fix(cli): lazily load settings in onModelChange to prevent stale closure data loss (google-gemini#20403)

Co-authored-by: Spencer <spencertang@google.com>

Author: KumarADITHYA123

packages/cli/src/config/config.ts

@@ -430,8 +430,6 @@ export async function loadCliConfig(
   const { cwd = process.cwd(), projectHooks } = options;
   const debugMode = isDebugMode(argv);
 
-  const loadedSettings = loadSettings(cwd);
-
   if (argv.sandbox) {
     process.env['GEMINI_SANDBOX'] = 'true';
   }
@@ -886,7 +884,7 @@ export async function loadCliConfig(
     hooks: settings.hooks || {},
     disabledHooks: settings.hooksConfig?.disabled || [],
     projectHooks: projectHooks || {},
-    onModelChange: (model: string) => saveModelChange(loadedSettings, model),
+    onModelChange: (model: string) => saveModelChange(loadSettings(cwd), model),
     onReload: async () => {
       const refreshedSettings = loadSettings(cwd);
       return {