It can be helpful to take a page out of gamedev / film production worlds, and create a knowledge base or "bible" as global source of truth. But again, this is a centralized solution that does not really scale well as stakeholders multiply.

More importantly I believe is in having consensus on who plays the role of "director". Having a single voice that is universally acknowledged as the final say. A Mycroft Holmes type character so to speak. Creating the digital equivalent of a data curator and strategizer may be worth pursuing.