Add new 'gt rig start <rig>...' command that starts witness and refinery
on patrol for one or more rigs. Similar to 'gt rig boot' but supports
multiple rigs in a single invocation.
- Iterates over all provided rig names
- Skips already-running agents with clear output
- Reports success/failure per-rig with summary
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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