Phase 1: Create agent_ids.go with town-level bead ID helpers
- MayorBeadIDTown(), DeaconBeadIDTown(), DogBeadIDTown()
- RoleBeadIDTown() and role-specific helpers (hq-*-role)
- Add deprecation notices to old gt-* prefix functions
Phase 2: Create town-level agent beads during gt install
- initTownAgentBeads() creates hq-mayor, hq-deacon agent beads
- Creates role beads: hq-mayor-role, hq-deacon-role, etc.
- Update rig/manager.go to use rig beads for Witness/Refinery
This aligns with the two-level beads architecture:
- Town beads (~/gt/.beads/): hq-* prefix for Mayor, Deacon, roles
- Rig beads (<rig>/.beads/): <prefix>-* for Witness, Refinery, Polecats
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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