[purp]

Summary

Move unaccepted PRs back to draft when opened ready for review or marked ready, before requesting reviewers. Accept authors with write access or state:accepted on the PR or a referenced issue. Explain the first automatic conversion with one comment; subsequent unaccepted attempts return to draft without another comment.

Depends on #4863. This branch includes its reviewer registry and routing changes; the acceptance layer can be reviewed separately in this comparison.

Related Issue

Related to #4839. Illustrative draft policy is tracked separately in #4952.

Changes

• Share one acceptance implementation between Review Readiness and PR Issue Acceptance, removing the duplicate JavaScript helper.
• Preserve the existing acceptance check's name, triggers, and read-only behavior, using the PR event payload for its metadata.
• Check referenced issues, stop at the first accepted issue, and validate acceptance before loading the reviewer roster.
• Add the requested first-conversion comment and suppress repeats using the existing PR comment history.
• Remove the mechanism explanation from CONTRIBUTING.md and prune duplicated and low-value tests.

Testing

• 56 focused Python tests pass, covering both callers, PR/issue acceptance, one-time comments, pagination, reviewer preservation, and failure boundaries.
• Read-only live GraphQL/CLI checks, workflow shell syntax, and whitespace checks pass.
• Ruff, Actionlint, and Markdown lint were unavailable; downloads are blocked.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

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