Write orchestrator status check

[jdelfino]

Write the orchestrator status check — the brain that gates PR merges.

File

.github/workflows/orchestrator-check.yml

What

• Trigger: issue events (opened, closed, labeled) and PR pushes
• Parse fixes #N from PR description
• Check if #N has any open child issues with blocking label
• If blockers exist: report failing status check
• If no blockers + new "all clear": run lightweight claude -p to assess re-review need
• If re-review warranted + under cycle cap: trigger pr-review.yml again
• If no re-review needed or cap reached: report passing check
• Report results via GitHub Check Run API

Dependencies

• Blocked by Write PR review workflow #16 (PR review workflow)

Reference

• docs/design.md: Orchestrator Status Check section (Layer 3)