Initial snapshot: hand motion pipeline (Dyn-HaMR + dex-retargeting + SPIDER)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

requirements/retarget.txt

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+# Install into a compatible environment after selecting its Torch/CUDA runtime.
+# Observed versions, not a complete cross-platform dependency lock.
+dex-retargeting==0.5.0
+mujoco==3.5.0
+scipy==1.17.1
+numpy==2.4.6
+h5py==3.16.0
+imageio
+imageio-ffmpeg
+Pillow

requirements/retarget_observed.json

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+{
+  "dex-retargeting": "0.5.0",
+  "mujoco": "3.5.0",
+  "numpy": "2.4.6",
+  "scipy": "1.17.1",
+  "torch": "2.7.1+cu128",
+  "torchvision": "0.22.1+cu128",
+  "nlopt": "2.11.0",
+  "pin": "4.1.0",
+  "imageio": "2.37.3",
+  "Pillow": "12.3.0"
+}