添加 hallmark 技能

skills/hallmark/references/components/t2-logo-wall-hairline.md

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+### T2 · Logo wall (hairline)
+A row of customer logos, monochromatic, separated by hairline rules. No card boxes, no shadows.
+*Use when:* you have recognisable customers and want to surface them quietly.
+*Don't confuse with:* the AI-default 6-logo box grid; this version refuses card boxes.
+
+```html
+<section class="logo-wall">
+  <ul>
+    <li><img src="" /></li>
+    <li><img src="" /></li>
+    <li><img src="" /></li>
+  </ul>
+</section>
+```
+```css
+.logo-wall ul { display: grid; grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr)); gap: 0; }
+.logo-wall li { padding: var(--space-md); border-right: 1px solid var(--color-rule); display: grid; place-items: center; }
+.logo-wall img { filter: grayscale(1); opacity: 0.7; }
+```