fix: 避免 Codex 默认模型覆盖配置

src/selftest/fake-codex-app-server.ts

@@ -4,6 +4,7 @@ const rl = readline.createInterface({ input: process.stdin, crlfDelay: Infinity
 const mode = process.env.AGENTRUN_FAKE_CODEX_MODE ?? "success";
 let threadCounter = 0;
 let turnCounter = 0;
+let observedThreadModel = false;
 
 for await (const line of rl) {
   const trimmed = String(line).trim();
@@ -18,6 +19,15 @@ for await (const line of rl) {
     continue;
   }
   if (message.method === "thread/start") {
+    observedThreadModel = Object.hasOwn(message.params ?? {}, "model");
+    if (mode === "reject-unexpected-model" && observedThreadModel) {
+      respond(message.id, null, { code: -32000, message: "thread/start unexpectedly included model" });
+      continue;
+    }
+    if (mode === "require-explicit-model" && message.params?.model !== "gpt-5.5") {
+      respond(message.id, null, { code: -32000, message: "thread/start did not include expected model" });
+      continue;
+    }
     threadCounter += 1;
     const thread = { id: `thread_selftest_${threadCounter}` };
     notify("thread/started", { thread });
@@ -25,12 +35,29 @@ for await (const line of rl) {
     continue;
   }
   if (message.method === "thread/resume") {
+    observedThreadModel = Object.hasOwn(message.params ?? {}, "model");
+    if (mode === "reject-unexpected-model" && observedThreadModel) {
+      respond(message.id, null, { code: -32000, message: "thread/resume unexpectedly included model" });
+      continue;
+    }
+    if (mode === "require-explicit-model" && message.params?.model !== "gpt-5.5") {
+      respond(message.id, null, { code: -32000, message: "thread/resume did not include expected model" });
+      continue;
+    }
     const thread = { id: String(message.params?.threadId ?? "thread_selftest_resumed") };
     notify("thread/started", { thread });
     respond(message.id, { thread });
     continue;
   }
   if (message.method === "turn/start") {
+    if (mode === "reject-unexpected-model" && (observedThreadModel || Object.hasOwn(message.params ?? {}, "model"))) {
+      respond(message.id, null, { code: -32000, message: "turn/start unexpectedly included model" });
+      continue;
+    }
+    if (mode === "require-explicit-model" && message.params?.model !== "gpt-5.5") {
+      respond(message.id, null, { code: -32000, message: "turn/start did not include expected model" });
+      continue;
+    }
     if (mode === "missing-turn-result") {
       respond(message.id, {});
       continue;