Complete non-commercial release and live RetrievalNet

[huzhongyyuan]

Summary

• add the root InfiniteDance Non-Commercial Research License and third-party notices
• release a working live RetrievalNet path: 384-frame config, checkpoint-compatible encoder, raw-audio 55-d feature extraction, and style-aware JSON retrieval
• fix FID/Div reproduction to use the canonical 8,235 clean-train feature distribution
• make fresh training fail clearly when official Llama-3.2-1B weights are absent, while preserving config-only inference checkpoint loading
• synchronize the GitHub download map with the corrected Hugging Face layout and newly released tokens, GT, metric, retrieval, and SMPL-X assets

Validation

• 5 release unit tests pass
• Python compilation and shell syntax checks pass
• RetrievalNet checkpoint loads strictly and returns normalized 256-d embeddings
• real WAV -> 55-d feature extraction passes
• end-to-end retrieval over 61,859 corpus embeddings returns candidates for all six styles
• uploaded Hugging Face LFS SHA-256 values match local assets

Closes #4
Closes #5

[huzhongyyuan]

Release-asset verification completed for this PR. Hugging Face metadata is now license: other / infinitedance-non-commercial-research, and the following remote LFS objects match the local size and SHA-256 exactly:

• InfiniteDanceData/Infinite_MotionTokens_512x1024_3layer_cleandata.tar.gz — 15,448,480 bytes — 09b556a11412f720f40cb7adbd09b7bfa9e2698f4596e4c88e1ede2e4761236c
• InfiniteDanceData/dance/retrievalnet_motion_embeddings.npz — 58,990,675 bytes — 4ec29695f4a17cbff821cd141b7d42eb3f0ab7e65eae4f37e18baa7d7e141ef8
• InfiniteDanceData/dance/evaluation_features_train8235.npz — 2,829,853 bytes — 1dac0d61b0c12c79b44160a66b10809381b2eea592fbec12ade8bfbb476eee29
• InfiniteDanceData/test_eval861_joint_vecs264.tar — 1,570,109,440 bytes — 3c46e7d52abfc0d6a82a36538d6e9ec0698bb63560dd6454c9a5a9109b2547a9
• InfiniteDanceData/infinitedance_smplx_smooth.tar — 4,475,299,840 bytes — 97efd6f6128815e1750aafe4ff500f5b75953c97fa33da09e89cbaaad08afeac
• All_LargeDanceAR/models/retrievalnet/retrievalnet_audio55_motion264.ckpt — 74,588,552 bytes — bf4868da50808d7f15cb05b6dc0713bf66fad4c334356dec887f3e5c0ed79a39

The 1.57 GB evaluation archive contains 861 files; the 4.48 GB SMPL-X archive contains 9,748 joblib-serialized .pkl fits. Obsolete duplicate model paths and the old incorrect token archive are absent from the current release.