Return Reason Normalizer

Return Reason Normalizer standardizes raw customer return reason text into one fixed category. It is designed for support and operations workflows where return reasons need to be normalized before downstream review, routing, or reporting. The app returns a structured result with normalized_reason, confidence, reason_text, matched_keywords, and errors. It does not approve returns, reject returns, assign blame, reply to customers, modify orders, contact anyone, or call external systems. The app is read-only, deterministic, stateless, and does not require login or data storage.