AI agents are executing in production with no accountability. Yohaku is the verified execution OS for agent fleets. Every action passes through Yohaku before it touches the real world. Plan → Approve → Confirm → Receipt (signed, tamper-evident proof) Key features: • Approval Lanes (Auto / Review / Gate) • KYA: Know Your Agent • Evidence Pack • Freeze / Circuit Breaker • PROD Idempotency (no double execution) • Context Receipt Human optional. Accountability mandatory.