Match matlab

[johnwaalsh]

Improves MATLAB parity for IFCB feature extraction.

• Replaces sklearn k-means segmentation with a MATLAB-style float32 1D k-means path.
• Matches MATLAB blob filtering and 8-connected component behavior.
• Fixes blob ordering, centering, orientation, and nearest-neighbor rotation behavior.
• Adds Benkrid perimeter calculation for MATLAB-compatible perimeter-derived features.
• Updates biovolume and surface-area calculations with MATLAB-like distance maps, masking, and float32 accumulation.
• Handles degenerate convex hull cases more robustly.
• Matches MATLAB-style summed feature accumulation and zero-to-NaN ratio outputs.
• Writes slim feature CSVs with stable float formatting.