It has automatic reconnect: "-o reconnect". You'll need to use key-based authentication with an SSH agent, since it won't be able to prompt you for the password while running in the background.
Hey that's awesome thaks! Seems to have been there for decades. How could I miss this?
That might mean it needs better surfacing in the docs, if you have the time it may be worth having a quick look at the docs - it's possible a PR could help aid discoverability.
That seems impossible until a new maintainer is found. The current issue tracker however contains an issue that suggests making automatic reconnects the default. I hope I remember this when eventually (hopefully) this project is picked up by someone else.