feat: expose codex app-server protocol drift summary

tests/local-agent-codex-app-server-runner.test.mjs

@@ -139,6 +139,17 @@ test("codex app-server discovery includes governance and MCP summaries without l
     userInitiatedOnly: true,
     labels: ["源线程读取", "上下文注入", "目标线程执行", "协作事件"],
   });
+  assert.deepEqual(metadata.protocolDriftSummary, {
+    driftLevel: "compatible",
+    compatibilityMode: "runtime-probe",
+    failedProbeCount: 0,
+    runtimeFailureMethods: [],
+    docFollowupCount: 3,
+    docFollowupItems: ["collaborationMode/list", "thread/turns/list", "ThreadItem.collabToolCall"],
+    fallbackStrategy: "Boss Broker + App Server 注入/执行",
+    userInitiatedOnly: true,
+    labels: ["运行时探测", "官方文档跟进", "Boss Broker 兜底"],
+  });
   assert.deepEqual(metadata.pluginGovernanceSummary, {
     actionCount: 9,
     lifecycleActionCount: 2,