概要
Apply a state-of-the-art, five-phase procedure for fixing bugs that prioritizes experimental reproduction and comprehensive test coverage. This skill guides the transition from understanding a bug's impact to proving its existence through filesystem-based experimentation and failing tests at multiple abstraction levels. By enforcing a 'drill-down' approach—starting with user-visible symptoms and moving to root-cause unit tests—it ensures that fixes are minimal, effective, and free of debugging artifacts, leading to professional-grade commit hygiene.