4-2 Zero Friction Testing Hands-On

In the last lecture we ran the diagnosis — we figured out what was wrong, we built a priority matrix, we identified the files that need the most attention. Now we actually do something about it. This lecture is the technical heart of Module 4. We are going to talk about how to use AI to drive real refactoring — not toy examples, but the kind of structured, careful, incremental refactoring that you can defend to a tech lead, apply in a production codebase, and feel good about the next morning. There are a few techniques in here that I think are genuinely going to change how you approach this kind of work, so let us get into it.