EAS 4 KiB limit forces workaround for Expo multi-environment configs

Expo's EAS build service caps file-type environment variables at 4 KiB, breaking apps that use large config files like Amplify's amplify_outputs.json. A developer solved this by committing separate output files per environment and using an eas-build-pre-install hook to copy the correct one. The workaround is essential for mobile apps that must bake backend configuration into builds at commit time.