test(models): add tests for baseUrl and api inheritance

Add test cases to verify:
- baseUrl is inherited from provider when model does not specify it
- api is inherited from provider when model does not specify it
- model-level api takes precedence over provider-level api
- both baseUrl and api can be inherited together

Co-Authored-By: Claude (claude-opus-4.5) <noreply@anthropic.com>

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

@@ -22,8 +22,70 @@ describe("buildInlineProviderModels", () => {
     const result = buildInlineProviderModels(providers);
 
     expect(result).toEqual([
-      { ...makeModel("alpha-model"), provider: "alpha" },
-      { ...makeModel("beta-model"), provider: "beta" },
+      { ...makeModel("alpha-model"), provider: "alpha", baseUrl: undefined, api: undefined },
+      { ...makeModel("beta-model"), provider: "beta", baseUrl: undefined, api: undefined },
     ]);
   });
+
+  it("inherits baseUrl from provider when model does not specify it", () => {
+    const providers = {
+      custom: {
+        baseUrl: "http://localhost:8000",
+        models: [makeModel("custom-model")],
+      },
+    };
+
+    const result = buildInlineProviderModels(providers);
+
+    expect(result).toHaveLength(1);
+    expect(result[0].baseUrl).toBe("http://localhost:8000");
+  });
+
+  it("inherits api from provider when model does not specify it", () => {
+    const providers = {
+      custom: {
+        api: "anthropic-messages",
+        models: [makeModel("custom-model")],
+      },
+    };
+
+    const result = buildInlineProviderModels(providers);
+
+    expect(result).toHaveLength(1);
+    expect(result[0].api).toBe("anthropic-messages");
+  });
+
+  it("model-level api takes precedence over provider-level api", () => {
+    const providers = {
+      custom: {
+        api: "openai-chat",
+        models: [{ ...makeModel("custom-model"), api: "anthropic-messages" as const }],
+      },
+    };
+
+    const result = buildInlineProviderModels(providers);
+
+    expect(result).toHaveLength(1);
+    expect(result[0].api).toBe("anthropic-messages");
+  });
+
+  it("inherits both baseUrl and api from provider config", () => {
+    const providers = {
+      custom: {
+        baseUrl: "http://localhost:10000",
+        api: "anthropic-messages",
+        models: [makeModel("claude-opus-4.5")],
+      },
+    };
+
+    const result = buildInlineProviderModels(providers);
+
+    expect(result).toHaveLength(1);
+    expect(result[0]).toMatchObject({
+      provider: "custom",
+      baseUrl: "http://localhost:10000",
+      api: "anthropic-messages",
+      name: "claude-opus-4.5",
+    });
+  });
 });