lgtm-phase-commitlisted

# lgtm Phase Commit Commit all uncommitted changes after the one `PLAN.md` phase just finished this session (impl, validation, review). lgtm gives selected phase heading. Local commit only — no PR, CI, branch, release, push. ## Workflow You already know from this session what changed and why. Do not re-read plan docs or re-run checks. 1. `git status --short` + diff to see uncommitted changes. 2. Stage all changes. 3. One local commit. 4. Report commit hash + one-line summary. ## Commit Message Conventional Commits. `<type>(<scope>): <imperative summary>`, scope optional, subject ≤50 char, no trailing period, imperative mood. Types: `feat`, `fix`, `refactor`, `perf`, `docs`, `test`, `chore`, `build`, `ci`, `style`, `revert`. Prefer subject-only. Body only when why not obvious. Always body for breaking, security, migration, revert. Body explains reason or behavior, not an inventory. Wrap 72. Issues at end: `Closes #42`. Never: changed-file list, file inventory, file paths, key-changes section, verification section, blockers section, "this commit", "I/we/now", AI attribution, emoji. ## Guardrails - No empty commit. - Stage all changes. - No push, branch, PR, CI, release tag. Final response concise: commit hash and one-line summary only.