Add release-signing config plugin, README, memory of PWA parity

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -1,56 +1,61 @@
-# Welcome to your Expo app 👋
+# health-app
 
-This is an [Expo](https://expo.dev) project created with [`create-expo-app`](https://www.npmjs.com/package/create-expo-app).
+Cross-platform (iOS + Android) Expo app — native front end for the private
+health dashboard at **https://health.rehbock.xyz**.
 
-## Get started
+The app is a pure client: all data lives on the server and is fetched live over
+HTTPS with HTTP Basic auth. Nothing is stored on the device except the auth
+token (in the platform keychain via `expo-secure-store`).
 
-1. Install dependencies
+## Screens
 
-   ```bash
-   npm install
-   ```
+| Screen | Data source |
+| --- | --- |
+| Today | overview cards + clinical priorities (`health-meta.json`) |
+| Blood | `/api/health/v1/biomarkers` + `/draws` — search, flags, sparklines |
+| Sleep | `/api/health/v1/sleep` + `sleep-data.json` — stacked stage chart |
+| Train | `/api/health/v1/workouts` — weekly volume chart, expandable sessions |
+| Body | `dexa-scans.json` — DXA summary with deltas, regions, indices |
+| Mind | `/api/meditation/v1/stats` + `/sessions` |
+| DNA | `ancestry-traits.json` — 99 AncestryDNA traits |
 
-2. Start the app
+Ported from the PWA at `health.rehbock.xyz/app/`
+(repo `marcus/health.rehbock.xyz`, `app/index.html`); charts are
+react-native-svg, tap a bar for the night/week detail.
 
-   ```bash
-   npx expo start
-   ```
+## Development
 
-In the output, you'll find options to open the app in a
-
-- [development build](https://docs.expo.dev/develop/development-builds/introduction/)
-- [Android emulator](https://docs.expo.dev/workflow/android-studio-emulator/)
-- [iOS simulator](https://docs.expo.dev/workflow/ios-simulator/)
-- [Expo Go](https://expo.dev/go), a limited sandbox for trying out app development with Expo
-
-You can start developing by editing the files inside the **app** directory. This project uses [file-based routing](https://docs.expo.dev/router/introduction).
-
-## Get a fresh project
-
-When you're ready, run:
-
-```bash
-npm run reset-project
+```sh
+npm install
+npx expo start        # scan the QR with Expo Go (iOS or Android)
 ```
 
-This command will move the starter code to the **app-example** directory and create a blank **app** directory where you can start developing.
+Log in with the same Basic-auth credentials as the website.
 
-### Other setup steps
+## Android release APK
 
-- To set up ESLint for linting, run `npx expo lint`, or follow our guide on ["Using ESLint and Prettier"](https://docs.expo.dev/guides/using-eslint/)
-- If you'd like to set up unit testing, follow our guide on ["Unit Testing with Jest"](https://docs.expo.dev/develop/unit-testing/)
-- Learn more about the TypeScript setup in this template in our guide on ["Using TypeScript"](https://docs.expo.dev/guides/typescript/)
+Signing expects (auto-skipped if absent, falling back to the debug key):
 
-## Learn more
+- keystore `~/.android-keys/health-app-release.jks` (alias `health`), or `$HEALTH_KEYSTORE`
+- password in `~/.android-keys/health-app-release.password`, or `$KEYSTORE_PASSWORD`
 
-To learn more about developing your project with Expo, look at the following resources:
+The signing config is injected by `plugins/with-release-signing.js` at prebuild.
 
-- [Expo documentation](https://docs.expo.dev/): Learn fundamentals, or go into advanced topics with our [guides](https://docs.expo.dev/guides).
-- [Learn Expo tutorial](https://docs.expo.dev/tutorial/introduction/): Follow a step-by-step tutorial where you'll create a project that runs on Android, iOS, and the web.
+```sh
+npx expo prebuild --platform android
+cd android && ./gradlew assembleRelease
+# → android/app/build/outputs/apk/release/app-release.apk
+```
 
-## Join the community
+Install on GrapheneOS by copying the APK over (or via Obtainium once a
+Gitea release exists).
 
-Join our community of developers creating universal apps.
+## iOS
 
-- [Expo on GitHub](https://github.com/expo/expo): View our open source platform and contribute.
-- [Discord community](https://chat.expo.dev): Chat with Expo users and ask questions.
+No Mac is available in this setup, so there is no local iOS build. Options:
+
+- **Expo Go** (zero setup): `npx expo start`, scan the QR from the iPhone.
+- **EAS Build** (real install): `npx eas build -p ios` — needs an Apple
+  Developer account; produces a TestFlight/ad-hoc build in the cloud.
+
+The `ios.bundleIdentifier` is already set to `xyz.rehbock.health`.