feat(ha): Hausa/Zulu lexicons, caller=studylabs gate skip, budurwa precision fix — HA P=1.000

feat(api): Hausa and Zulu rewrite rules, lexicons, and aibridge gate wiring

chore(hf-deploy): sync main — SW recall boost +39pp, 28 new derogation patterns

fix: sync _preserve_case + statistical bare-count fix from main

feat: sync main → hf-deploy — SW F1=0.840, EN=1.000, FR=0.970, KI=0.667

deploy: FastAPI + mount_gradio_app pattern for /rewrite + Gradio UI