The Franka Panda description (robot.urdf + meshes/*.stl) is vendored from the
Isaac Sim project:

  Source:  https://github.com/isaac-sim/IsaacSim
  Path:    source/extensions/isaacsim.robot_motion.cumotion/robot_configurations/franka/
  Commit:  4031678
  License: Apache-2.0

Modifications from the original:
  - Removed the unused meshes/camera_link.stl (the URDF references a box for the
    camera link; the RealSense d415 mesh reference is commented out upstream).
  No other changes; robot.urdf is otherwise unmodified.

Used here as a CI parity-test fixture. See the Isaac Sim repository for the full
Apache-2.0 license text.
