This is a submission for the Sanity Challenge, Path Two: Vibe-Code Something Strange What I Built Every golgappa wala in India gets asked the same thing before the first bite: pani saaf hai na? Is this water clean? Nobody asks that about their own tap, borewell or tanker, even though contaminated supply is one of the most common ways a whole neighbourhood falls sick at once. The signs show up early (a sewage smell, yellow water, two kids in the same lane with loose motion...