Adds --stale flag to gt rig reset that:
- Lists all in_progress issues
- Checks if assignee tmux session exists
- Resets orphans to open status with empty assignee
- Skips crew/* assignees (persistent identities)
Also adds --dry-run flag to preview what would be reset.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>