Upload folder using huggingface_hub (part 918)

.gitattributes

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+ "session_id": "20260916_023054_session30",
+ "primitive": "LH01",
+ "batch": "20260916",
+ "participant": "wangzhixin",
+ "participant_source": "manifest",
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+  "left": "cc5681142208e29a",
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+  "quaternions": "xyzw, Nokov global"
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+  "status": "ok",
+  "date": "2026-09-08"
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+ "flags": [],
+ "sanity": {
+  "status": {
+   "structure": "WARN",
+   "markers": "WARN",
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+  },
+  "verdict": "READY_WITH_WARNINGS",
+  "issues": [
+   "WARN M_BODY_ID",
+   "WARN M_RIGID",
+   "WARN M_SPIKES",
+   "WARN M_TRACKER_LABELS",
+   "WARN S_INDEX_STALE",
+   "WARN S_PARTICIPANT",
+   "WARN T_UNITS"
+  ]
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+  "generated_at_utc": "2026-10-14T12:19:50.648356+00:00",
+  "generated_by": "scripts/canonicalise_dataset.py",
+  "frame": "Z-up, metres, levelled per Nokov capture block; z = 0 at the Nokov origin; x/y heading as Nokov (global, not per-take)",
+  "R_canon_nokov": [
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