Replace complex address-based routing with simple town root lookup.
All mail goes to ~/gt/.beads/ (town beads), eliminating the broken
rig-level routing.
Two-level model:
- Town beads (~/gt/.beads/): ALL mail and coordination
- Clone beads (<rig>/crew/*/.beads/): Project issues only
Fixes: gt-4qey
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>