Implement gt rig dock <rig> and gt rig undock <rig> commands for
global/persistent rig control:
- dock: stops witness/refinery, sets status:docked label on rig bead
- undock: removes docked label, allows daemon to restart agents
This is Level 2 (global/persistent) control:
- Uses rig identity bead labels (synced via git)
- Affects all clones of the rig
- Persists until explicitly undocked
Also includes cherry-picked rig identity bead infrastructure:
- RigFields struct for rig metadata
- CreateRigBead and RigBeadID helpers
- Auto-create rig bead for legacy rigs on first dock
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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