Add trademark notice to footer

Clawback Protocol™ — USPTO Serial No. 99657348

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

Author: Reeseysan

index.html

@@ -333,7 +333,8 @@ <h3>Instant Revocation</h3>
 
   <footer>
     <p>AGPLv3 &middot; <a href="https://second2none.net">Second 2 None LLC</a> &middot; <a href="https://github.com/clawback-protocol/spec">GitHub</a></p>
-    <p style="margin-top: 8px;">&copy; 2026 Second 2 None LLC</p>
+    <p style="margin-top: 8px;">Clawback Protocol&trade; &middot; USPTO Serial No. 99657348</p>
+    <p>&copy; 2026 Second 2 None LLC</p>
   </footer>
 
 </body>