Cognitive Airlock OS stops LLM hallucinations in financial workflows. Probabilistic AI agents shouldn't execute state directly. Airlock enforces 0% LLM authority using deterministic TypeScript guardrails: • Surcharges unbilled scope creep ($60/hr) • Hard budget kill-switch ($5K cap) • Automatic PII & API secret quarantine • SHA-256 state seal + Webhook dispatch receipts Open-source, local-first cockpit built with Next.js 15.