Regression Testing

This handles the classic regression testing problem: you change one thing and need to know what might break without running your entire test suite for an hour. It analyzes git diffs to select affected tests, prioritizes by risk, and helps you set up tiered strategies like smoke tests on every commit and full suites nightly. The agents can generate regression tests from production bugs automatically, which is genuinely useful. The main insight here is smart selection catching 90% of regressions in 10% of the time. Watch out for transitive dependencies though, a model change three layers deep can still break a controller test that won't show up in naive diff analysis.