dsh-tool-codegraph: DeepSeek Harness Code Navigation Plugin

dsh-tool-codegraph is a plugin for DeepSeek Harness that wraps open-source CLI tools to provide code navigation capabilities for agents. It requires a Node.js environment and offers 10 tools after installation, including code indexing, symbol search, call graph analysis, and impact assessment. Users must manually initialize the index, and grep-based search is recommended as a fallback in dynamic distribution scenarios.