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Multi-dataset training support: - NewMultiLeRobotDataset with per-dataset feature mapping, auto-padding, per-dataset transform pipelines, and weighted sampling - MultiDatasetMeta shim compatible with EpisodeAwareSampler and make_policy - WeightedEpisodeAwareSampler for proportional cross-dataset sampling - SubDatasetConfig / MultiDatasetConfig in training configs - DatasetTransformPipeline with built-in PadAction, PadState, ResizeImages - Factory and training script wired up for multi-dataset path RoboMME environment integration: - RoboMMEEnv config and Gymnasium wrapper (robomme.py) - robomme optional dependency in pyproject.toml Made-with: Cursor