What problem does it solve? Pre-merge code review often rubber-stamps PRs based on green CI on the branch head, missing failures that only appear after merging with main, stale approvals, and checks that cannot actually fail. This Skill performs a rigorous, read-only pre-merge review that proves every finding by running the real suites. ## Core Features & Use Cases - Merge-aware diffing: Diffs the branch against the merge-base with main in a dedicated git worktree, test-merges when behind, and handles fork PRs via gh pr diff fallback. - Verified findings: Runs vitest, tsc, turbo, and pytest suites, watches new lints fail by breaking them deliberately, and scores every finding 1-10 with quoted file:line evidence. - Review governance: Detects open review rounds, unresolved threads, stale approvals by comparing review commit IDs to headRefOid, CODEOWNERS gaps, and incorrect issue-closing links. - Use Case: Before merging PR #1219, run the review to discover it passed 261/261 tests on its own head while a lint it added goes red against main, then receive structured edit suggestions to post in your own words. ## Quick Start Ask the assistant to review PR 1219 before merging and report any findings verified against the actual test suites.