Add a domain to the signed-in user's DNS Doctor monitoring and return the ownership-check TXT record they must publish, plus where their DNS is hosted, a provider-specific guide link and, when their provider supports it, a one-click apply URL. Re-adding a domain they already monitor returns that domain rather than an error. Needs a linked DNS Doctor account: until the human has one, or if the host's connect prompt fails, use start_monitoring_signup and print its link instead. Print every record host and value EXACTLY as returned — never rewrite, reformat or improve a record string. Nothing here is applied to anyone's DNS: a human publishes every record, and you must show them what you are about to add and get their approval before using any DNS tool of your own.