Adds a new slot bead type and merge-slot commands for serializing
conflict resolution in the merge queue. This prevents "monkey knife
fights" where multiple polecats race to resolve conflicts.
- Add TypeSlot to bead types
- Add Holder field to Issue struct
- Add bd merge-slot create/check/acquire/release commands
- Add Holder field to UpdateArgs in RPC protocol
(gt-4u49x)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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