fix(test): revert atlas test to use uiSelectedModel

Revert test name and assertion to original behavior per PR review feedback.

The test now correctly expects Atlas to respect uiSelectedModel instead of using its own fallback chain.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/agents/utils.test.ts

@@ -51,7 +51,7 @@ describe("createBuiltinAgents with model overrides", () => {
     expect(agents.sisyphus.thinking).toBeUndefined()
   })
 
-  test("Atlas does not use uiSelectedModel (respects its own fallback chain)", async () => {
+  test("Atlas uses uiSelectedModel", async () => {
     // #given
     const fetchSpy = spyOn(shared, "fetchAvailableModels").mockResolvedValue(
       new Set(["openai/gpt-5.2", "anthropic/claude-sonnet-4-6"])
@@ -75,7 +75,7 @@ describe("createBuiltinAgents with model overrides", () => {
 
       // #then
       expect(agents.atlas).toBeDefined()
-      expect(agents.atlas.model).toBe("anthropic/claude-sonnet-4-5")
+      expect(agents.atlas.model).toBe("openai/gpt-5.2")
     } finally {
       fetchSpy.mockRestore()
     }