feat: add controlled codex thread rollback

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

@@ -1516,6 +1516,35 @@ test("codex app-server runner retries transient overloaded JSON-RPC requests", a
   }
 });
 
+test("codex app-server runner rolls back a thread without starting a new turn or leaking history", async () => {
+  const runnerConfig = getCodexAppServerRunnerConfig(process.env, {
+    codexAppServerEnabled: true,
+    codexAppServerCommand: process.execPath,
+    codexAppServerArgs: ["tests/fixtures/codex-app-server-runtime.mjs"],
+    codexAppServerWorkdir: repoRoot,
+    codexAppServerTimeoutMs: 5000,
+  });
+
+  const result = await executeCodexAppServerTask(runnerConfig, {
+    taskId: "task-thread-rollback",
+    taskType: "conversation_reply",
+    intentCategory: "thread_rollback",
+    targetCodexThreadRef: "019d-app-server-thread",
+    targetCodexFolderRef: repoRoot,
+    rollbackNumTurns: 2,
+    executionPrompt: "回滚最近 2 轮 Codex 线程历史。",
+  });
+
+  assert.equal(result.status, "completed");
+  assert.equal(result.threadId, "019d-app-server-thread");
+  assert.equal(result.turnControl, "rollback");
+  assert.equal(result.rollback?.numTurns, 2);
+  assert.match(result.replyBody, /已回滚 Codex 线程最近 2 轮/);
+  assert.match(result.replyBody, /不会自动还原本地文件变更/);
+  assert.doesNotMatch(result.replyBody, /private rollback turn text/);
+  assert.equal(result.turnId, undefined);
+});
+
 test("codex app-server runner stays disabled unless feature flag is explicit", () => {
   const runnerConfig = getCodexAppServerRunnerConfig(process.env, {
     codexAppServerCommand: process.execPath,