dsh-github-toolkit: GitHub Operations Toolkit

The `dsh-github-toolkit` provided by DeepSeek Harness (DSH) is a GitHub operations plugin designed specifically for Agents. It aims to reduce the maintenance overhead associated with frequent API calls by encapsulating 18 tool functions. The plugin securely stores sensitive credentials in DSH's credential management system and supports configuration through a Web interface, eliminating the need for hardcoding or restarts. It covers scenarios such as authentication, repository management, file reading and writing, Issues, pull requests, and code checks, while providing read/write permission control and detailed error messages. It requires DSH version 0.1.5-rc.1 or later.