Skill: review-a-contributor-pr

Use for every PR whose head is not in different-ai/openwork (isCrossRepository: true). Fork PRs get no automatic clearance: warden.yml skips them (head.repo.full_name == github.repository, no secrets on fork heads) and warden-clearance.yml refuses them. Nothing enforces DCO or the ee/ CLA today either; two external commits were merged on 2026-09-09 without Signed-off-by. Open PRs #4733 (fork guard: DCO + ee/ label status) and #4709 (DCO + EE CLA policy and status gate) will automate parts of this; this checklist does not depend on them and stays required after they land, because they gate the contributor, not the reviewer.

Every item must be answered explicitly in the review comment. Blocked on any item means no approval and no merge.