fix(cli): preserve CJK agent header text

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

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

src/shared/agent-display-names.test.ts

@@ -133,6 +133,12 @@ describe("getAgentDisplayName", () => {
     // then returns "multimodal-looker"
     expect(result).toBe("multimodal-looker")
   })
+
+  it("preserves CJK display-name overrides verbatim", () => {
+    expect(getAgentDisplayName("sisyphus", { sisyphus: { displayName: "Sisyphus - 主脑" } })).toBe("Sisyphus - 主脑")
+    expect(getAgentDisplayName("hephaestus", { hephaestus: { displayName: "헤파이스토스" } })).toBe("헤파이스토스")
+    expect(getAgentDisplayName("atlas", { atlas: { displayName: "アトラス" } })).toBe("アトラス")
+  })
 })
 
 describe("getAgentConfigKey", () => {