diff --git a/framework/php/src/Controller/HealthController.php b/framework/php/src/Controller/HealthController.php
index b989cbf..9d9e79a 100644
--- a/framework/php/src/Controller/HealthController.php
+++ b/framework/php/src/Controller/HealthController.php
@@ -4,18 +4,33 @@ declare(strict_types=1);
 
 namespace PhpQml\Bridge\Controller;
 
+use PhpQml\Bridge\Publisher;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\Routing\Attribute\Route;
 
 /**
  * Readiness probe used by the Qt host to detect when the backend is up.
  * See PLAN.md §3 (*Startup*, step 4).
+ *
+ * Publisher is injected purely as a deep-health canary: if the bridge
+ * bundle's autoload or container wiring is broken (e.g. a packaging build
+ * with a dangling vendor path-repo symlink), this controller can't even
+ * be constructed, so /healthz fails 500 instead of misleadingly returning
+ * 200 against a half-loaded bundle.
  */
 final class HealthController
 {
+    public function __construct(
+        private readonly Publisher $publisher,
+    ) {
+    }
+
     #[Route('/healthz', name: 'php_qml_bridge_healthz', methods: ['GET'])]
     public function __invoke(): JsonResponse
     {
-        return new JsonResponse(['status' => 'ok']);
+        return new JsonResponse([
+            'status' => 'ok',
+            'bundle' => $this->publisher::class,
+        ]);
     }
 }