Expo App Foundations

A shipped binary lives for months and cannot be patched quickly. Build the app so most incidents are handled remotely, and test the paths a simulator in the foreground never exercises: cold starts, killed apps, signed-out users, and flaky networks.

For Expo's own APIs (EAS Update, SDK upgrades, Expo Router, data fetching), load Expo's official skills when available; this skill covers the foundation decisions they leave to the app.

Separate environments from channels