Add documentation for crew workers using cross-rig worktrees:
- Added Cross-Rig Worktrees section to crew.md.tmpl template
- Created docs/understanding-gas-town.md with role taxonomy
Key points documented:
- Crew vs Dogs distinction (dogs = Deacon infra, not user work)
- Identity preservation across rigs (BD_ACTOR stays the same)
- When to use worktrees vs dispatch to local workers
- Directory structure convention: ~/gt/<rig>/crew/<source-rig>-<name>/
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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