Run a WP-CLI command against a space

Runs one wp command against the space's own WordPress and waits for it to finish. This is the escape hatch beneath the named surfaces: anything WP-CLI can do that Spacefast has not given its own route. args is an already-split argument vector (["option", "get", "blogname"]), relayed verbatim — no shell parses it, so nothing re-splits or re-globs what you send. Requires write access to the space, because a wp command has unrestricted authority over the site's data, and every run is written to the space's activity trail. Note that the provider runs this as a job and reports only whether WP-CLI exited zero: output is null because the runtime exposes no channel carrying the command's own stdout.