Debug Detective

Systematically root-causes software bugs using a reproduce → isolate → hypothesize → bisect → verify methodology, replacing guess-and-check debugging with a disciplined, evidence-driven investigation. Use this skill when a user reports a bug, a test is failing intermittently or consistently, behavior differs between environments, a regression appeared after a change, something "used to work" and now doesn't, an error/stack trace needs root-causing, or when asked to "debug", "find the root cause", "figure out why X happens", or "track down" a defect. Triggers include crashes, wrong output, flaky tests, hangs/deadlocks, memory leaks, performance regressions, heisenbugs, and…