fix(cli): not show update avaialble messages when running gemini-cli locally (#4052)

packages/cli/src/ui/utils/updateCheck.ts

@@ -10,6 +10,11 @@ import { getPackageJson } from '../../utils/package.js';
 
 export async function checkForUpdates(): Promise<string | null> {
   try {
+    // Skip update check when running from source (development mode)
+    if (process.env.DEV === 'true') {
+      return null;
+    }
+
     const packageJson = await getPackageJson();
     if (!packageJson || !packageJson.name || !packageJson.version) {
       return null;