- **claim_gate_review**: Claim an assembled-PR review task (awaiting_pr_review) WITHOUT transitioning it — mirrors QA's claim_review. The assembled diff and the parent task's acceptance criteria are returned inline.
- **unclaim**: Voluntarily release a claim back to pending. The work-in-progress branch is preserved. A PR reviewer who claimed an external review (in_progress) or a gate review (awaiting_pr_review) and cannot finish releases the claim here rather than wedging the lane until the stale-claim reaper.