Changes:
- Remove creation of mayor/mail/ directory with legacy JSONL inbox
- Initialize town-level beads DB (gm- prefix) via `bd init` instead of
creating a .beads/redirect placeholder file
- Update help text and next-steps output to reflect new architecture
Town beads (gm-*) store mayor mail, cross-rig coordination, and handoffs.
Rig beads remain separate with their own prefixes.
Closes: gt-jpt
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>