Why: independent Review blocked claiming Dev adopted and the task closable before PR #602 merges, and the unlinked Backend rerun. Evidence: Dev PR-head CI run 3682 on437a32e(GATE); Backend main rerun run 3570 job 5779 success (GATE); make test-governance on437a32e(SELF). Impact: planning record and task card only. Refs: https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/602 Co-authored-by: Cursor <cursoragent@cursor.com>