point guide og:image at the new guide-og-image.png

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: frenchie4111

docs/guide.html

@@ -8,7 +8,9 @@
 
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   <meta property="og:description" content="Run many Claudes in parallel. A short guide to git worktrees and the multi-agent workflow." />
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+  <meta property="og:image" content="https://harness.mikelyons.org/guide-og-image.png" />
+  <meta name="twitter:card" content="summary_large_image" />
+  <meta name="twitter:image" content="https://harness.mikelyons.org/guide-og-image.png" />
   <meta property="og:url" content="https://harness.mikelyons.org/guide.html" />
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