Joins per-file features × resolver family/kind × standardized PCA projection
(PC1-5) × KMeans timbral cluster × audition .wav path into one unwrapped.json
the browser explores without recomputing. Reuses feature_eda.load_matrix so the
matrix matches the MDA exactly. Names the 5 leading PCs as superfeature axes
(Brightness / Timbre / Loudness / Envelope kick-bass / Tonal-noisy), orienting
coords by a stable anchor so poles read right. Contract tests green.