Discussed at https://macadmins.slack.com/archives/C0214NELAE7/p1769719765777279 - The endpoints for marking a device as unmanaged and sending an unmanage command were deprecated and no longer work. The endpoint for looking up a device by serial number was also deprecated, so I've proactively updated it. - The whole story is now refactored and simplified. - Also fixed a link in the `tines` README.