/**
 * Send a push notification via ntfy.
 */
export async function notify(message, title = 'Kalbot', priority = 'default', tags = 'robot') {
  const url = process.env.NTFY_URL;
  if (!url) return;

  try {
    await fetch(url, {
      method: 'POST',
      body: message,
      headers: {
        'Title': title,
        'Priority': priority,
        'Tags': tags
      }
    });
  } catch (e) {
    console.error('[Notify] Error:', e.message);
  }
}