feat(install): curl|sh installer script (ADR-0055)

scripts/install.sh — POSIX sh, shellcheck-clean: detects uname OS/arch ->
target triple (Linux uses the static musl build; Windows rejected with a
Scoop/winget pointer), resolves the latest release (or RDBMS_VERSION),
downloads the asset + its .sha256 and verifies it, installs to
~/.local/bin with a PATH hint. RDBMS_OS/RDBMS_ARCH + --print-target are
testing seams. Verified end-to-end against the live public v0.1.0 (all
mappings, pinned + latest, checksum incl. tamper-rejection, install+run).

ADR-0055 + README index; plan-doc step 2 done + decisions recorded
(crates.io=yes, releases public, tracking via doc+ADR).

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

@@ -0,0 +1,75 @@
+# 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.
+- **`install.ps1` (Windows):** deferred — Windows users go via Scoop /
+  winget (D3, §3). 
+- **Uploading `install.sh` as a release asset** for a stable link:
+  optional; the branch raw URL is fine for now.
+
+## 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/README.md

@@ -67,3 +67,4 @@ This directory contains the project's ADRs, recorded per
 - [ADR-0052 — Mode-tagged history for cross-mode recall](0052-mode-tagged-history-cross-mode-recall.md) — **Accepted + implemented 2026-06-13 (issue #30)**, closes Gitea **#30** — the feature (advanced history reusable in simple mode) **and** the bug in its comment (the `:` one-shot prefix lost across sessions). **Amends ADR-0034** (status field gains a `:adv` tag; **journaling moves from the worker to the dispatch layer**), **ADR-0015 §5/§6** (history.log leaves the worker transaction — `commit-db-last` now scopes yaml/csv/db only), and **ADR-0040** (a success-path journal-write failure is best-effort, not fatal); references ADR-0003. **Root cause:** history carried no mode, and the in-memory ring stored the raw `:select 1` while the worker journalled the *stripped* `select 1`, so the `:` was lost on disk. **Fix:** record the submission mode per entry as a **`:adv` suffix on the status token** (`ok`/`ok:adv`/`err`/`err:adv`) — `source` stays last + canonical so replay is unaffected; the in-memory ring (still `Vec<String>`) stores advanced entries in their `: `-prefixed simple-mode runnable form (a leading `:` unambiguously marks advanced since simple DSL never starts with `:`); recall **strips the `:` in advanced mode** (runs as bare SQL) and keeps it in simple mode (runs via the one-shot escape); hydration reconstructs the `: `-prefix from the tag, so cross-session = in-session. **The architectural turn (user's call):** the first draft kept journaling in the worker + threaded the mode down (~30-site plumbing); on review the user asked why the journal is written deep in the worker when the *failure* path already journals at the top of the chain — it shouldn't (history.log is a journal, not state). So **success journaling moved up** to `spawn_dsl_dispatch` / `run_replay` / the app-command sites (next to the failure path), the worker's `finalize_persistence` now writes only yaml/csv, and the journal write became **best-effort** (the command is already committed — consistent with the failure path; a rare disk-full leaves a committed command unjournalled, state intact). **App commands** journal simple (dispatched outside the spawn) and `submit` excludes them from the ring's advanced flag, so `undo`/`mode advanced` recall bare. Forks user-chosen: status-tag format (vs 4th field / `:`-in-source); unified scope; **dispatch-layer best-effort journaling** (vs worker-coupled-fatal). Two `/runda` passes (the second drove the relocation + app-command exclusion). Tests: the 15 worker-level journaling tests retired (worker no longer journals — yaml/csv/operation checks kept), re-covered at the new layer (history.rs status-tag + `:`-reconstruct; app.rs recall matrix; the #30 cross-session regression in `iteration6`; replay tests cover `run_replay` journaling). **2471 pass / 0 fail / 0 skip (1 ignored), clippy clean.** replay re-journaling mode-fidelity (a replayed advanced line re-journals simple — not a regression). **Follow-up done 2026-06-14:** the vestigial worker `source` plumbing was fully unwound (compiler-guided, no behaviour change) — `_source` removed from `finalize_persistence`/`do_rebuild_from_text`, the three `*_request` wrappers inlined+deleted, the dead `source` param dropped from the ~30 forwarding worker handlers, and the `source` field removed from the `DescribeTable`/`QueryData`/`RunSelect` requests + their `DatabaseHandle` methods (~164 mostly-test call sites); the only worker `source` left is the snapshot/undo label (see ADR-0052 *Consequences*)
 - [ADR-0053 — Contextual `hint` command and keybinding](0053-contextual-hint-command-and-keybinding.md) — **Accepted, implemented 2026-06-15** (Phases A–D; closes **A1** + requirements **H2**). Settles the `hint` slot ADR-0003 left "ADR pending"; closes the last open piece of **A1** and tracks requirements **H2**. **Two surfaces:** an **F1 keybinding** that renders a deep hint for the *live* partial input without submitting (the primary path — a submitted `hint` command can't see the buffer it would help with, since Enter empties it), and a submitted **`hint` command** that expands on the *most recent error*. **No topic argument** (contextual only — `help <topic>` already owns explicit reference). Introduces a **tier-3 teaching layer**, deeper than the existing tier-1 (colour / error headline) and tier-2 (ambient one-liner; and the error `hint:`, which is shown **by default** since `Verbosity::Verbose` is the default — `messages short` is the opt-*out*); without it `hint` would just duplicate what's already on screen. Tier-3 content lives in the catalogue under `hint.cmd.<hint_id>` (per command form) and `hint.err.<class>` (per error/diagnostic class), each a structured `what`/`example`/`concept` block rendered via a new `note_hint*` family with `OutputStyleClass::Hint`. **Keyed per-form via a new `hint_ids: &[&str]` field on `CommandNode` mirroring `usage_ids`** (revised in Phase B): a per-*node* key proved too coarse — `add`/`drop`/`show`/`create` are each one node spanning many forms, and a live-input hint for `add 1:n relationship` must be specific to relationships; `hint_key_for_input_in_mode` reuses `usage_key_for_input_in_mode`'s form-word disambiguation, and covers the advanced-SQL forms whose `usage_ids` are empty. Not keyed off `help_id` (it is `None` on the advanced-SQL nodes purely to dedup the `help` list; that parallel gap is issue **#36**). **Clause-concept hints** (`on delete` actions, constraint slots, `with pk`, cardinality) are a recorded **deferred extension** (`hint.concept.<topic>`, issue **#37**) — per-form is the right tier-3 granularity, with position-awareness owned by tier-2 + the live `Next:` line. Runtime `translate_error` classes resolve via stored `last_error_hint_key` (`hint` command / empty-F1). (The second route — pre-submit `diagnostic.*` read live from the walker on the F1 path — is **deferred**, issue **#38**: `Diagnostic` carries no class key.) Adds `AppCommand::Hint`, a `HINT` grammar node + REGISTRY entry, the `hint_ids` field, and `last_error_hint_key`; F1 is a read-only overlay (buffer + completion memo untouched). **Content is the bulk of the work** (the mechanism is ~a day): v1 scope = ~37 command forms + 9 runtime error classes (comprehensive for those, ~57 blocks), authored **exemplars-first** (voice approved in this ADR's `/runda` review, then mass-authored in batches), enforced by a **comprehensiveness coverage test**, with graceful fall-back to tier-2 if a key is ever missing. The **pre-submit-diagnostic route + ~33 `diagnostic.*` blocks were deferred** (issue **#38**) — `Diagnostic` carries no class key, so the route needs a broad change for marginal value (tier-2 already surfaces diagnostics; many duplicate runtime classes). Forks user-chosen: two-surface model; **F1** (vs `?` / a chord); no-arg; comprehensive-for-commands-and-errors scope; exemplars-first; diagnostics deferred. OOS: per-topic `hint <topic>` (rejected — overlaps `help`); always-on tier-3 (rejected — keeps ambient terse); non-`en-US` locales + success-command teaching (deferred); clause-concept hints (issue #37); the diagnostic route (issue #38); the `help`-side advanced-SQL gap (issue #36)
 - [ADR-0054 — Release versioning policy + version surfaces (`--version` / `version`)](0054-release-versioning-and-version-surfaces.md) — **Accepted + implemented 2026-06-16** (plan: `docs/plans/20260616-public-availability.md`, step 1 on the road to public availability; no prior issue/`requirements.md` item — an untracked gap). Fixes the **tag↔crate-version decoupling**: `Cargo.toml` built `0.1.0` while `release.yaml` named assets from the git tag, so a binary could report a version different from the asset it shipped in. **Decision:** `Cargo.toml` `version` is the **single source of truth** (read via `env!("CARGO_PKG_VERSION")`, no tag-injection); two surfaces report it through one `cli::version_text()` → catalog `cli.version_line` — a **`--version` / `-V`** CLI flag (mirrors `--help`, prints+exits in `main.rs`) and an in-app **`version`** command (REGISTRY node `app::VERSION`, `AppCommand::Version`, emits via `note_system`); and a **release-CI version guard** (`release.yaml` `test` job parses `cargo metadata` and **fails the release** unless the `v*` tag equals `v<CARGO_PKG_VERSION>`). Release ritual: bump `Cargo.toml` → commit → tag → push. New keys `cli.version_line` + `help.app.version` + `parse.usage.version` + `hint.cmd.version.{what,example}` (the new REGISTRY command pulls in the comprehensiveness coverage gate). Rejected: tag-as-source (makes Cargo.toml lie). Deferred: git-hash/build-date enrichment (behind the same `version_text()` seam); UI placement beyond the command. Tested test-first: CLI parse (`--version`/`-V`/default-off), `version_text()` carries `CARGO_PKG_VERSION`, the in-app command parses + emits. Also corrected a stale `release.yaml` header comment ("macOS is deferred" → built by the dispatched `release-macos.yaml`).
+- [ADR-0055 — `curl | sh` install script (`scripts/install.sh`)](0055-curl-sh-install-script.md) — **Accepted + implemented 2026-06-17** (plan: `docs/plans/20260616-public-availability.md`, step 2; tracked by plan + ADR, no Gitea issue — user decision). A one-line installer (`curl -fsSL <gitea-raw>/scripts/install.sh | sh`) so beginners don't hand-pick an asset + `chmod +x`. **POSIX `sh`** (shellcheck-clean), detects `uname` OS/arch → target triple (**Linux → the fully-static `*-musl`** build, macOS → `*-apple-darwin`; `amd64`/`arm64` aliased; **Windows rejected** → Scoop/winget/releases page), resolves the version from the **`releases/latest`** API (or `RDBMS_VERSION` to pin), downloads the asset **and its `.sha256` and verifies it** (mismatch aborts), installs to `~/.local/bin` (`RDBMS_INSTALL_DIR` override) with a PATH hint. Testing seams: `RDBMS_OS`/`RDBMS_ARCH` + `--print-target`. macOS note: `curl` downloads aren't Gatekeeper-quarantined so the ad-hoc binary runs as-is (Developer-ID + notarization is the postponed signing task). **Verified end-to-end against the live public `v0.1.0`** (all platform mappings, pinned + latest, checksum incl. tamper-rejection, install + run). Rejected: website-domain hosting (extra moving part; Gitea raw is simplest); deferred: `install.ps1`, uploading the script as a release asset, and a **shellcheck CI gate** (shellcheck isn't in the flake — touches ADR-ci-002).