fix(psalm): suppress UndefinedClass for Illuminate\Foundation\Auth\User

CI Psalm reports 6 UndefinedClass errors for Illuminate\Foundation\Auth\User
even though laravel/framework provides it. Local Psalm resolves it via
the workspace autoloader; CI runner doesn't. Add to the existing
UndefinedClass suppression list alongside other framework-resolved
classes.

Co-Authored-By: Cladius Maximus <claude@anthropic.com>

Author: Snider

psalm.xml

@@ -69,6 +69,8 @@
                 <referencedClass name="Core\Service\HealthCheckResult" />
                 <!-- Pending Front\Client frontage subpackage -->
                 <referencedClass name="Core\Front\Client\Boot" />
+                <!-- Laravel framework classes Psalm CI doesn't always resolve -->
+                <referencedClass name="Illuminate\Foundation\Auth\User" />
             </errorLevel>
         </UndefinedClass>