dsh-llm-codex-oauth: Utilizing ChatGPT / Codex Subscriptions in dsh

dsh-llm-codex-oauth is a DeepSeek Harness plugin designed to allow users with ChatGPT/Codex subscriptions to integrate their subscription quotas into dsh. Maintained by Player-MINEPIG and licensed under MIT, this plugin enables headless login via the pi-ai OAuth device code flow by registering the `codex-oauth` model provider, eliminating the need for a local callback server. Core features include: support for integrating models from the gpt-5.3 to 5.6 series; multimodal input support for images such as PNG and JPEG; secure local storage of credentials in permission-restricted files with automatic token renewal that does not enter logs; provision of a settings page for login status management and commands like `/codex-status` for status checks.