Add blog post: The Quietest Day

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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+      <time class="date" datetime="2026-09-19">19 September 2026</time>
+      <h2><a href="blog/the-quietest-day.html">The quietest day: what really happens when your Bitcoin inheritance arrives</a></h2>
+      <p>A well-designed inheritance should be a non-event on the day it
+         arrives: a block, a confirmation, a balance appearing. What the heir
+         actually does, what to leave them years in advance, and why an address
+         without a key is a tomb.</p>
+      <a class="more" href="blog/the-quietest-day.html">Read the article →</a>
+    </div>
+  </article>
+
+  <article class="post-card">
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