Upload folder using huggingface_hub (part 41)

.gitattributes

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+ "session": "EgoMotionActions/20260914/EC10/20260914_045056_session70",
+ "session_id": "20260914_045056_session70",
+ "primitive": "EC10",
+ "batch": "20260914",
+ "participant": "daihaoxiang",
+ "participant_source": "manifest",
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+  "quaternions": "xyzw, Nokov global"
+ },
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+ "flags": [
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+ ],
+ "sanity": {
+  "status": {
+   "structure": "FAIL",
+   "markers": "WARN",
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+  "verdict": "READY_WITH_WARNINGS",
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+   "FAIL S_DB_EMPTY",
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+   "WARN M_BODY_ID",
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+   "WARN M_TRACKER_LABELS",
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