feat: add controlled codex thread rollback

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

@@ -62,6 +62,15 @@ function resolvePrompt(task) {
   return String(task?.executionPrompt || task?.requestText || "").trim();
 }
 
+function isThreadRollbackTask(task) {
+  return task?.intentCategory === "thread_rollback" || task?.taskType === "thread_rollback";
+}
+
+function resolveRollbackNumTurns(task) {
+  const numeric = Number(task?.rollbackNumTurns ?? 1);
+  return Number.isFinite(numeric) && numeric >= 1 ? Math.floor(numeric) : undefined;
+}
+
 function normalizeTimeoutMs(value) {
   const numeric = Number(value);
   return Number.isFinite(numeric) && numeric > 0 ? Math.floor(numeric) : 120_000;
@@ -3088,6 +3097,28 @@ export async function executeCodexAppServerTask(runnerConfig, task) {
     if (!threadId) {
       throw new Error("CODEX_APP_SERVER_THREAD_ID_MISSING");
     }
+
+    if (isThreadRollbackTask(task)) {
+      const numTurns = resolveRollbackNumTurns(task);
+      if (!numTurns) {
+        throw new Error("CODEX_APP_SERVER_ROLLBACK_NUM_TURNS_INVALID");
+      }
+      await request("thread/rollback", { threadId, numTurns });
+      return {
+        status: "completed",
+        replyBody: `已回滚 Codex 线程最近 ${numTurns} 轮。注意：这只回滚线程历史，不会自动还原本地文件变更。`,
+        threadId,
+        turnControl: "rollback",
+        rollback: {
+          numTurns,
+        },
+        cwd,
+        transport: runnerConfig.transport,
+        executionProgress: progressCollector.snapshot(),
+        canFallbackToCli: false,
+      };
+    }
+
     const interThreadBroker = await maybeInjectInterThreadContext({
       request,
       task,