fix: make research email button visible and exclude venv from deployment

Changes:
1. Button visibility: Changed from white/transparent to solid white with black text
   - Makes research@agenticgovernance.digital email clearly visible
2. Deployment optimization: Exclude demos/**/venv/ from rsync
   - Prevents deploying massive Python library directories

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.rsyncignore

@@ -54,6 +54,8 @@ node_modules/
 # ============================================
 al-integration/models/
 al-integration/venv/
+demos/**/venv/
+demos/*/venv/
 .git/
 .gitignore
 package-lock.json

public/integrations/agent-lightning.html

@@ -327,7 +327,7 @@
         <li class="flex items-center">✓ Audit log access (anonymized)</li>
       </ul>
       <div class="flex flex-wrap gap-4">
-        <div class="bg-white/20 backdrop-blur border-2 border-white/40 rounded-lg px-6 py-4"><p class="text-white text-sm mb-1 font-semibold">Research Collaboration Inquiries:</p><a href="mailto:research@agenticgovernance.digital" class="text-white text-lg font-bold hover:text-blue-200 transition">research@agenticgovernance.digital</a></div>
+        <div class="bg-white border-2 border-gray-300 rounded-lg px-6 py-4 shadow-lg"><p class="text-gray-900 text-sm mb-1 font-semibold">Research Collaboration Inquiries:</p><a href="mailto:research@agenticgovernance.digital" class="text-gray-900 text-lg font-bold hover:text-blue-600 transition"research@agenticgovernance.digital</a></div>
         <a href="/researcher.html" class="bg-white text-gray-900 font-bold px-8 py-4 rounded-lg hover:bg-gray-100 transition shadow-lg">View Research Context →</a>
       </div>
     </section>