dsh-repo-map: DSH Repository Structure and Symbol Mapping Plugin

`dsh-repo-map` is a lightweight plugin designed specifically for the DeepSeek Harness (DSH) to reduce high token consumption and interference from irrelevant code when models process repositories. Using read-only mode, it generates repository structures and key symbol mappings to help models quickly locate relevant code without loading entire source files. It intelligently filters generated directories and third-party dependencies, focusing on the structure of core business code. Users should install Node.js 20+ and include the module to improve agent efficiency in understanding large codebases.