Update to new agent schema (#35578)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/agent_servers/Cargo.toml

@@ -25,6 +25,7 @@ collections.workspace = true
 context_server.workspace = true
 futures.workspace = true
 gpui.workspace = true
+indoc.workspace = true
 itertools.workspace = true
 log.workspace = true
 paths.workspace = true
@@ -37,11 +38,11 @@ settings.workspace = true
 smol.workspace = true
 strum.workspace = true
 tempfile.workspace = true
+thiserror.workspace = true
 ui.workspace = true
 util.workspace = true
 uuid.workspace = true
 watch.workspace = true
-indoc.workspace = true
 which.workspace = true
 workspace-hack.workspace = true