This skill should be used when the user says "solve problem", "solve this problem", or invokes /solve-problem. Applies a methodical, evidence-first approach to diagnosing a problem - understand intent, observe the problem first-hand, form multiple hypotheses, gather discriminating evidence to eliminate them, propose an evidenced solution, and verify the fix actually resolves the original symptom. Do NOT use for general how-to questions, explanations, or building new features.