fix: address review — match og:url trailing slash, remove time-sensitive heading

- og:url now has trailing slash matching canonical link
- "It happened today" → "The factory fixed itself" (not stale on static page)

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

site/index.html

@@ -12,7 +12,7 @@
   <meta property="og:title" content="Disinto — From Vision to Market Fit">
   <meta property="og:description" content="Open-source autonomous startup engine for solo founders. Write the vision, define quality gates — agents build, ship, operate, and find market fit.">
   <meta property="og:image" content="https://disinto.ai/og-image.jpg">
-  <meta property="og:url" content="https://disinto.ai">
+  <meta property="og:url" content="https://disinto.ai/">
   <meta property="og:type" content="website">
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="Disinto — From Vision to Market Fit">
@@ -462,7 +462,7 @@
     </div>
 
     <div class="example">
-      <h2>It happened today</h2>
+      <h2>The factory fixed itself</h2>
       <img src="factory-fixes-itself.jpg" alt="Screenshot: factory files a bug, fixes it, reviews it, and merges — 14 minutes">
       <p>
         We filed a bug about the review lifecycle. <strong>14 minutes later</strong>,