[all][dev] Where are cross-repository blueprints and specs located?

Hi all, I have two general developer questions: * Where are the blueprints and specs located that address changes across the code base? * How to deal with changes that have dependencies on multiple repositories (where a specific merge and release order needs to be satisfied)? For example: An enumeration member has to be added and merged in repository A before it can be used in repository B and C. If this order is not satisfied, a DevStack setup may break. Regards, Manuel