Upload folder using huggingface_hub (part 121)

.gitattributes

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+ "session": "EgoMotionActions/20260916/LM04/20260916_015555_session20",
+ "session_id": "20260916_015555_session20",
+ "primitive": "LM04",
+ "batch": "20260916",
+ "participant": "wangzhixin",
+ "participant_source": "manifest",
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+ "generated_by": "scripts/sync_dataset.py",
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+ "units": {
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+  "verdict": "READY_WITH_WARNINGS",
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+   "WARN M_SPIKES",
+   "WARN M_TRACKER_LABELS",
+   "WARN S_INDEX_STALE",
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+   "cameras_zup.npz"
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+   "WaistLBack 16mm",
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