thorvald-oai 270d93268c
Send model routing hints to the Codex backend ( #37345 ) ...
## What changed
- Add an `x-codex-routing-hint` header containing the request model and, when selected, the service tier.
- Send the hint on Responses HTTP requests, remote compaction requests, and WebSocket handshakes, including prewarm connections.
- Limit the header to Codex-backend authentication with the OpenAI provider, omitting it for API-key and provider-specific credential paths.
## Testing
- Cover routing hints for HTTP, remote compaction, WebSocket streaming, and tiered prewarming, along with the credential paths where the header must be absent.
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thorvald-oai
270d93268c