Address review: distinguish unknown pricing from an intentional free price. A
turn's all-zero cost is treated as unknown (counted toward missingCostEntries)
only when the operator did NOT explicitly configure the model's price under
models.providers -- i.e. the zero is a generated-catalog default (codex/gpt-5.x),
not a deliberate $0. Operator-configured zero-cost models keep reporting a
complete $0.
Adds resolveConfiguredModelCost() to read config-only pricing, and regression
tests for both paths (unconfigured unknown -> missing; configured free -> $0).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
16702496c6