dsh-codex Plugin: A DeepSeek Harness Extension Providing a Codex-Style Environment for GPT Models

`dsh-codex` is a DeepSeek Harness (DSH) plugin intended to address underperformance of GPT models in the default Standard mode. It creates a familiar programming environment for GPT models by injecting Codex-style tool interfaces, system prompts, an execution environment, and a terminal view, while preserving DSH's native DeepSeek support. Core capabilities include structured patch tools, a unified execution environment, a customized terminal view, collaborative planning tools, and system prompt injection. To install it, add the package to a DSH profile via the command line and restart the process, then select "Codex-style mode" to enable it. Deployment requires attention to version dependencies and model routing requirements (OpenAI-style tool syntax support is required).