I'm also curious about what a process engineering abstraction layer looks like. Though the final section does hint at it; more integration of more stakeholders closer to the construction of code.

Though I have to push back on the idea of "code as truth". Thinking about all the layers of abstraction and indirection....hasn't data and the database layer typically been the source of truth?

Maybe I'm missing something in this iteration of the industry where code becomes something other than what it's always been: an intermediary between business and data.