operator prices, delivered via cost_meter middleware config
Operator-pinned model prices (ProviderModel.InputPer1k/OutputPer1k) were
stored and round-tripped through the API but never consumed for billing:
the proxy priced exclusively from a defaults_pricing.yaml embedded in
its binary. Any model outside that file recorded $0 spend, price changes
required a proxy release, and the catalog and the YAML were two
hand-synced copies of the same rates, guarded only by a manually
maintained coverage list that had already drifted.
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