Implements `bd swarm create <epic-id>` to create a swarm molecule
that orchestrates parallel work on an epic.
Features:
- Creates molecule with mol_type=swarm for discovery
- Links to epic via relates-to dependency
- Validates epic structure before creation
- Auto-wraps single issues in an epic when needed
- Optional --coordinator flag to specify coordinator agent
- Supports JSON output for machine consumption
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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