dsh-plugin-compare: A Controlled A/B Comparison Tool for DeepSeek Harness Plugins and Presets

`dsh-plugin-compare` is the comparison plugin for DeepSeek Harness (DSH), used to validate plugin changes and preset differences. It supports evidence-based side-by-side timelines, A/B comparisons, and reports in multiple formats (HTML, JSON, etc.). Installation requires Node.js 22.19+, and it becomes available in the interface after starting via Web Host. A test environment must be prepared before use. Note that exported content may contain sensitive information and requires manual masking; statistical intervals do not automatically identify a winner; the system automatically copies the workspace and captures Git evidence, but ignores specific directories and symbolic links.