Adversarially challenges a proposed plan, code change, or bug diagnosis from a hostile pre-mortem perspective. Walks a fixed taxonomy of failure modes, blast radius, rollback, hidden coupling, and maintainability; every finding must cite a file, line, or named assumption; forces a steelman of at least one alternative. Surfaces concerns only — does not score (delegates to `/confidence`) and does not apply fixes. Use during planning before autonomous execution, before opening a high-stakes PR, or when a fix "feels off". One adversarial pass per run — naïve self-refine loops amplify bias. Modes: plan (default), code, analysis; add `deep` to run 3–5 independent persona lenses in parallel (sub-agents when available, personas found via `ideate`) and merge them — e.g. at the end of a feature. Triggers on "critical", "challenge this", "pre-mortem", "red-team this", "deep critical review", "review from every angle", "/critical".