CircleAI 2.7.0 — Server-farm tier
Four new packages: CircleAI.Inference.Server.Enterprise (multi-tenant routing + batch + sharding + RT-12 v2 cross-tier offload), CircleAI.Observability (OTel + Prometheus + Grafana), CircleAI.Operator (kagent k8s pattern), CircleAI.SDD (spec-kit pattern-port). All fail-safe Null impls. All 21 packages at 2.7.0. 12 new contract tests.
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