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] 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>