chore: gardener housekeeping 2026-04-05

review/AGENTS.md

@@ -1,4 +1,4 @@
-<!-- last-reviewed: f32707ba659de278a3af434e3549fb8a8dce9d3a -->
+<!-- last-reviewed: 33eb565d7e0c5b7e0159e1720ba7f79126a7e25e -->
 # Review Agent
 
 **Role**: AI-powered PR review — post structured findings and formal
@@ -9,7 +9,7 @@ whose CI has passed and that lack a review for the current HEAD SHA, then
 spawns `review-pr.sh <pr-number>`.
 
 **Key files**:
-- `review/review-poll.sh` — Cron scheduler: finds unreviewed PRs with passing CI. Sources `lib/guard.sh` and calls `check_active reviewer` — skips if `$FACTORY_ROOT/state/.reviewer-active` is absent.
+- `review/review-poll.sh` — Cron scheduler: finds unreviewed PRs with passing CI. Sources `lib/guard.sh` and calls `check_active reviewer` — skips if `$FACTORY_ROOT/state/.reviewer-active` is absent. **Circuit breaker**: counts existing `<!-- review-error: <sha> -->` comments; skips a PR if ≥3 consecutive errors for the same HEAD SHA (prevents flooding on repeated review failures).
 - `review/review-pr.sh` — Creates/reuses a tmux session (`review-{project}-{pr}`), injects PR diff, waits for Claude to write structured JSON output, posts markdown review + formal forge review, auto-creates follow-up issues for pre-existing tech debt. Before starting the session, runs `lib/build-graph.py --changed-files <PR files>` and appends the JSON structural analysis (affected objectives, orphaned prerequisites, thin evidence) to the review prompt. Graph failures are non-fatal — review proceeds without it.
 
 **Environment variables consumed**: