v0.2.0#2
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Add prototype assets for bionic hand for Myochallenge24
…L_hand class Bug 1 (arms_assets.xml): Remove deprecated `convexhull="false"` compiler attribute removed in MuJoCo 3.x. Bug 2 (arms_chain.xml): Fix include paths from `./../../MPL_sim/assets/simpleHand*.xml` to simple relative `simpleHand*.xml`. The old paths assumed a submodule layout where MPL_sim is a sibling directory; the pip package layout has all assets in one directory. Bug 3 (arms_assets.xml + simpleHandR_assets.xml): Define `MPL_hand` default class as a child of `MPL_arm` in arms_assets.xml so it is always available when the combined arms+hands model is loaded. Remove the duplicate top-level `MPL_hand` default from simpleHandR_assets.xml (which caused "unknown default class MPL_hand" when included alongside arms_assets.xml because MuJoCo requires child-class defaults to be nested). Bug 4 (simpleHandL_chain.xml + simpleHandR_chain.xml): No change needed — `childclass="MPL_hand"` on body elements is correct once MPL_hand is properly defined as a nested child default. These bugs are currently worked around at runtime by myosuite's patching layer in myosuite/utils/simhive_assets.py. Once this PR merges and a new mpl_sim release is cut, that patching layer can be removed.
fix: MuJoCo 3.x compat — remove convexhull, fix MPL_hand class, fix include paths
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