sewloreSpecimenTables - Explicitly Paired Fabric Specimen Measurement Tables

Validates long-format paired specimen measurements, normalizes millimetres, centimetres and inches, and compares before and after values within an explicitly identified cohort, specimen, wash cycle and axis. Preserves original values and units and reports incomplete pairs without estimating missing observations. Provides descriptive cohort tables and spreadsheet-conscious CSV export. Example data are entirely synthetic and are not empirical research or fabric performance claims.