test(plugin-interface): fix Atlas display name expectation

- Update expected value to match actual output after ZWSP prefix stripping

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

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

src/plugin-interface.test.ts

@@ -165,7 +165,7 @@ describe("createPluginInterface - command.execute.before", () => {
     )
 
     // then
-    expect(output.message.agent).toBe(getAgentListDisplayName("atlas"))
+    expect(output.message.agent).toBe("Atlas - Plan Executor")
     expect(getSessionAgent("ses-command-atlas")).toBe("atlas")
     expect(readBoulderState(testDir)?.agent).toBe("atlas")
   })