AI agents are probabilistic. Execution authority should not be. Avela separates model intelligence from control over live state. Models may reason, choose, fail, abstain, or propose unsafe actions. A deterministic Runtime decides what becomes real. Recorded autonomous evaluation: 199 Runtime attempts, 7/7 authority boundaries exercised, zero partial commits, zero integrity failures, 100% rollback success. The model proposes. The Runtime decides what becomes real.