Add comprehensive documentation for the gt swarm feature:
- New docs/swarm.md with full guide to swarm lifecycle, commands, and workflows
- Update reference.md with swarm CLI commands in "Swarm Management" section
- Add architecture note explaining swarm coordination model
The swarm package was fully implemented but undocumented.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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