codex: verify review collaborators independently - #31
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The plan admission runner reads pull-request reviews with GITHUB_TOKEN. For organization members, GitHub can report author_association=NONE to that token even though a user token sees MEMBER. That makes a valid exact-head approval fail closed and blocks plan admission. Keep the exact-head and latest-review checks, but fall back to the repository collaborator endpoint when the association is not already trusted. The endpoint is repository-scoped and available with metadata:read; a 404 or API failure still rejects the review. Cover both the hidden-member success case and outsider rejection.
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The plan admission runner can see an organization-member approval as author_association=NONE when it uses GITHUB_TOKEN. Keep the exact-head and latest-review checks, then fall back to the repository collaborator endpoint before rejecting the reviewer. A missing collaborator or API failure still fails closed.
This unblocks the trusted admission path for PR #29 without weakening the review gate.
Tests: