feat: add controlled codex thread compaction

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

@@ -1545,6 +1545,34 @@ test("codex app-server runner rolls back a thread without starting a new turn or
   assert.equal(result.turnId, undefined);
 });
 
+test("codex app-server runner starts thread compaction without starting a normal 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-compact",
+    taskType: "conversation_reply",
+    intentCategory: "thread_compact",
+    targetCodexThreadRef: "019d-app-server-thread",
+    targetCodexFolderRef: repoRoot,
+    executionPrompt: "压缩当前 Codex 线程上下文。",
+  });
+
+  assert.equal(result.status, "completed");
+  assert.equal(result.threadId, "019d-app-server-thread");
+  assert.equal(result.turnControl, "compact");
+  assert.equal(result.compaction?.status, "completed");
+  assert.match(result.replyBody, /已发起 Codex 线程上下文压缩/);
+  assert.doesNotMatch(JSON.stringify(result), /context-compaction-secret-should-not-leak/);
+  assert.doesNotMatch(JSON.stringify(result), /private compaction summary should not leak/);
+  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,