DeepSeek Harness — OpenAI Codex Plugin

The DeepSeek Harness plugin, DSH, allows users to connect ChatGPT Plus/Pro subscriptions to a local environment and invoke the Codex model. It supports device-code OAuth login, an interactive `/codex` command, automatic token refresh, and usage monitoring. Installation requires running a command in the specified configuration file, with credentials stored locally by default to ensure secure operation of the DSH environment.