The policy, or null when the run recorded none: a verdict from before routing was calibrated.
The thread Likelihood's Platt calibration for the model that answered, or null when that exact model has none, and routing keeps continuity.
DECISION_ROUTING_MIN_CONFIDENCE.
DECISION_ROUTING_TIMEOUT_MS: past it, production keeps continuity.
A run's recorded routing verdict, and the policy it was reached under.