Add new helper functions for town-level agent bead IDs:
- MayorBeadIDTown() → "hq-mayor"
- DeaconBeadIDTown() → "hq-deacon"
- DogBeadIDTown(name) → "hq-dog-<name>"
- RoleBeadIDTown(role) → "hq-<role>-role"
These use the hq- prefix for town-level beads storage, distinct from
the gt- prefix used for rig-level beads.
Mark MayorBeadID() and DeaconBeadID() as deprecated in favor of the
new *Town() variants.
(gt-y24km)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
