When using /restart from a Telegram DM topic, the gateway restart notification fails because it doesn't include a reply anchor (message_id).
Error: Telegram DM topic delivery requires a reply anchor; refusing to send outside the requested topic
Logs:
2026-05-30 23:44:35,132 WARNING gateway.run: Restart notification to telegram:XXXXXXXX was not delivered: Telegram DM topic delivery requires a reply anchor; refusing to send outside the requested topic
2026-05-30 23:44:35,132 WARNING gateway.run: Home-channel startup notification failed for telegram:XXXXXXXX: Telegram DM topic delivery requires a reply anchor; refusing to send outside the requested topic
Root cause: In gateway/run.py line ~10274, _handle_restart_command saves platform, chat_id, and thread_id to .restart_notify.json, but does NOT save event.message_id.
When _send_restart_notification (line ~14796) sends the notification, it uses metadata = {"thread_id": thread_id} but has no reply_to_message_id to include. Telegram's Bot API requires a reply anchor for DM topic messages.