Environment Topology: Per-Environment Registrations, Deliberate Promotion

Model registrations live inside each environment, not in one shared global list — promotion between them is an explicit step, never automatic.
DEV Model registrations (dev) Agent configs (dev) Budget allocation (dev) STAGING Model registrations (staging) Agent configs (staging) Budget allocation (staging) PRODUCTION Model registrations (prod) Agent configs (prod) Budget allocation (prod) promote promote Governance rule: exactly ONE customer-facing control plane may exist here