feat(portal): complete masterplan with deterministic budget simulator, RAG assistant, agency cross-tenant view and multi-tenant middleware

src/app/dashboard/layout.tsx

@@ -5,7 +5,8 @@ import {
   Target, 
   FolderGit2, 
   Bot, 
-  ShieldCheck
+  ShieldCheck,
+  Layers
 } from 'lucide-react';
 
 export default function DashboardLayout({
@@ -57,6 +58,16 @@ export default function DashboardLayout({
               <Bot className="w-4 h-4 text-purple-400" />
               Asistente IA Financiero
             </Link>
+            <div className="pt-4 mt-4 border-t border-gray-800/60">
+              <span className="px-3 text-[10px] font-bold uppercase tracking-wider text-gray-400">Agencia OS</span>
+              <Link
+                href="/dashboard/agencia"
+                className="flex items-center gap-3 px-3 py-2.5 mt-1 rounded-lg text-sm font-medium text-gray-300 hover:text-white hover:bg-gray-800/60 transition-all"
+              >
+                <Layers className="w-4 h-4 text-amber-400" />
+                Cartera Cross-Tenant
+              </Link>
+            </div>
           </nav>
         </div>