- kv/location-pin.ts mirrors sessions.ts shape: writePin/getPin/clearPin, key loc:<chat_id> (chat-scoped, claim-derived — never user-id scoped across keys)
- PIN_TTL_SECONDS=300; writePin is the only write path, expirationTtl on the same line referencing the named constant
- getPin is a defensive read: parse guard + shape guard + |lat|<=90 / |lon|<=180 range guard (V5 Input Validation) — corrupt records return null
- privacy.test.mjs: storageModules now scans kv/location-pin.ts, so PG1 (same-line TTL) and PG2 (no persistence-shaped exports) apply automatically
