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/n1-wordmark-2-links.md

@@ -0,0 +1,12 @@
+
+### N1 · Wordmark + 2 links
+Top-of-page bar: wordmark on the left, two text links on the right ("Pricing" / "Sign in"). No logo image, no menu icon.
+*Use when:* the page has very few destinations.
+*Don't confuse with:* N3 Side-rail (which is vertical).
+
+```html
+<nav class="nav-min">
+  <a class="wordmark">Studio</a>
+  <ul><li><a>Pricing</a></li><li><a>Sign in</a></li></ul>
+</nav>
+```