Add dispatch-swarm-work step to mol-witness-patrol formula that:
- Queries bd ready --parent=<epic> to find ready swarm tasks
- Finds idle polecats via agent beads
- Dispatches work via gt sling <task> <rig>/<polecat>
Also updated:
- SWARM mail handling to store epic_id in labels
- check-swarm-completion to use beads discovery model
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>