Add LeRobot metadata, data, provenance, and assets

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provenance.json

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+{
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+  "description": "All 8 SCARA real-robot datasets in one LeRobot dataset, unified RGB camera schema {top, wrist, wrist_down}; cameras absent from a session are black-filled (synthetic_cameras). IR streams excluded here (see per-dataset originals). Episode layout is contiguous per source dataset, so ranges below segment the dataset exactly.",
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+}