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apps/mobile/README.md

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+# @chat-app/mobile
+
+Expo + React Native client for iOS and Android.
+
+## Prerequisites
+
+- Node 22+, pnpm 9+
+- Xcode (iOS) / Android Studio (Android)
+- Optional: `npm i -g eas-cli` for cloud builds
+
+## Dev
+
+```bash
+# from repo root
+pnpm install
+pnpm mobile:dev       # expo start
+pnpm mobile:ios       # native iOS run
+pnpm mobile:android   # native Android run
+```
+
+## Notes
+
+- Uses Expo Router (file-based). Screens live under `app/`.
+- Secrets stored via `expo-secure-store` (Keychain / Keystore).
+- Local encrypted history via `expo-sqlite`.
+- Crypto via `react-native-libsodium`.
+- Shared business logic lives in `@chat-app/shared`.