agent_servers: Fix panic when setting default mode (#42452)

Closes ZED-35A

Release Notes:

- Fixed an issue where Zed would panic when trying to set the default
mode for ACP agents
ee2e690657Bennet Bo Fenner committed on 11/11/2025, 3:25:27 PM· committed by GitHubparent28d019b
1 file changedLine totals unavailable