The shipped default named one private, internet-unreachable host, so an
unconfigured install failed against a server it could never reach rather
than saying what to set.
- drop the registry default and make the option required
- reject a non-string, empty, or non-http(s) registry with the option name
and how to set it
- ask for a registry only when a run has to resolve one, so clean, list,
and specs with an explicit url keep working without it
An unparseable entry dropped out of the wanted set, so clean deleted the
directory and lock entry of a plugin the user still has configured.
Add tests/init_spec.lua covering setup, sync, clean and list.
unkin-agent