Prevent deletion from an attached mjSpec.

Include obj and stl decoder plugins as sources in CMake builds.

Changes to `dcmotor`:

Expose Drawable Material allowing users to manipulate it directly.

Remove ObjectManager dependency from Material.

Split SceneView into two parts: SceneView and SceneBridge.

Enable multiccd for golden data.

Add `com_pos` to Mujoco Warp shims.

Refactor: Expose flex-related fields directly on mjx.Model.

Modify mj_PLUGIN_LIB_INIT to support multiple plugins in the same compilation unit.

Improve `mju_addToSclSparseInc` with two-pointer loop.

Update MuJoCo README with a link to mjswan.

Remove ``mjWARN_VGEOMFULL``, handle visual geom buffer full warnings in `mjvScene`.

Improve torque-speed Figure (3b) in dcmotor.pdf

Move flex/skin Mesh creation into ModelObjects.