[hallmark]

I appreciate the massive amount of work and the recent updates to tighten the spec.

One challenge with the churn is a lack of any high-level changelog (git commit history doesn't count). I have a team working off an earlier version of the spec, and I check back semi-frequently. But I haven't been able to find a document outlining "here are the major changes since the previous versions." I understand that would represent more work on top of work, but for such a large spec, the changes have been disorienting.