JolSetu

JolSetu Vision turns a $1 Gutzeit arsenic kit into a smart sensor: photograph the reacting vial next to its reference card and Meta AI reads it. SAM 3.1 segments the liquid column and the reference card out of messy real-world photos (text prompts liquid + chart), masks are decoded with Meta official meta-sam-parser package, and calibrated CIELAB colorimetry matches the mean color to the kit swatches. Muse Spark explains the result in spoken Bangla with SAFE/UNSAFE/RETEST verdicts and next steps, Muse Image draws pictorial safety sheets for low-literacy families, and the agent loop auto-logs every reading into JolSetu tamper-proof well registry (6,593 real Araihazar wells). Built on the shipped JolSetu PWA (Xylem GSIC 2026). Everything new in this submission was built Oct 26 - Nov 4, 2026; the README section and commit history mark exactly what is new.