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- Memory heuristic rounds up to the nearest MB. - `simulate` reports total memory currently allocated in the info box. - All example models use `<size memory/>` rather than legacy attributes. - Regenerated `example_saved.xml` and reformatted original model in [overview chapter](https://mujoco.readthedocs.io/en/latest/overview.html?#examples). - `<size>` top-level section does not get written if empty. PiperOrigin-RevId: 486702670 Change-Id: I0306e335f32344c59562ba606664ec9d2101f8a8
