Closes #334 - Add workflows/review-merge-pr.md with reviewer-only gates and steps - Add schemas/review-merge-final-report.md with mutation ledger fields - Turn SKILL.md into task-mode router; replace inlined §F/§G with links - Point review/merge templates at extracted workflow - Add doc-contract tests for split structure Part of #333. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>