DeepSeek Harness Plugin: dsh-skill-manager

`dsh-skill-manager` is a lightweight security plugin for DeepSeek Harness Web that manages the invocation of local Skills. It provides list retrieval, on-demand loading, and rapid invocation control, while enforcing strict read-only constraints and an atomic replacement security mechanism. The plugin supports searching and directly controlling the Automatic and /name states without modifying the underlying file system, enabling developers to perform fine-grained management of local Skills.