Pholio needs a way to resolve mocks. The easiest path here is just to allow closing of mocks like we can close tasks. It could be we add review later, but I haven't seen external need for that with Pholio in the past year, and I have seen (and want personally) the need to clean up / resolve / archive old mocks.
My suggestion would be:
Closed
Closed, Launched
Closed, Just an idea
Closed, Archived
I suppose these should be settable like Maniphest phases as well.