Investigate Systematic debugging skill that enforces the Iron Law: never fix without a confirmed root cause. Produces a structured debug report with full evidence chain, minimal fix, and regression test. Iron Law Principle No fix without confirmed root cause. Every investigation follows a strict evidence chain: 1. Reproduce the bug with concrete evidence 2. Analyze patterns to assess scope 3. Form and test hypotheses (max 3 strikes) 4. Implement minimal fix ONLY after root cause is confirmed 5. Verify fix and generate structured report Violation of the Iron Law (skipping to Phase 4 without Ph…