feat: release design system engine, studio and component contracts

examples/component-showcase/app/pages/themes.wrn

@@ -11,7 +11,7 @@ page ThemesGuide {
       <section class="guide-section"><h2>Default</h2><p>Balanced surfaces, borders, elevation, and radius.</p></section><section class="guide-section"><h2>Soft and sharp</h2><p>Choose friendly rounded surfaces or dense operational styling.</p></section><section class="guide-section"><h2>Glass</h2><p>Use translucent layered surfaces while retaining semantic tokens.</p></section>
       <section class="guide-section"><h2>Keep theme overrides in one place</h2><p>Override design tokens at your application root so all components inherit the same appearance. Start with radius and brand color, then review overlays, forms and navigation together.</p><pre><code>:root <span>&#123;</span> --wrn-radius: 8px; --wrn-color-primary: #7c3aed; <span>&#125;</span>
 &lt;Button label="Primary action" color="primary" /&gt;</code></pre><h3>Verify the result</h3><p>Open the matching component page, change its options, and try the keyboard controls. Copy the demonstrated configuration into your page, then replace sample content with your data.</p></section>
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       <nav class="guide-next"><a href="/components/button">Explore components <span aria-hidden="true">→</span></a><a href="/block-library">Browse blocks <span aria-hidden="true">→</span></a></nav>
     </article>
   }