Screener setup
The screener needs a one-time fund index (mf-index.json) placed next to this file, because mfapi.in exposes a fund's category only on its individual endpoint — not in the bulk list. Generate it with the included build-index.py (it reads AMFI's master file in one shot), upload the resulting mf-index.json here, and the screener lights up. The Analyze tab works without it.