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

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

third_party/Dyn-HaMR/scripts/prepare.sh

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+#!/usr/bin/env bash
+
+
+# Download for HaMeR
+gdown https://drive.google.com/uc?id=1mv7CUAnm73oKsEEG1xE3xH2C_oqcFSzT
+# Alternatively, you can use wget
+#wget https://www.cs.utexas.edu/~pavlakos/hamer/data/hamer_demo_data.tar.gz
+tar --warning=no-unknown-keyword --exclude=".*" -xvf hamer_demo_data.tar.gz
+rm -rf hamer_demo_data.tar.gz
+
+# Download for SLAM
+gdown https://drive.google.com/uc?id=1VD1vGhl_NPzy8mza4Fx6vvqFpnlzZ86L
+mv droid.pth ./_DATA/
+
+# Download for HMP
+gdown https://drive.google.com/uc?id=1_rp_SMxZA6Gjm6Z49M6hXam9kjMD6-GQ
+unzip hmp_model.zip
+mv hmp_model ./_DATA/
+rm -rf hmp_model.zip
+
+wget https://huggingface.co/spaces/rolpotamias/WiLoR/resolve/main/pretrained_models/detector.pt -P ./third-party/hamer/pretrained_models/