- Added a new animation specification document for Phase 9 Task 5 detailing the requirements for rig animation controls.
- Introduced a new `StickmanRig` script to manage the facing direction and joint bending for the rig.
- Implemented UI elements in the test harness for selecting animations, controlling playback (play/pause/resume/stop), and toggling loop mode.
- Enhanced the `test_harness.gd` script to handle animation playback state and UI interactions.
- Updated documentation in `AGENTS.md`, `README.md`, and `RIGGING.md` to reflect the new animation features.
ryan