Fixes Codex/plugin-harness cold starts for exact static-catalog model ids such as openai/gpt-5.3-codex without adding a second resolver retry loop. The embedded runner now performs the normal provider-runtime attempt with agent discovery skipped, then consults the bundled static catalog before falling back to generic configured-provider synthesis when plugin harness owns transport.
The OpenAI static catalog row carries the Codex ChatGPT transport metadata, dynamic provider metadata still wins for runtime-owned models, and focused regression coverage exercises both paths.
Fixes#88510.
Co-authored-by: yetval <yetvald@gmail.com>
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