agent_servers: Include result text in Claude error messages (#35156)

This will better surfaces issues that are classified as "success" but
actually have a more meaningful error message attached.

Release Notes:

- N/A
c995d45bd9Ben Brandt committed on 7/27/2025, 1:58:02 PM· committed by GitHubparenta5b7cfd
1 file changedLine totals unavailable