Check card ids you combined yourself for clashes before briefing: black-and-white film with a colour grade, two grades stacked, daylight with a night palette, an anamorphic lens in a vertical frame, an interior light with an outdoor subject. Example: {"hand_ids": ["film-pushed-bw-1600", "color-teal-orange"], "aspect": "9:16"}. ok: true means clean. deal_hand and brief already lint their own output.