stitch-ui-design-spec-uview

uView 2.0 (uni-app/Vue 2) design spec for Stitch screen generation. Use when the user mentions uview, uview2, or u-view in a Stitch design request. Do NOT use for uView Pro requests. Outputs a hard-constraints prefix with uView 2 tokens (Primary #3c9cff, u-row/u-col/u-button components) or a CONTRACT_SELECTION_JSON_V1 selector.