Purpose: summarize cluster-structure interpretation in the frozen baseline.

• Ward hierarchical clustering (k=7) on standardized descriptor space.
• Silhouette used as compact quality indicator.

• full46 keeps moderate usable structure (silhouette 0.2929).
• core23 keeps interpretability but with more moderate separation (0.2681) after optimization.

Clustering is interpreted jointly with correlation and distance metrics, not as a standalone acceptance criterion.