scripts/notify_telegram.sh sends a file (e.g. the debug APK) to a
Telegram chat via Bot API sendDocument. Reads TELEGRAM_BOT_TOKEN and
TELEGRAM_CHAT_ID from .telegram.env (gitignored, real credentials
never committed) or the environment. Verified end-to-end: sent the
current debug APK and confirmed delivery.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
