root 55f8e0fe6e Phase 40: Routing Engine + Policy ...

- RoutingEngine with RouteDecision (model_pattern → provider)
- config/routing.toml: rules, fallback chain, cost gating
- Per-provider Usage tracking in /v1/usage response
- 12 gateway tests green

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..

models.json

qwen3.5 executor + continuation primitive + think:false

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routing.toml

Phase 40: Routing Engine + Policy

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