_disk.contains("version: 2"), "got: {on_disk}");
         let bak = tmp.path().join("project.yaml.v1.bak");
         assert!(bak.exists());
-        assert!(std::fs::read_to_string(&bak).unwrap().contains("version: 1"));
+        assert!(
+            std::fs::read_to_string(&bak)
+                .unwrap()
+                .contains("version: 1")
+        );
     }
 
     #[test]
     fn ensure_yaml_migrated_handles_missing_yaml() {
         let tmp = tempdir();
         // No project.yaml exists.
-        let outcome = ensure_project_yaml_migrated(
-            tmp.path(),
-            &MigratorRegistry::production(),
-        )
-        .unwrap();
+        let outcome =
+            ensure_project_yaml_migrated(tmp.path(), &MigratorRegistry::production()).unwrap();
         assert_eq!(outcome.migrated_from, None);
         assert!(outcome.body.is_empty());
     }
 
     #[test]
     fn migrator_that_returns_internal_error_propagates() {
-        let bad: MigrateFn =
-            |_| Err(MigrateError::VersionParse("simulated".to_string()));
+        let bad: MigrateFn = |_| Err(MigrateError::VersionParse("simulated".to_string()));
         let registry = MigratorRegistry {
             migrators: vec![bad],
         };

src/persistence/mod.rs

@@ -368,12 +368,11 @@ impl Persistence {
             path: data_dir.clone(),
             source,
         })?;
-        let body =
-            csv_io::serialize_table(table).map_err(|message| PersistenceError::Encode {
-                kind: "CSV",
-                path: data_dir.join(format!("{}.csv", table.name)),
-                message,
-            })?;
+        let body = csv_io::serialize_table(table).map_err(|message| PersistenceError::Encode {
+            kind: "CSV",
+            path: data_dir.join(format!("{}.csv", table.name)),
+            message,
+        })?;
         atomic_write(&data_dir.join(format!("{}.csv", table.name)), &body)
     }
 
@@ -406,11 +405,8 @@ impl Persistence {
     ) -> Result<(), PersistenceError> {
         let path = self.project_path.join(HISTORY_LOG);
         let status = history::status_token(history::STATUS_OK, advanced);
-        let line = history::format_record_with_status(
-            command_text,
-            history::utc_iso8601_now(),
-            &status,
-        );
+        let line =
+            history::format_record_with_status(command_text, history::utc_iso8601_now(), &status);
         debug!(
             len = command_text.len(),
             advanced, "persist: append ok record to history.log"
@@ -432,11 +428,8 @@ impl Persistence {
     ) -> Result<(), PersistenceError> {
         let path = self.project_path.join(HISTORY_LOG);
         let status = history::status_token(history::STATUS_ERR, advanced);
-        let line = history::format_record_with_status(
-            command_text,
-            history::utc_iso8601_now(),
-            &status,
-        );
+        let line =
+            history::format_record_with_status(command_text, history::utc_iso8601_now(), &status);
         debug!(
             len = command_text.len(),
             advanced, "persist: append err record to history.log"
@@ -531,8 +524,14 @@ mod tests {
 
     #[test]
     fn extension_with_tmp_appends_to_existing_extension() {
-        assert_eq!(extension_with_tmp(Path::new("a/b/project.yaml")), "yaml.tmp");
-        assert_eq!(extension_with_tmp(Path::new("a/b/Customers.csv")), "csv.tmp");
+        assert_eq!(
+            extension_with_tmp(Path::new("a/b/project.yaml")),
+            "yaml.tmp"
+        );
+        assert_eq!(
+            extension_with_tmp(Path::new("a/b/Customers.csv")),
+            "csv.tmp"
+        );
         assert_eq!(extension_with_tmp(Path::new("a/b/lockfile")), "tmp");
     }
 
@@ -600,7 +599,8 @@ mod tests {
     fn append_history_creates_and_appends() {
         let dir = tempdir();
         let p = Persistence::new(dir.path().to_path_buf());
-        p.append_history("create table Foo with pk id(serial)", false).unwrap();
+        p.append_history("create table Foo with pk id(serial)", false)
+            .unwrap();
         p.append_history("insert into Foo (1)", false).unwrap();
         let body = fs::read_to_string(dir.path().join(HISTORY_LOG)).unwrap();
         let lines: Vec<&str> = body.trim_end().lines().collect();

src/persistence/yaml.rs

@@ -261,7 +261,10 @@ fn needs_quoting(s: &str) -> bool {
     }
     // Scalar text that looks like a YAML keyword needs quoting
     // even if every character is safe.
-    if matches!(s, "true" | "false" | "null" | "~" | "yes" | "no" | "on" | "off") {
+    if matches!(
+        s,
+        "true" | "false" | "null" | "~" | "yes" | "no" | "on" | "off"
+    ) {
         return true;
     }
     s.chars().any(|c| !is_safe_yaml_char(c))
@@ -287,13 +290,14 @@ pub(crate) fn parse_schema(body: &str) -> Result<SchemaSnapshot, YamlError> {
     for t in raw.tables {
         let mut columns: Vec<ColumnSchema> = Vec::with_capacity(t.columns.len());
         for c in t.columns {
-            let user_type = c.user_type.parse::<Type>().map_err(|_| {
-                YamlError::UnknownType {
+            let user_type = c
+                .user_type
+                .parse::<Type>()
+                .map_err(|_| YamlError::UnknownType {
                     table: t.name.clone(),
                     column: c.name.clone(),
                     raw: c.user_type.clone(),
-                }
-            })?;
+                })?;
             columns.push(ColumnSchema {
                 name: c.name,
                 user_type,
@@ -308,7 +312,11 @@ pub(crate) fn parse_schema(body: &str) -> Result<SchemaSnapshot, YamlError> {
             primary_key: t.primary_key,
             columns,
             unique_constraints: t.unique_constraints,
-            check_constraints: t.check_constraints.into_iter().map(TableCheck::from).collect(),
+            check_constraints: t
+                .check_constraints
+                .into_iter()
+                .map(TableCheck::from)
+                .collect(),
         });
     }
     let mut relationships: Vec<RelationshipSchema> = Vec::with_capacity(raw.relationships.len());
@@ -381,10 +389,7 @@ pub(crate) enum YamlError {
 impl std::fmt::Display for YamlError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::Syntax(msg) => f.write_str(&crate::t!(
-                "persistence.yaml.syntax",
-                detail = msg,
-            )),
+            Self::Syntax(msg) => f.write_str(&crate::t!("persistence.yaml.syntax", detail = msg,)),
             Self::UnsupportedVersion(v) => f.write_str(&crate::t!(
                 "persistence.yaml.unsupported_version",
                 version = v,
@@ -395,10 +400,9 @@ impl std::fmt::Display for YamlError {
                 column = column,
                 raw = raw,
             )),
-            Self::UnknownAction(raw) => f.write_str(&crate::t!(
-                "persistence.yaml.unknown_action",
-                raw = raw,
-            )),
+            Self::UnknownAction(raw) => {
+                f.write_str(&crate::t!("persistence.yaml.unknown_action", raw = raw,))
+            }
         }
     }
 }
@@ -545,8 +549,22 @@ mod tests {
                     name: "Customers".to_string(),
                     primary_key: vec!["id".to_string()],
                     columns: vec![
-                        ColumnSchema { name: "id".to_string(), user_type: Type::Serial, unique: false, not_null: false, default: None, check: None },
-                        ColumnSchema { name: "Name".to_string(), user_type: Type::Text, unique: false, not_null: false, default: None, check: None },
+                        ColumnSchema {
+                            name: "id".to_string(),
+                            user_type: Type::Serial,
+                            unique: false,
+                            not_null: false,
+                            default: None,
+                            check: None,
+                        },
+                        ColumnSchema {
+                            name: "Name".to_string(),
+                            user_type: Type::Text,
+                            unique: false,
+                            not_null: false,
+                            default: None,
+                            check: None,
+                        },
                     ],
                     unique_constraints: Vec::new(),
                     check_constraints: Vec::new(),
@@ -555,8 +573,22 @@ mod tests {
                     name: "Orders".to_string(),
                     primary_key: vec!["id".to_string()],
                     columns: vec![
-                        ColumnSchema { name: "id".to_string(), user_type: Type::Serial, unique: false, not_null: false, default: None, check: None },
-                        ColumnSchema { name: "CustId".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
+                        ColumnSchema {
+                            name: "id".to_string(),
+                            user_type: Type::Serial,
+                            unique: false,
+                            not_null: false,
+                            default: None,
+                            check: None,
+                        },
+                        ColumnSchema {
+                            name: "CustId".to_string(),
+                            user_type: Type::Int,
+                            unique: false,
+                            not_null: false,
+                            default: None,
+                            check: None,
+                        },
                     ],
                     unique_constraints: Vec::new(),
                     check_constraints: Vec::new(),
@@ -798,15 +830,33 @@ indexes:
                 name: "T".to_string(),
                 primary_key: vec![],
                 columns: vec![
-                    ColumnSchema { name: "a".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
-                    ColumnSchema { name: "b".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
-                    ColumnSchema { name: "c".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
+                    ColumnSchema {
+                        name: "a".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
+                    ColumnSchema {
+                        name: "b".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
+                    ColumnSchema {
+                        name: "c".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
                 ],
                 unique_constraints: vec![vec!["a".to_string(), "b".to_string()]],
-                check_constraints: vec![
-                    TableCheck::unnamed("a < b"),
-                    TableCheck::unnamed("b < c"),
-                ],
+                check_constraints: vec![TableCheck::unnamed("a < b"), TableCheck::unnamed("b < c")],
             }],
             relationships: vec![],
             indexes: vec![],
@@ -830,12 +880,29 @@ indexes:
                 name: "T".to_string(),
                 primary_key: vec!["id".to_string()],
                 columns: vec![
-                    ColumnSchema { name: "id".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
-                    ColumnSchema { name: "qty".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
+                    ColumnSchema {
+                        name: "id".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
+                    ColumnSchema {
+                        name: "qty".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
                 ],
                 unique_constraints: vec![],
                 check_constraints: vec![
-                    TableCheck { name: Some("qty_positive".to_string()), expr: "qty >= 0".to_string() },
+                    TableCheck {
+                        name: Some("qty_positive".to_string()),
+                        expr: "qty >= 0".to_string(),
+                    },
                     TableCheck::unnamed("qty < 1000"),
                 ],
             }],
@@ -844,7 +911,10 @@ indexes:
         };
         let body = serialize_schema(&snap);
         let parsed = parse_schema(&body).expect("parse schema");
-        assert_eq!(parsed, snap, "named + unnamed table-CHECKs survive the yaml round-trip");
+        assert_eq!(
+            parsed, snap,
+            "named + unnamed table-CHECKs survive the yaml round-trip"
+        );
     }
 
     #[test]
@@ -968,8 +1038,22 @@ relationships:
                 name: "Items".to_string(),
                 primary_key: vec!["a".to_string(), "b".to_string()],
                 columns: vec![
-                    ColumnSchema { name: "a".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
-                    ColumnSchema { name: "b".to_string(), user_type: Type::Int, unique: false, not_null: false, default: None, check: None },
+                    ColumnSchema {
+                        name: "a".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
+                    ColumnSchema {
+                        name: "b".to_string(),
+                        user_type: Type::Int,
+                        unique: false,
+                        not_null: false,
+                        default: None,
+                        check: None,
+                    },
                 ],
                 unique_constraints: Vec::new(),
                 check_constraints: Vec::new(),
@@ -1019,12 +1103,10 @@ relationships:
         let absent = "version: 1\nproject:\n  created_at: x\ntables: []\n";
         assert_eq!(parse_stored_mode(absent), None);
 
-        let explicit_simple =
-            "version: 1\nproject:\n  created_at: x\n  mode: simple\ntables: []\n";
+        let explicit_simple = "version: 1\nproject:\n  created_at: x\n  mode: simple\ntables: []\n";
         assert_eq!(parse_stored_mode(explicit_simple), Some(Mode::Simple));
 
-        let advanced =
-            "version: 1\nproject:\n  created_at: x\n  mode: advanced\ntables: []\n";
+        let advanced = "version: 1\nproject:\n  created_at: x\n  mode: advanced\ntables: []\n";
         assert_eq!(parse_stored_mode(advanced), Some(Mode::Advanced));
     }
 

src/project/lock.rs

@@ -170,7 +170,10 @@ fn local_hostname() -> String {
 /// Uses `sysinfo` to query the OS process table.
 fn pid_is_alive(pid: u32) -> bool {
     let mut sys = System::new();
-    sys.refresh_processes(sysinfo::ProcessesToUpdate::Some(&[Pid::from_u32(pid)]), true);
+    sys.refresh_processes(
+        sysinfo::ProcessesToUpdate::Some(&[Pid::from_u32(pid)]),
+        true,
+    );
     sys.process(Pid::from_u32(pid)).is_some()
 }
 
@@ -211,7 +214,10 @@ mod tests {
         // The first lock writes our own PID; a second attempt
         // should refuse because the PID is alive on this host.
         let err = Lock::acquire(dir.path()).expect_err("should refuse second acquisition");
-        assert!(matches!(err, LockError::AlreadyHeld { .. }), "unexpected: {err:?}");
+        assert!(
+            matches!(err, LockError::AlreadyHeld { .. }),
+            "unexpected: {err:?}"
+        );
     }
 
     #[test]

src/project/mod.rs

@@ -78,10 +78,7 @@ pub fn read_last_project(data_root: &Path) -> std::io::Result<Option<PathBuf>> {
 /// a moved/deleted directory is the kind of error `--resume`
 /// is supposed to surface clearly, not paper over by
 /// resolving symlinks at write time.
-pub fn write_last_project(
-    data_root: &Path,
-    project_path: &Path,
-) -> std::io::Result<()> {
+pub fn write_last_project(data_root: &Path, project_path: &Path) -> std::io::Result<()> {
     fs::create_dir_all(data_root)?;
     let final_path = data_root.join(LAST_PROJECT_FILE);
     let tmp_path = data_root.join(format!("{LAST_PROJECT_FILE}.tmp"));
@@ -108,9 +105,8 @@ pub fn resolve_data_root(override_dir: Option<&Path>) -> Result<PathBuf, Project
     if let Some(p) = override_dir {
         return Ok(p.to_path_buf());
     }
-    let dirs = ProjectDirs::from("", "", "rdbms-playground").ok_or(
-        ProjectError::DataRootUnavailable,
-    )?;
+    let dirs =
+        ProjectDirs::from("", "", "rdbms-playground").ok_or(ProjectError::DataRootUnavailable)?;
     Ok(dirs.data_dir().to_path_buf())
 }
 
@@ -255,21 +251,16 @@ pub enum ProjectError {
 impl std::fmt::Display for ProjectError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::DataRootUnavailable => {
-                f.write_str(&crate::t!("project.data_root_unavailable"))
+            Self::DataRootUnavailable => f.write_str(&crate::t!("project.data_root_unavailable")),
+            Self::PathNotFound(p) => {
+                f.write_str(&crate::t!("project.path_not_found", path = p.display(),))
+            }
+            Self::NotAProject(p) => {
+                f.write_str(&crate::t!("project.not_a_project", path = p.display(),))
+            }
+            Self::AlreadyExists(p) => {
+                f.write_str(&crate::t!("project.already_exists", path = p.display(),))
             }
-            Self::PathNotFound(p) => f.write_str(&crate::t!(
-                "project.path_not_found",
-                path = p.display(),
-            )),
-            Self::NotAProject(p) => f.write_str(&crate::t!(
-                "project.not_a_project",
-                path = p.display(),
-            )),
-            Self::AlreadyExists(p) => f.write_str(&crate::t!(
-                "project.already_exists",
-                path = p.display(),
-            )),
             Self::Io { path, source } => f.write_str(&crate::t!(
                 "project.io",
                 path = path.display(),
@@ -609,11 +600,10 @@ pub fn safely_delete_temp_project(
     // 2. Canonicalize for the containment check. We do this
     //    only after the symlink-at-top check so we can't be
     //    tricked by a top-level symlink.
-    let project_canon =
-        fs::canonicalize(project_path).map_err(|source| SafeDeleteError::Io {
-            path: project_path.to_path_buf(),
-            source,
-        })?;
+    let project_canon = fs::canonicalize(project_path).map_err(|source| SafeDeleteError::Io {
+        path: project_path.to_path_buf(),
+        source,
+    })?;
 
     // 3. Containment: canonical path must be inside the
     //    canonical data-root projects dir.
@@ -848,7 +838,10 @@ mod tests {
         assert!(gi.contains("/playground.db"));
         assert!(gi.contains("/.rdbms-playground.lock"));
         assert!(gi.contains("/.snapshots/"), "undo ring should be ignored");
-        assert!(!gi.contains("history.log"), "history.log should NOT be ignored");
+        assert!(
+            !gi.contains("history.log"),
+            "history.log should NOT be ignored"
+        );
     }
 
     #[test]
@@ -890,7 +883,10 @@ mod tests {
         let target = tmp.path().join("MyProject");
         fs::create_dir(&target).unwrap();
         let err = Project::create_named(&target).expect_err("must refuse");
-        assert!(matches!(err, ProjectError::AlreadyExists(_)), "got: {err:?}");
+        assert!(
+            matches!(err, ProjectError::AlreadyExists(_)),
+            "got: {err:?}"
+        );
     }
 
     #[test]
@@ -962,7 +958,10 @@ mod tests {
         )
         .unwrap();
         let read_back = read_last_project(tmp.path()).unwrap();
-        assert_eq!(read_back, Some(std::path::PathBuf::from("/tmp/some/project")));
+        assert_eq!(
+            read_back,
+            Some(std::path::PathBuf::from("/tmp/some/project"))
+        );
     }
 
     #[test]

src/project/naming.rs

@@ -17,8 +17,8 @@
 
 use std::path::Path;
 
-use rand::seq::IndexedRandom;
 use rand::Rng;
+use rand::seq::IndexedRandom;
 
 const WORDLIST: &str = include_str!("wordlist.txt");
 const MAX_COLLISION_RETRIES: usize = 100;
@@ -41,10 +41,9 @@ pub enum NamingError {
 impl std::fmt::Display for NamingError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::WordlistTooSmall(n) => f.write_str(&crate::t!(
-                "project.naming.wordlist_too_small",
-                count = n,
-            )),
+            Self::WordlistTooSmall(n) => {
+                f.write_str(&crate::t!("project.naming.wordlist_too_small", count = n,))
+            }
             Self::TooManyCollisions(n) => f.write_str(&crate::t!(
                 "project.naming.too_many_collisions",
                 attempts = n,
@@ -189,10 +188,9 @@ impl std::fmt::Display for UserNameError {
         match self {
             Self::Empty => f.write_str(&crate::t!("project.user_name.empty")),
             Self::LeadingDot => f.write_str(&crate::t!("project.user_name.leading_dot")),
-            Self::InvalidChar(c) => f.write_str(&crate::t!(
-                "project.user_name.invalid_char",
-                ch = c,
-            )),
+            Self::InvalidChar(c) => {
+                f.write_str(&crate::t!("project.user_name.invalid_char", ch = c,))
+            }
         }
     }
 }
@@ -209,14 +207,22 @@ mod tests {
     #[test]
     fn wordlist_has_enough_entries() {
         let pool = words();
-        assert!(pool.len() >= 100, "wordlist suspiciously small: {} entries", pool.len());
+        assert!(
+            pool.len() >= 100,
+            "wordlist suspiciously small: {} entries",
+            pool.len()
+        );
     }
 
     #[test]
     fn wordlist_has_no_duplicates() {
         let pool = words();
         let unique: std::collections::HashSet<_> = pool.iter().collect();
-        assert_eq!(unique.len(), pool.len(), "wordlist contains duplicate entries");
+        assert_eq!(
+            unique.len(),
+            pool.len(),
+            "wordlist contains duplicate entries"
+        );
     }
 
     #[test]
@@ -290,7 +296,7 @@ mod tests {
         assert!(!is_temp_dirname("MyOrders"));
         assert!(!is_temp_dirname("term_planner"));
         assert!(!is_temp_dirname("20260507-water-buffalo-skating")); // no marker
-        assert!(!is_temp_dirname("temp-project"));                   // no brackets
+        assert!(!is_temp_dirname("temp-project")); // no brackets
     }
 
     #[test]
@@ -301,9 +307,18 @@ mod tests {
         assert!(validate_user_name("project.v2").is_ok());
 
         assert_eq!(validate_user_name(""), Err(UserNameError::Empty));
-        assert_eq!(validate_user_name(".hidden"), Err(UserNameError::LeadingDot));
-        assert!(matches!(validate_user_name("a/b"), Err(UserNameError::InvalidChar('/'))));
-        assert!(matches!(validate_user_name("a b"), Err(UserNameError::InvalidChar(' '))));
+        assert_eq!(
+            validate_user_name(".hidden"),
+            Err(UserNameError::LeadingDot)
+        );
+        assert!(matches!(
+            validate_user_name("a/b"),
+            Err(UserNameError::InvalidChar('/'))
+        ));
+        assert!(matches!(
+            validate_user_name("a b"),
+            Err(UserNameError::InvalidChar(' '))
+        ));
     }
 
     fn tempdir() -> tempfile::TempDir {

src/project/prettifier.rs

@@ -129,7 +129,10 @@ mod tests {
 
     #[test]
     fn strips_date_prefix_from_temp_project_names() {
-        assert_eq!(prettify("20260507-water-buffalo-skating"), "Water Buffalo Skating");
+        assert_eq!(
+            prettify("20260507-water-buffalo-skating"),
+            "Water Buffalo Skating"
+        );
     }
 
     #[test]
@@ -205,6 +208,9 @@ mod tests {
 
     #[test]
     fn handles_mixed_separators_and_case() {
-        assert_eq!(prettify("MyTeam_lessonPlan-2026"), "My Team Lesson Plan 2026");
+        assert_eq!(
+            prettify("MyTeam_lessonPlan-2026"),
+            "My Team Lesson Plan 2026"
+        );
     }
 }