data: validator blind spots — id pattern, type-vs-filename, valid_till format, duplicate coordinates (two real dupes found)

[shauryagangrade]

Problem

scripts/validate-places.mjs misses several classes of bad data:

1. type must match filename (promised by places.schema.json:22) — not checked
2. id pattern from the schema (<city-prefix>-<type>-<number>) not enforced — bare numeric ids like 96545 coexist with mum-gov_offices-01
3. valid_till format unchecked (only verified.on is date-validated)
4. near-duplicate coordinates unchecked. Real examples currently in the dataset:
   • amritsar-sat-01 (Ashok Vatika Public School, G.T. Road) and amritsar-sat-02 (Invictus International School, Loharka Road) share identical coords 31.635666,74.87875 — different schools, so at least one coordinate is wrong
   • mumbai-sat-01 (Tardeo) and mumbai-sat-05 (Colaba) share 19.054999,72.869203 — ~7 km apart in reality
5. added_by identity drift: "Yojeet(Circout-sudo)" vs "Yojeet(Circout)" — same person, two identities

Fix

Fix the two wrong coordinates (verify against Google Maps), normalize added_by, then extend the validator: enforce 1-3, warn on coords closer than ~50 m between different-named places, and consider an allowed-contributors or format check for added_by.

Acceptance criteria

• Both duplicate-coordinate pairs resolved
• Validator enforces id/type/date rules and warns on near-dupe coords