feat: release design system engine, studio and component contracts

docs/ui-component-audit.md

@@ -35,7 +35,6 @@ Validation: 243 UI/showcase tests passed; 201 example pages passed compiler, acc
 
 Phone-width review: all 102 pages fit the viewport at 390px. Fixed inner overflow in password requirements and pagination. Verified light/dark stylesheet switching and saved appearance preferences; added a regression for switching before the theme runtime loads.
 
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 ## Catalog and interaction update
 
 The catalog now separates 84 primitive components, 14 blocks, and six standalone examples. `/preview` and `/templates` link to working pages with copyable source; the legacy design-system routes and four requested shell components are removed from the showcase. Package exports remain compatible.
@@ -46,7 +45,6 @@ Fixed anchored calendar/time overlays, datetime selection, controlled modal rend
 
 Validation: 380 UI, showcase and CSR tests pass; 211 example pages pass compiler/accessibility/formatter checks; the showcase production build succeeds. Browser checks confirm external modal open/close, anchored calendar, rating selection, list reordering/editor input, right-click menu, table size 25 with matching selected item, gallery routes and sidebar active state. These checks do not cover every optional configuration or external provider integration.
 
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 ## Follow-up: controls and gallery separation
 
 Added fractional Rating and RangeSlider examples, named Card header/footer slots with visibility controls, custom TimePicker within DatePicker, calendar completion/outside dismissal, implicit switch label association, native search-clear suppression, multi-file names, interactive LegendIndicator, bar/line Chart data props and expanded rich-text formatting. Centered modals use data-modal-close for custom dismissal buttons. Confetti now uses a canvas particle burst with reduced-motion handling.