Direct OpenAI image calls can inherit downstream User-Agent values from the Gin request context, which may trigger upstream Cloudflare 1010 blocks.
Clone inbound Codex headers for direct image requests and remove only User-Agent before applying defaults. This keeps Version, X-Codex-Turn-Metadata, X-Client-Request-Id, and Originator forwarding intact.
Expand direct image regression coverage for downstream identity headers and align edit endpoint expectations with /images/edits.
- Introduced the `gpt-image-2` model in Codex built-ins and updated visibility logic in the registry.
- Added direct proxy support for OpenAI image generation and editing endpoints.
- Implemented new execution paths for `/images/generations` and `/images/edit`, ensuring seamless handling for both JSON and multipart payloads.
- Expanded test coverage to validate the new model and direct proxy features, including streaming scenarios and error handling.
