Add v0.0.1 version tag to cheat sheet footer

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via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

Author: 3 people

docs/projects/grcengineering-cheat-sheet/index.html

@@ -389,6 +389,13 @@
   transition: color 0.2s;
 }
 .page-footer a:hover { color: var(--blue); }
+.version-tag {
+  margin-top: 6px;
+  font-size: 0.65rem !important;
+  opacity: 0.5;
+  letter-spacing: 1px !important;
+  text-transform: uppercase;
+}
 
 /* ── RESPONSIVE ── */
 @media (max-width: 768px) {
@@ -545,6 +552,7 @@ <h1 class="page-title">The <span class="highlight">GRC Engineering</span> Cheat
 
 <footer class="page-footer">
   <p><a href="https://grc.engineering">GRC Engineering</a></p>
+  <p class="version-tag">v0.0.1</p>
 </footer>
 
 <script>