feat(plan): support automatic model switching for Plan Mode (#20240)

packages/cli/src/config/settingsSchema.ts

@@ -285,6 +285,16 @@ const SETTINGS_SCHEMA = {
               'The directory where planning artifacts are stored. If not specified, defaults to the system temporary directory.',
             showInDialog: true,
           },
+          modelRouting: {
+            type: 'boolean',
+            label: 'Plan Model Routing',
+            category: 'General',
+            requiresRestart: false,
+            default: true,
+            description:
+              'Automatically switch between Pro and Flash models based on Plan Mode status. Uses Pro for the planning phase and Flash for the implementation phase.',
+            showInDialog: true,
+          },
         },
       },
       retryFetchErrors: {