feat(sandbox): openai model provider authenticates via ChatGPT OAuth (requires_openai_auth)#112
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--model-provider openai now emits requires_openai_auth = true (and no env_key) so codex authenticates that provider with the injected ChatGPT oauth token instead of an api key. --model-name and --model-base-url pass through; the model and base_url default to codex's ChatGPT endpoint. Ark providers (model_square / coding_plan / agent_plan) are unchanged.
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Reuses the existing --model-provider / --model-name / --model-base-url path.
When --model-provider is openai, build_codex_config_toml emits requires_openai_auth = true and no env_key, so codex authenticates that provider with the chatgpt oauth token from
agentkit sandbox codex-login. --model-name and --model-base-url pass through (base-url can point at a proxy); they default to codex's ChatGPT endpoint and gpt-5-codex. Ark providers (model_square / coding_plan / agent_plan) keep env_key = CODEX_API_KEY.requires_openai_auth is a ModelProviderInfo field in codex 0.135.
Tests cover the openai case and that Ark providers are unchanged. ruff/mypy pass.
Note: takes effect when the tool is created with --model-provider openai. Serving a turn from a China-region sandbox additionally needs egress to OpenAI via a supported region (codex has CODEX_REFRESH_TOKEN_URL_OVERRIDE for the token refresh).