Convoys in town beads track issues in rig beads via external:rig:id
references. When bd close runs in a rig, the convoy auto-close logic
only checks the local database, missing convoys in town beads.
This adds `gt convoy check` to bridge that gap:
- Finds all open convoys in town beads
- Checks if all tracked issues (across rigs) are closed
- Auto-closes completed convoys
- Sends notification if convoy has notify address
Can be called manually or by deacon patrol.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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