Update agent rules and build conventions

AGENTS.md

@@ -1,3 +1,27 @@
 # Expo HAS CHANGED
 
 Read the exact versioned docs at https://docs.expo.dev/versions/v56.0.0/ before writing any code.
+
+# Versioning & Build Rules
+Whenever a new build is triggered, the version MUST be updated.
+- `version` format: `23.01.X`
+- `versionCode`: `X` (just the last number)
+Examples:
+- version `23.01.1` -> versionCode `1`
+- version `23.01.3` -> versionCode `3`
+- version `23.01.123` -> versionCode `123`
+
+Apps must always be built as BOTH `.apk` and `.aab`.
+The exact naming syntax for compiled files is:
+`Schnappix_v23.01.X.apk`
+`Schnappix_v23.01.X.aab`
+
+# Architectural Decisions & Project Rules
+1. **Kiosk Mode (Device Owner)**
+   - The app uses Custom Native Modules (Kotlin) for LockTask mode. It does NOT use external MDM software.
+   - For LockTask to work, the app MUST be set as Device Owner via ADB (`adb shell dpm set-device-owner de.orfel.schnappix/de.orfel.schnappix.KioskDeviceAdminReceiver`).
+2. **Photo Saving (Permissions)**
+   - Uses modern Android MediaStore API (`writeOnly = true` via expo-media-library) to save photos directly to `Schnappix - <EventName> - Collagen` and `Schnappix - <EventName> - Originale`.
+   - Do NOT attempt to force legacy `WRITE_EXTERNAL_STORAGE` or `READ_EXTERNAL_STORAGE` on Android 13+, as it will fail.
+3. **Package Name**
+   - Must strictly remain `de.orfel.schnappix`.