fix(landing): wire Formspree contact form endpoint (xpqbonrq)

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

Author: Disentinel

docs/index.html

@@ -837,7 +837,7 @@ <h2 class="section-head__title">No GitHub account required. <span class="red">Th
       Bug reports · Feature proposals · Ideological concerns · Commendations
     </p>
 
-    <form action="https://formspree.io/f/PLACEHOLDER_FORM_ID" method="POST"
+    <form action="https://formspree.io/f/xpqbonrq" method="POST"
           style="display:flex;flex-direction:column;gap:20px">
 
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:16px">