agent_servers: Let Gemini CLI know it is running in Zed (#38058)

By passing through Zed as the surface, Gemini can know which editor it
is running in.

Release Notes:

- N/A
4d54ccf494Ben Brandt committed on 9/15/2025, 8:30:46 AM· committed by GitHubparent5b1c87b
1 file changedLine totals unavailable