Contracts have been mentioned first long time ago, when the skill system/progression was introduced together with objectives and features.
I thought the idea disappeared somewhere in the black hole of forgotten features.
It’s good to hear about it. If it’s still being talked about by devs at least we know it can arrive at some stage. It doesn’t bother me in what shape first - I’m sure it can become something good as it’s worked on and tested.
P.S. Found it!! Sure the idea there might be different to what it becomes eventually: