Add git-state subcommand to gt polecat for Witness pre-kill verification.
Checks working tree, unpushed commits, and stashes to determine if a
polecat worktree is clean (safe to kill) or dirty (needs cleanup).
Usage: gt polecat git-state <rig>/<polecat> [--json]
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>