dsh-codex-tools: Adding Codex Search, Image Generation, and Image Recognition Tools to DeepSeek Harness

`dsh-codex-tools` is a plugin for DeepSeek Harness (DSH), maintained by SPYQWER1, providing three tools: `codex_web_search`, `image_gen`, and `image_vision`, which respectively enable public web search summarization, bitmap generation, and local image understanding. This plugin reuses existing ChatGPT/Codex login sessions and does not offer standalone login or LLM services. Search supports customizing the number of sources and freshness; image generation supports multiple sizes and formats, with output paths restricted to the DSH session workspace, prohibiting absolute paths, parent directories, and symbolic links, and not overwriting existing files; image vision recognition only accepts local files within the workspace that meet specific format and size constraints. Installation requires Node>=22 environment, supports adding via Git or npm, and after installation