Sorry but I think you’re requirement that something only be “the art” if any arbitrary person can critique it is off. The frontier labs are working on the state of the art but it’s just art that you aren’t allowed to see. Unfortunately.
the art is the standard engineering practices that go into building the thing
its things you would be trained in as part of a bachelor's degree and some graduate coursework
It is work using the principles of the art, obviously.
But "state of the art" implies the highest state of general availability, not just in terms of access to some product, but of use of the ideas, concepts, methodologies etc.
Anthropic and OpenAI have "cutting edge" models; the state of the art is behind the cutting edge.
The state of the art is the best open source, open weights model available. More or less by definition.
I am probably tilting at windmills here.