This skill should be used when the user says "stress interview", "synthetic interview", "user interview stress test", "interview my personas", "test with synthetic users", "persona interview", "simulate user interviews", "run user interviews", or wants to stress-test a product concept by conducting structured interviews with synthetic personas through three adversarial lenses (Pragmatist, Skeptic, Power User). Produces an interview report with per-persona findings, synthesized themes, and recommended concept updates.