What does a minimum viable visual system include?
The minimum is the mark, one background colour, one type for the name and another for the text, and the sheet that says how they are used on the door, the menu and the avatar. Less than that is not a system: it is a drawing. Check that with those pieces you can make Saturday's story and order the menu without inventing a style. If one is missing, the minimum is not there. The logo is handed over and called a system. The shift does not know which background to use and picks a different one every week. A minimum folder: master, avatar, menu header and a two-sided sheet. Whoever opens on Monday can publish without calling the studio.