feat: add hallmark design skill

Anti-AI-slop design skill (greenfield pages, audits, redesigns, design
extraction from URLs/screenshots) -- installed and validated in an
earlier session, was sitting untracked. Full reference library:
components, macrostructures, themes, genres, verbs (audit/redesign).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

skills/hallmark/references/components/h1-marquee.md

@@ -0,0 +1,15 @@
+
+### H1 · Marquee
+A single statement fills the fold. No subhead, no CTA in view.
+*Use when:* the brand or person *is* the message.
+*Don't confuse with:* H4 Stat-Led (which is a number, not a statement).
+
+```html
+<section class="hero-marquee">
+  <h1 class="display-xxl">A statement.</h1>
+</section>
+```
+```css
+.hero-marquee { min-height: 80dvh; display: grid; align-content: end; padding: 0 var(--page-gutter) var(--space-2xl); }
+.display-xxl { font-size: clamp(4rem, 12vw, 12rem); line-height: 0.92; }
+```