Minimal SMS helper app for local testing

This small Android app exposes an Activity that sends an SMS using SmsManager.

Usage
1. Build the app (Android Studio or Gradle):
   ./gradlew assembleDebug

2. Install on device:
   adb install -r app/build/outputs/apk/debug/app-debug.apk

3. Grant SEND_SMS permission for testing:
   adb shell pm grant com.example.smshelper android.permission.SEND_SMS

4. Send an SMS via the helper activity:
   adb shell am start -n com.example.smshelper/.SendActivity --es to "79079" --es body "2601#AUN#2.25#1"

Notes
- Use only on a test device. Uninstall after testing with:
  adb uninstall com.example.smshelper

Quick test (PowerShell example):
& 'C:\android\platform-tools\adb.exe' shell am start -n com.example.smshelper/.SendActivity --es to "79079" --es body "2601#AUN#2.25#1"

