feat: expose codex stream delta events

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

@@ -253,6 +253,15 @@ test("codex app-server discovery includes governance and MCP summaries without l
     notificationOnly: true,
     labels: ["线程启动", "线程关闭", "已归档", "已恢复", "改名完成"],
   });
+  assert.deepEqual(metadata.streamDeltaEventSummary, {
+    eventCount: 9,
+    reasoningDeltaEventCount: 3,
+    commandStreamEventCount: 2,
+    toolProgressEventAvailable: true,
+    fileChangeOutputEventAvailable: true,
+    notificationOnly: true,
+    labels: ["Agent 增量", "计划增量", "思考新增", "思考文本", "原始思考", "MCP 进度", "命令输出", "终端交互", "文件输出"],
+  });
 
   const serialized = JSON.stringify(metadata);
   assert.equal(serialized.includes("sk-secret-should-not-leak"), false);