Morphology specs (joint-origin morphs and cross-embodiment compositions), not appearance assets.
Orthogonal to appearance_assets: the same skeleton can change paint and link origins independently.

This folder is JSON only. Official robot URDFs and meshes are **not** stored here.

1. Fetch RoboTwin 2.0 embodiments: see `../GET_OFFICIAL_URDF.md`.
2. Apply a spec: `python ../scripts/apply_morph_to_urdf.py --source <official.urdf> --spec morphs.json --morph-id link_short_3pct`.