jjolla93 275be6c9d3 refactor(datasets): replace untyped dict with typed DatasetInfo dataclass ...

Introduce typed DatasetInfo dataclass to replace untyped dict representation of info.json.

Changes:
- Add DatasetInfo dataclass with explicit fields and validation
- Implement __post_init__ for shape conversion (list ↔ tuple)
- Add dict-style compatibility layer (__getitem__, __setitem__, .get())
- Add from_dict() and to_dict() for JSON serialization
- Update io_utils to use load_info/write_info with DatasetInfo
- Update dataset utilities and metadata to use attribute access
- Remove aggregate.py dict-style field access
- Add tests fixture support for DatasetInfo

Benefits:
- Type safety with IDE auto-completion
- Validation at construction time
- Explicit schema documentation

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..

test_aggregate.py

refactor(datasets): replace untyped dict with typed DatasetInfo dataclass

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test_compute_stats.py

feat(dependencies): minimal default tag install (#3362)

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test_dataset_metadata.py

refactor(datasets): replace untyped dict with typed DatasetInfo dataclass

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test_dataset_reader.py

feat(dependencies): minimal default tag install (#3362)

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test_dataset_tools.py

feat(dependencies): minimal default tag install (#3362)

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test_dataset_utils.py

feat(dependencies): minimal default tag install (#3362)

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test_dataset_writer.py

feat(dependencies): minimal default tag install (#3362)

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test_datasets.py

fix(dataset): cleanup_interrupted_episode wipes image temp dirs (#3405)

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test_delta_timestamps.py

feat(dependencies): minimal default tag install (#3362)

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test_image_transforms.py

feat(dependencies): minimal default tag install (#3362)

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test_image_writer.py

feat(dependencies): minimal default tag install (#3362)

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test_lerobot_dataset.py

refactor(datasets): replace untyped dict with typed DatasetInfo dataclass

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test_quantiles_dataset_integration.py

feat(dependencies): minimal default tag install (#3362)

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test_sampler.py

feat(dependencies): minimal default tag install (#3362)

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test_streaming_video_encoder.py

feat(dependencies): minimal default tag install (#3362)

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test_streaming.py

feat(dependencies): minimal default tag install (#3362)

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test_subtask_dataset.py

feat(dependencies): minimal default tag install (#3362)

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test_visualize_dataset.py

feat(dependencies): minimal default tag install (#3362)

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