dsh-disk-guard: DeepSeek Harness Disk Guard Plugin

DSH-disk-guard is a plugin for DeepSeek Harness (DSH) designed to address the C-drive space usage caused by caches and files generated by large model runs. It supports redirecting download artifacts, caches, and environment variables to a user-specified directory, and automatically injects a path-discipline prompt to prevent C-drive exhaustion. It provides a zero-dependency command-line tool for checking status, clearing caches, and modifying paths. After installation, DSH must be restarted for the plugin to take effect.