diff --git a/src/gate-e2e-fixture.mjs b/src/gate-e2e-fixture.mjs
new file mode 100644
index 0000000..5406250
--- /dev/null
+++ b/src/gate-e2e-fixture.mjs
@@ -0,0 +1,8 @@
+// gate E2E fixture — intentionally subtle async issue for the adversarial gate to catch
+export async function getActiveModels(cache, discover) {
+  // BUG: fire-and-forget refresh — returns possibly-stale cache without awaiting discovery
+  if (cache.isEmpty()) {
+    discover(); // missing await — race: caller gets empty snapshot
+  }
+  return cache.list();
+}