Implement two-level beads architecture for agent lookups:
- Town-level agents (Mayor, Deacon) now use hq- prefix and are
looked up in town beads (~/.beads/)
- Rig-level agents continue using rig prefix (e.g., gt-) and are
looked up in rig beads
Changes:
- Add MayorBeadIDTown(), DeaconBeadIDTown(), DogBeadIDTown() helpers
- Add GetTownBeadsPath() for town beads path resolution
- Update gt status to pre-fetch town-level agent beads
- Update agentIDToBeadID() to use town-level IDs
- Update agent_beads_check.go to check/fix in correct tier
- Update agentAddressToIDs() in deacon.go
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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