feat(blog): grouped list, pinned posts, author/date/copy-link metadata (#20)

Co-authored-by: Alice <alice@prismshadow.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/landing/content/blog/introducing-penguinharness.en.md

@@ -2,6 +2,7 @@
 title: "Introducing PenguinHarness: agents that build agents"
 date: 2026-07-17
 category: news
+pinned: true
 excerpt: We proved agents can self-evolve in our GDPevo Benchmark — now we are bringing that capability to everyone. The first open-source harness with recursive self-improvement covers everything from one-sentence agent construction to continuous self-evolution.
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