Add documentation for two key features:
1. Mail Routing (internal/mail/router.go):
- Routes messages to correct beads database by recipient
- Town-level (mayor/, deacon/) -> ~/gt/.beads
- Rig-level (rig/polecat) -> ~/gt/rig/.beads
- Uses BEADS_DIR env var for all bd commands
2. Shared Beads for Polecats:
- Polecats use redirect files instead of own beads DBs
- .beads/redirect contains relative path to shared beads
- Eliminates git sync overhead between polecat worktrees
- setupSharedBeads() creates redirect on polecat spawn
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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