Unlike cleanup-orphans (which uses TTY="?" detection), zombie-scan uses
tmux verification: it checks if each Claude process is in an active
tmux session by comparing against actual pane PIDs.
A process is a zombie if:
- It's a Claude/codex process
- It's NOT the pane PID of any active tmux session
- It's NOT a child of any pane PID
- It's older than 60 seconds
Also refactors:
- getChildPIDs() with ps fallback when pgrep unavailable
- State file handling with file locking for concurrent access
Usage:
gt deacon zombie-scan # Find and kill zombies
gt deacon zombie-scan --dry-run # Just list zombies
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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