EAS Repack regenerates EXConstants.bundle/app.config without running config plugins. Any values added by config plugins (e.g. expo-router's origin) are missing at runtime.

Extracted from real builds (SDK 55, expo-router 55.0.7):

• evidence/fresh-build-extra-router.json — from a fresh EAS build, extra.router.origin is present
• evidence/repacked-build-extra-router.json — from a repacked build of the same app, extra.router is missing entirely

expo-router/head calls getHeadOriginFromConstants() which reads Constants.expoConfig.extra.router.origin. When missing, it calls throwOrAlert() which in production mode shows a native alert() dialog, blocking all UI. This breaks all automated e2e tests (Maestro, Detox, etc.) on repacked builds.