- Change provider ID from 'openai-codex' to 'openai-codex-import' to avoid
conflict with core's built-in openai-codex provider
- Update model prefix from 'openai/' to 'openai-codex/' to match core's
namespace convention and avoid collision with standard OpenAI API provider
- Use correct Codex models (gpt-5.3-codex, gpt-5.2-codex) instead of generic
OpenAI models (gpt-4.1, o1, o3)
- Respect CODEX_HOME env var when resolving auth file path, matching core
behavior in src/agents/cli-credentials.ts
- Validate refresh token presence and throw clear error instead of using
empty string which causes silent failures
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