Add support for specifying maxSessionTurns via the settings configuration (#3507)

packages/cli/src/config/settings.ts

@@ -80,6 +80,9 @@ export interface Settings {
   hideWindowTitle?: boolean;
   hideTips?: boolean;
 
+  // Setting for setting maximum number of user/model/tool turns in a session.
+  maxSessionTurns?: number;
+
   // Add other settings here.
 }