#[CliSubcommand]
Attribute on methods, repeatable.
Registers a public method of a #[CliCommand] service as a WP-CLI command,
wp {namespace} {command} {name}. The method returns void.
A parameter typed CliOutput receives the output, parameters typed with a
service candidate are injected, all others are marked #[Argument]
(positional argument) or #[Option] (option, a flag for bool).
The description is the one-line summary in wp help (at most 80
characters); the long description follows the options in the help, e.g. an
## EXAMPLES section.