Architecture A2: Test models are available

Update 2026-02-12: The test models have been updated to "v4" to fix some identified issues. Please re-download the latest if you haven't begun testing. If you've already sent me results, don't worry about it--I'll note the discrepancies and account for them. The core repo has also been updated to v0.4.0.rc3 Progress is coming along on work to develop Architecture A2 , NAM's update to the "standard…