fix: properly await worker teardown in integration tests to prevent open handles

AfterAll was calling worker.close() with a callback but not awaiting it,
so Cucumber resolved the hook immediately leaving the HTTP server, Redis,
and DB connections open. Node.js would then hang indefinitely waiting for
those handles to close.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: github-manager

test/integration/features/shared.ts

@@ -58,12 +58,15 @@ BeforeAll({ timeout: 1000 }, async function () {
 })
 
 AfterAll(async function() {
-  worker.close(async () => {
-    await Promise.all([
-      dbClient.destroy(),
-      rrDbClient.destroy(),
-      cacheClient.disconnect(),
-    ])
+  await new Promise<void>((resolve) => {
+    worker.close(async () => {
+      await Promise.all([
+        cacheClient.disconnect(),
+        dbClient.destroy(),
+        rrDbClient.destroy(),
+      ])
+      resolve()
+    })
   })
 })