Add dataset card, copyright notice, indexes and tooling

scripts/README.md

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+# Scripts
+
+Derives both CSV indexes from the assets. Pure Python 3, no dependencies: GLB metadata is read
+from each file's glTF JSON chunk and the binary payload is never touched, so probing the whole
+23 GB collection takes about ten seconds.
+
+| script | purpose |
+|---|---|
+| `glb_probe.py` | Library + CLI. Parses one `.glb` and returns rig, animation and geometry stats. |
+| `build_dataset.py` | Walks every asset once and writes `../metadata.csv` and `../animations.csv`. `--link` also hardlinks a source directory into `../glb/`. |
+
+```bash
+python3 build_dataset.py                      # rebuild both tables in place
+python3 build_dataset.py --src /path/raw --link   # ingest a fresh download
+python3 glb_probe.py ../glb/<file>.glb        # inspect a single asset
+```
+
+## Notes on the probe
+
+- Kinematic-tree roots are counted as joints whose parent is not itself a joint, so
+  `num_skeleton_roots > 1` marks a disconnected or multi-tree skeleton.
+- Clip duration comes from the `max` of each animation sampler's input accessor, which glTF
+  stores in the JSON chunk.
+- `animated_joints` intersects a clip's target nodes with the skin's joint set, separating clips
+  that drive a rig from clips that only move object-level nodes.