Pidge v3 Rules

• Use pidge v3 async API: NotificationClient with async with context manager and await client.dispatch(msg)
• Do NOT use v2 API: Notifier, NotifierConfig, or .send() are removed in v3
• Construct messages with Message dataclass, not positional arguments
• Config via NotificationConfig(api_key=...) — never hardcode API keys
• Always check result.status == Status.SENT for delivery confirmation
• Include notification_sent field in endpoint responses when sending notifications