Single best model to use right now (signed routing decision)

The signed model-routing decision. For ?task=code|reasoning|creative|general or ?model=<id-or-name>, returns the single best model to use right now, fusing pricing, contamination-discounted benchmark capability, real production usage, measured p95 latency probes, and live incident-triage operational state, plus runners-up and an AFTA-signed receipt over the inputs. 30-minute operational freshness SLA, no-charge when the live layer is stale.