rdbms-playground/docs/handoff/20260625-handoff-80.md

Session handoff — 2026-06-25 (80)

A long session. It began as the next open-issue item — #37, clause-concept hints — but the act of cutting a branch for it surfaced that this now-public repo had no written, trackable working method. So the bulk of the session became establishing one (ADR-0059) and hardening it through real use, with two follow-up fixes the dogfooding turned up. Both arcs are fully merged; the tree is clean.

§1. State

Branch main at 78272e2. Everything below is merged; no open PRs; worktrees are just the primary (main) + the long-lived website. All feature/fix worktrees were cleaned up with wt-rm.

Suite green at #37's merge: 1831 lib + 8 e2e_pty + 503 it + 200 typing (2542 total), 0 failed, 1 ignored; fmt --check + clippy -D warnings clean (via nix develop -c). The new workflow scripts carry their own local-origin harnesses: test-adr-reserve.sh 10/10, test-wt.sh 16/16, all shellcheck-clean.

Issues: closed this session — #37 (done, ADR-0058) and #38 (won't-do, see §4). Still open — #40 (winget release notes, deferred to next release; see §4). (#36/#39 were closed in earlier sessions.)

§2. What shipped — #37 clause-concept hints (ADR-0058, merged #42)

The deferred ADR-0053 extension: a tier-3 hint.concept.* layer shown by F1 when the cursor sits inside a recognized clause, layered under the per-form hint.cmd.* block. Seven topics — referential actions, 1:n/m:n cardinality, primary key, unique, check, foreign key.

• Mechanism: a new transparent Node::Concept { topic, inner } grammar wrapper records the clause's byte span into WalkContext::concept_spans (append-only — survives the clause being fully matched, unlike pending_hint_mode which clears on match and so only knows the slot boundary). concept_topic_at_cursor walks the full buffer and returns the innermost containing span. No use of the dormant WalkBound::Position.
• Two user forks: detection = "anywhere inside the clause"; all four clause families in v1. Mode-keyed examples (example.simple / example.advanced) honour ADR-0053 D6 for topics reachable in both modes; emit_tier3_block picks by live mode.
• /runda caught two design gaps before any code (clause map missed the simple-mode constraint suffix; single-example model collided with D6) — both fixed. Comprehensiveness gate: a recursive Node::Concept visitor cross-checks grammar wrappers ↔ CONCEPT_TOPICS ↔ catalogue blocks.
• 21 new tests (14 resolver, 3 gates, 3 F1 integration, 1 snapshot).

§3. The working method (ADR-0059, merged #41; fixes #43, #44)

The session's main artifact — the trackable flow for the public repo:

• PRs onto a protected main (always-green; one direct-push carve-out, §4), one logical change per branch, conventional prefixes, the /runda/DA review pasted into each PR. Merge commits (--no-ff); never rebase/squash (append-only).
• One worktree per branch (<repo>-worktree-<segment>) — never switch the primary checkout. scripts/wt-new.sh <branch> (off origin/main, --no-track) / scripts/wt-rm.sh <branch> (removes only the named worktree).
• Reserve-first ADR numbering — scripts/adr-reserve.sh <slug>. The fix for the real collision problem: a contiguous integer needs an allocator and plain git branches have none, so main is the registry and an atomic git push is the lock (compare-and-swap, retried on contention), recorded in the append-only ledger docs/adr/RESERVATIONS.log. The number is stable from creation (safe in immutable commit messages + cross-refs). Supersedes ADR-0000's placeholder-until-merge default; subproject namespaces (ADR-website/ci-NNN) unchanged.
• Branch protection (you applied in Gitea): require PR + the ci / gate* check + up-to-date-before-merge; owner whitelisted for direct push (the reservation ledger line, now also handoff/session docs — §4).
• Fixes found by dogfooding:
  • #43 — wt-clean (auto-sweep of all merged worktrees) → explicit wt-rm <branch>. The auto-sweep would have deleted long-lived branches (website, ci) since they're merged into main too. Also wt-new --no-track: branching off origin/main had set the new branch's upstream to origin/main, so a bare git push errored on a name-mismatch and suggested the dangerous HEAD:main.
  • #44 — CI dedupe: push: branches: [main] (was ['**']) so a push to a PR'd branch no longer runs the gate twice. On Gitea the push and pull_request runs were byte-identical — Gitea has no merge-preview ref; its pull_request checks out refs/pull/N/head, the same commit a branch push would (docs.gitea.com/usage/actions/faq). Keeping the gate on pull_request is forward-compatible: if Gitea ever adds the merge ref, the runs upgrade to testing the merged result for free.

§4. Decisions

• #38 closed — won't build the pre-submit-diagnostic tier-3 route. The ADR-0053 D6 deferral reasons still hold: Diagnostic carries no class key (a class field would have to thread through every diagnostic-creation site — broad change) for marginal value (tier-2 already surfaces diagnostics live; many classes duplicate the runtime-error/clause-concept tiers). Reconsider only if a diagnostic class has genuinely unique teaching value. Rationale recorded on the issue.
• #40 deferred (open): wire CHANGELOG into komac's winget --release-notes-url. Best coupled to the next v* release + first real winget update test — the initial winget PR to microsoft/winget-pkgs is still unconfirmed after several days, so end-to-end validation needs a confirmed package first.
• Docs direct-push carve-out (this handoff is the first to use it): handoff / session docs (and the reservation ledger) are owner direct-pushed to main, not PR'd. See §5 for why a PR doesn't work.

§5. Process lessons (now in ADR-0059 / CLAUDE.md)

• Update a branch in ONE lane — locally (git fetch && git merge origin/main), not the Gitea "Update branch" button when a conflict is possible. The button silently mis-resolved the README clash on #42 (dropped the 0059 index row) and, combined with a local merge, diverged the PR branch; healed with an append-only merge (no force-push).
• Primary checkout rests on main; feature work in worktrees. Mid-session the primary was stuck on feat (bootstrap artifact), which is what made worktree cleanup awkward — there was no main checkout holding the scripts. Resolved by switching the primary to main and moving feat to a worktree.
• Docs-only PRs are blocked by the required gate. paths-ignore (docs/**, **/*.md) means a docs-only change posts no ci / gate run, and branch protection requires ci / gate* — so the required check never arrives and the PR is stuck "expected/waiting." That is the concrete reason handoff/session docs are direct-pushed (§4). If docs-via-PR is ever wanted, add a "skipped → success" gate shim (or drop the paths-ignore).
• Gitea CI specifics worth remembering: no merge-preview ref (above); the reserve script's CAS via atomic push; --no-track on branch creation to avoid the inherited-origin/main upstream.

§6. Next

• Next session is free to pick a feature — no specific item is queued; consult docs/requirements.md for the remaining backlog (e.g. TT4 / Tier-4-in-CI still not wired; D3 packaging — winget pending confirmation; the larger deferred UX items: tutorial system, session-log + markdown export V4, multi-line input I1, ER-diagram export V3).
• #40 when the next release happens (with the first winget update test).
• Use the new flow: wt-new to start a branch, adr-reserve the moment an ADR is needed, PR onto main, wt-rm when done. Push/merge stay your steps; agents prepare but never push.

§7. Process pins

• Commits user-confirmed, no AI attribution, append-only. Push/merge are the user's steps. This handoff + the §4 carve-out doc amendments are direct-pushed to main by the owner (docs-only, paths-ignored, owner-whitelisted).