Add examples/openarm with a self-contained script that replays a recorded
bimanual-OpenArm episode into an mp4 by driving the official OpenArm MuJoCo
model (enactic/openarm_mujoco, v1) from a LeRobot dataset's observation.state,
plus a README covering model provenance, setup, and troubleshooting.
Co-authored-by: Cursor <cursoragent@cursor.com>
Martino Russi