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/h3-quote-led.md

@@ -0,0 +1,11 @@
+### H3 · Quote-Led
+A pull-quote with attribution is the hero. Your headline is borrowed credibility.
+*Use when:* you have a real testimonial that earns the front page.
+*Don't confuse with:* T3 Single huge quote (which lives mid-page, not in the hero slot).
+
+```html
+<section class="hero-quote">
+  <blockquote class="display-italic">"…"</blockquote>
+  <p class="attribution">— Name, Role, Company</p>
+</section>
+```