Motion and animation

Makes every moving thing in an Expo app a declared moment: named once in a catalog with what starts it, the motion tokens it spends and what it shows when motion is reduced; built with Reanimated 4 on the UI thread from wherever it is now; never in the way of the next touch; looping only while someone can see it; celebrating within a budget, once. One checker proves the code and the catalog agree.

Rules that must hold