Sliced Wasserstein embeddings plus HNSW power color search over 48k paintings

A developer converts painting color distance into an L1 metric via sliced Wasserstein embeddings in OKLab, then uses a from-scratch HNSW index to search 48,695 public-domain paintings at 0.25 ms with recall@10 of 1.000, versus 14 ms brute force.