Remove the mrqueue side-channel from gastown. The merge queue now uses
beads merge-request wisps exclusively, not parallel .beads/mq/*.json files.
Changes:
- Delete internal/mrqueue/ package (~830 lines removed)
- Move scoring logic to internal/refinery/score.go
- Update Refinery engineer to query beads via ReadyWithType("merge-request")
- Add MRInfo struct to replace mrqueue.MR
- Add ClaimMR/ReleaseMR methods using beads assignee field
- Update HandleMergeReady to not create duplicate queue entries
- Update gt refinery commands (claim, release, unclaimed) to use beads
- Stub out MQEventSource (no longer needed)
The Refinery now:
- Lists MRs via beads.ReadyWithType("merge-request")
- Claims via beads.Update(..., {Assignee: worker})
- Closes via beads.CloseWithReason("merged", mrID)
- Blocks on conflicts via beads.AddDependency(mrID, taskID)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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