feat(menu): move Agentic to dedicated agents group

Moves from dashboard group to the new agents group in AdminMenuRegistry,
giving it top-level visibility as the platform's primary capability.

Co-Authored-By: Virgil <virgil@lethean.io>

Service/Boot.php

@@ -58,14 +58,14 @@ class Boot extends ServiceProvider implements ServiceDefinition
     /**
      * Admin menu items for this service.
      *
-     * Agentic is positioned in the dashboard group (not services)
-     * as it's a cross-cutting AI capability, not a standalone product.
+     * Agentic has its own top-level group right after Dashboard —
+     * this is the primary capability of the platform.
      */
     public function adminMenuItems(): array
     {
         return [
             [
-                'group' => 'dashboard',
+                'group' => 'agents',
                 'priority' => 5,
                 'entitlement' => 'core.srv.agentic',
                 'item' => fn () => [