Add new `gt rig stop <rig>...` command that supports stopping multiple rigs
with the same shutdown semantics as `gt rig shutdown`:
- Stops all polecat sessions
- Stops the refinery (if running)
- Stops the witness (if running)
- Checks for uncommitted work before shutdown (unless --nuclear)
Includes --force flag for immediate shutdown and --nuclear flag to bypass
safety checks. (gt-lhitf)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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