Production smoke test on 2026-05-15 found several user-facing quality gaps: seveneleven popwords returns success with empty keywords, some size/limit params do not match returned arrays, LotteCinema returns duplicate theaters, CGV movieCode from movie search can produce empty timetable chains, and broad CU/Emart24 inventory keywords end in hard errors. Acceptance: these cases return clearer fallback messages or normalized results, with targeted tests for each behavior.