- Add OpenAI as new API provider with support for gpt-5.4, gpt-5.3-codex, gpt-5.4-mini models
- Extend model configuration system to include OpenAI provider
- Add isCodexSubscriber function for OpenAI authentication detection
- Update model options and descriptions for Codex models
- Create codex-fetch-adapter for OpenAI API integration
- Add OpenAI OAuth configuration and authentication URLs
- Update default model selection logic for Codex users
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Squash the current repository state back into one baseline commit while
preserving the README reframing and repository contents.
Constraint: User explicitly requested a single squashed commit with subject "asdf"
Confidence: high
Scope-risk: broad
Reversibility: clean
Directive: This commit intentionally rewrites published history; coordinate before future force-pushes
Tested: git status clean; local history rewritten to one commit; force-pushed main to origin and instructkr
Not-tested: Fresh clone verification after push
