Normally, governance is a group activity. It could be an informal chat with a small enough team, or a more structured regular meeting with formal group membership for a larger scope. This is where I think the principles we covered earlier should be discussed and changed as required. This group needs to be led by a technologist, and to consist predominantly of people who are executing the work being governed. This group should also be responsible for tracking and managing technical risks.
@robert is rightly pushing for this and we should start this soon. we already have an extensive list of topics to cover!
recommendation here is that an architect make sure the mechanics of the group work, but the group as a whole is responsible for governance.

