JSON User Name Extraction

A data ingestion pipeline receives API responses as JSON strings containing user records and must filter and project specific fields before writing to a downstream store. Given a JSON string containing an array of user objects (each with `name`, `age`, `status`, `country` properties), return a list of names of users where `status` is `"active"` AND `age` is at least `min_age`. **Input:** `json_string` — a JSON-encoded array of user objects; `min_age` — an integer minimum age. **Output:** A list of name strings for users matching both filter criteria.