Adds two new commands to transition polecats back to idle state:
- gt polecat done (alias: finish): Transitions from working/done/stuck
states to idle, clearing the assigned issue. For normal workflow when
work is complete but session was not properly cleaned up.
- gt polecat reset: Force resets any state to idle. For recovery when
polecat is stuck in an unexpected state.
Both commands check that the session is stopped before modifying state.
Fixes gt-s3m0
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>