dsh-embedded-codex: Using the Official Codex App Server in DeepSeek Harness

`dsh-embedded-codex` is a DeepSeek Harness (DSH) plugin designed to integrate the official Codex App Server. By reusing the local ChatGPT Codex login state through “Codex mode,” it separates responsibilities: Codex handles the model loop, tool calls, and sandbox, while DSH manages sessions and presentation. Installation requires a Node.js and Git environment and supports three permission modes. Implemented through configuration overrides and compatibility support, the plugin enables direct use of Codex’s Agent Runtime for development and testing on the web without modifying DSH’s core code.