This is a third-person character controller for Godot 4.x with vehicle enter/exit functionality. Key features:

- **Movement**: WASD with sprint, camera-relative direction
- **Camera**: SpringArm3D with mouse look (clamped pitch -45° to +30°)
- **Jumping**: Floor check with configurable velocity
- **Vehicle system**: Sphere cast to find nearby cars (collision layer 3), enter/exit with interact key

The car must implement `set_driver()`, `remove_driver()`, `attach_camera()`, and `detach_camera()` methods.