Migrating a large legacy test suite is not a code-generation problem. It is a confidence problem. An agent can translate an old test into modern syntax very quickly. The difficult question is whether it preserved the behavior-and how you can prove that across hundreds or thousands of tests without manually supervising every generated change. I built an agent harness to solve that problem. You point it at a specification, and it works through every test hands-free: it plans the work, writes...