Integrate master agent runtime orchestration updates

tests/local-agent-codex-task-runner.test.mjs

@@ -169,6 +169,38 @@ test("master agent reply without target thread stays on ephemeral exec", () => {
   ]);
 });
 
+test("task execution model overrides local-agent default model", () => {
+  const execution = buildCodexTaskExecution(
+    {
+      masterAgentWorkdir: "/Users/kris/code/boss",
+      masterAgentSandbox: "workspace-write",
+      masterAgentModel: "gpt-5.4-mini",
+    },
+    {
+      taskType: "group_dispatch_plan",
+      executionPrompt: "请生成群聊分发方案",
+      executionModel: "gpt-5.4",
+    },
+    "/tmp/master.txt",
+  );
+
+  assert.equal(execution.mode, "ephemeral");
+  assert.deepEqual(execution.args, [
+    "exec",
+    "--ephemeral",
+    "--skip-git-repo-check",
+    "-C",
+    "/Users/kris/code/boss",
+    "-s",
+    "workspace-write",
+    "-o",
+    "/tmp/master.txt",
+    "-m",
+    "gpt-5.4",
+    "请生成群聊分发方案",
+  ]);
+});
+
 test("conversation reply preflight fails closed when target cwd is missing", async () => {
   const missingFolder = "/tmp/boss-local-agent-missing-workdir";
   const stateDbPath = await createCodexStateDb([