docs: expand #594 stale decision-lock cleanup guidance

Add allowed/forbidden workflow steps to the review-merge skill and
document the #594 cleanup gate on the Safety-and-Gates wiki page.

docs/wiki/Safety-and-Gates.md

@@ -15,5 +15,7 @@
 5. **Explicit merge confirmation** — `gitea_merge_pr` requires `confirmation="MERGE PR <n>"`.
 6. **No self-review / self-merge** — Authenticated user must differ from PR author for approve/merge.
 7. **Review decision lock** — Live review mutations require validation-phase dry-run and `gitea_mark_final_review_decision`.
-8. **Redaction** — Tokens, passwords, and keychain material never appear in tool output.
+8. **Terminal review hard-stop (#332)** — After a terminal live review mutation, only same-PR merge after `approve` may continue. Durable locks (#559) must not be deleted by hand.
-9. **Wiki publication (#224)** — `docs/wiki/` and the sync helper are prerequisites only. Closing a wiki issue requires live Gitea Wiki proof on the repo Wiki tab. See [Runbooks](Runbooks.md#wiki-publication-readiness-gate-224).
+9. **Stale decision-lock cleanup (#594)** — `gitea_cleanup_stale_review_decision_lock` may clear a durable #332 lock **only** when the last terminal mutation's PR is live-state **merged or closed**, identity/profile gates pass, and apply uses a reviewer-capable profile. Open/ambiguous locks stay fail-closed. Successful cleanup records a durable audit trail.
+10. **Redaction** — Tokens, passwords, and keychain material never appear in tool output.
+11. **Wiki publication (#224)** — `docs/wiki/` and the sync helper are prerequisites only. Closing a wiki issue requires live Gitea Wiki proof on the repo Wiki tab. See [Runbooks](Runbooks.md#wiki-publication-readiness-gate-224).

skills/llm-project-workflow/workflows/review-merge-pr.md

@@ -826,6 +826,75 @@ The final report must identify:
 * whether same-PR merge continuation was allowed
 * whether the run stopped as required
 
+## 26A-1. Stale durable review-decision lock cleanup (#594)
+
+After #559, the review-decision lock is durable under
+`~/.cache/gitea-tools/session-state/` (for example
+`review_decision_lock-prgs-reviewer.json`). That durability can outlive the work
+it protects: a terminal `approve` / `request_changes` on a PR that is already
+**merged or closed** still hard-stops later unrelated reviews under #332.
+
+**Do not** delete session-state files by hand. Use the canonical MCP path.
+
+### When cleanup is allowed
+
+Use `gitea_cleanup_stale_review_decision_lock` when:
+
+1. `gitea_mark_final_review_decision` / live review is blocked by
+   `terminal review mutation already consumed ... (#332)`.
+2. Live Gitea state for the **last terminal mutation's PR** is **merged** or
+   **closed** (no same-PR merge sequence remains).
+3. Active profile identity matches the durable lock (reviewer profile with
+   `gitea.pr.review` for `apply=true`).
+4. Optional pin: pass `expected_terminal_pr` to the prior terminal PR number
+   (for example `586` when resuming after a merged #586 lock).
+
+Recommended sequence:
+
+```text
+gitea_whoami
+gitea_resolve_task_capability(task="cleanup_stale_review_decision_lock")
+gitea_cleanup_stale_review_decision_lock(apply=false, remote=..., org=..., repo=...)
+# inspect is_moot / cleanup_allowed / last_terminal_pr
+gitea_cleanup_stale_review_decision_lock(
+    apply=true,
+    expected_terminal_pr=<last_terminal_pr>,
+    remote=..., org=..., repo=...,
+)
+gitea_resolve_task_capability(task="review_pr")
+gitea_load_review_workflow()
+# continue formal mark + submit for the *new* PR
+```
+
+Successful `apply=true` clears memory + durable store and returns an audit
+record (and posts a durable PR comment on the terminal PR when
+`post_audit_comment` is true and comment permission allows).
+
+Same-profile auto-expire: after `gitea_merge_pr` succeeds for the PR that this
+profile just approved, the decision lock for that profile is cleared
+automatically. Cross-profile locks (for example reviewer approve, merger merge)
+still require `gitea_cleanup_stale_review_decision_lock`.
+
+### When cleanup is forbidden
+
+Refuse / fail-closed — keep #332 hard-stop — when:
+
+* the last terminal PR is still **open** (active review or merge sequence may
+  still apply)
+* live PR state cannot be fetched (ambiguous)
+* no lock or no terminal live mutation exists
+* profile identity does not match the lock
+* apply requested without authenticated identity or `gitea.pr.review`
+* `expected_terminal_pr` does not match the last terminal PR
+
+Do **not** use cleanup to:
+
+* bypass #332 on an open PR
+* replace `gitea_authorize_review_correction` for a mistaken review on a still
+  active PR (#211)
+* auto-approve or auto-merge any PR
+* justify `rm` of session-state files
+
 ## 26B. Per-PR reviewer lease (#407)
 
 Parallel reviewer sessions are allowed only when each session holds a distinct,