Agent Skills: refutation

Verify a finished artifact by dispatching an independent skeptic that never saw it being made, tasked with refuting it, grounding every factual claim in a primary source, and reporting findings with severity and confidence. Invoke before handing over any deliverable that has no automatic falsifier — documents, rules, guidelines, skills, plans, analyses, decisions — above all one produced in the current session. Code already covered by tests, typecheck, or lint has a falsifier; use it there only for claims those checks do not exercise. Not for wording, style, or "does this look OK" passes.