- Updated OpenAI completion request construction to include OpenRouter attribution headers and always-on cache directives (1h TTL).
- Updated image-generation requests to replace legacy X-Title with OpenRouter-specific HTTP-Referer, title, and category headers.
- Removed old OpenRouter X-Title defaults from provider options and removed the matching image-gen header assertion test.
- Added `openai` and `openai-codex` as image providers and let `providers.image=auto` prefer GPT images.
- Updated settings, selector, and SDK wiring so OpenAI image providers pass through `setPreferredImageProvider`.
- Replaced Gemini-only image tooling with `image-gen` and added OpenAI/Codex hosted-image execution with SSE parsing.
- Added image-gen and handoff tests, including final-yield no-compaction regression and OpenAI payload/header assertions.
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