Implement gt rig park <rig> and gt rig unpark <rig> commands:
- park: stops witness/refinery, sets status=parked in wisp layer
- unpark: clears parked status, allows daemon to restart agents
This is Level 1 (local/ephemeral) control - affects only this town
and disappears on wisp cleanup. Exports IsRigParked() for daemon use.
(gt-vxv0u)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
