保留原生浏览器探针失败阶段与清理证据（09-06-release-gate-integrity）

scripts/qa/tests/full-local-environment.test.mjs

@@ -43,6 +43,26 @@ test("环境回执必须消费事实而非 valid 标记", () => {
   }
 });
 
+test("两引擎逐项必需：诊断记录不构成失败引擎的豁免", () => {
+  for (const index of [0, 1]) {
+    for (const mutate of [
+      engine => { engine.valid = false; engine.failureStage = "launch"; engine.failures = [{ stage: "launch", errorKind: "browser_process_closed" }]; },
+      engine => { engine.online = false; },
+      engine => { engine.browserNamespace = "other"; },
+      engine => { engine.browserMatchesOwnedChild = false; },
+      engine => { engine.noNavigatorOverride = false; },
+      engine => { delete engine.version; },
+    ]) {
+      const value = receipt(); mutate(value.nativeOnlineProbe.engines[index]);
+      assert.ok(validateEnvironmentReceipt(value, "policy").includes("native_engine_probe_invalid"));
+    }
+  }
+  for (const engines of [[], [receipt().nativeOnlineProbe.engines[0]], receipt().nativeOnlineProbe.engines.toReversed()]) {
+    const value = receipt(); value.nativeOnlineProbe.engines = engines;
+    assert.ok(validateEnvironmentReceipt(value, "policy").includes("native_engine_probe_invalid"));
+  }
+});
+
 test("父 runner 实时 IPC 绑定本轮、进程和当前策略，错误响应拒绝", async context => {
   const scratch = mkdtempSync(path.join(os.tmpdir(), "hyb-env-ipc-test-"));
   const owner = { scratch, runId: "current", supervisorPid: process.pid, policyDigest: "policy" };