refactor(test): dedupe agent and discord test fixtures

src/agents/pi-embedded-runner/model.test.ts

@@ -8,9 +8,10 @@ vi.mock("../pi-model-discovery.js", () => ({
 import type { OpenClawConfig } from "../../config/config.js";
 import { buildInlineProviderModels, resolveModel } from "./model.js";
 import {
+  buildOpenAICodexForwardCompatExpectation,
   makeModel,
   mockDiscoveredModel,
-  OPENAI_CODEX_TEMPLATE_MODEL,
+  mockOpenAICodexTemplateModel,
   resetMockDiscoverModels,
 } from "./model.test-harness.js";
 
@@ -171,24 +172,12 @@ describe("resolveModel", () => {
   });
 
   it("builds an openai-codex fallback for gpt-5.3-codex", () => {
-    mockDiscoveredModel({
-      provider: "openai-codex",
-      modelId: "gpt-5.2-codex",
-      templateModel: OPENAI_CODEX_TEMPLATE_MODEL,
-    });
+    mockOpenAICodexTemplateModel();
 
     const result = resolveModel("openai-codex", "gpt-5.3-codex", "/tmp/agent");
 
     expect(result.error).toBeUndefined();
-    expect(result.model).toMatchObject({
-      provider: "openai-codex",
-      id: "gpt-5.3-codex",
-      api: "openai-codex-responses",
-      baseUrl: "https://chatgpt.com/backend-api",
-      reasoning: true,
-      contextWindow: 272000,
-      maxTokens: 128000,
-    });
+    expect(result.model).toMatchObject(buildOpenAICodexForwardCompatExpectation("gpt-5.3-codex"));
   });
 
   it("builds an anthropic forward-compat fallback for claude-opus-4-6", () => {