Fix agent task registration clippy

Author: adrian-openai

codex-rs/core/src/agent_identity/task_registration.rs

@@ -396,7 +396,7 @@ mod tests {
         let key_material = generate_agent_key_material().expect("key material");
         let binding = AgentIdentityBinding::from_auth(auth, None).expect("binding");
         let stored_identity = StoredAgentIdentity {
-            binding_id: binding.binding_id.clone(),
+            binding_id: binding.binding_id,
             chatgpt_account_id: account_id.to_string(),
             chatgpt_user_id: Some("user-123".to_string()),
             agent_runtime_id: agent_runtime_id.to_string(),