Steve Yegge ce7ca52e98 feat(refinery): implement MR state transition validation (gt-h5n.3) ...

- Update MRStatus to use beads-style statuses (open, in_progress, closed)
- Add CloseReason enum for tracking why MRs were closed
- Implement ValidateTransition() to enforce valid state transitions:
  - open → in_progress (Engineer claims MR)
  - in_progress → closed (merge success or rejection)
  - in_progress → open (failure, reassign to worker)
  - open → closed (manual rejection)
  - closed → anything is blocked (immutable once closed)
- Add convenience methods: Claim(), Close(), Reopen(), SetStatus()
- Add status check methods: IsClosed(), IsOpen(), IsInProgress()
- Update ProcessMR and completeMR to use new state transition methods
- Update display code to handle new status values
- Add comprehensive tests for state transitions

Reference: docs/merge-queue-design.md#state-machine

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-17 14:54:52 -08:00

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