cmp-skill-index: DSH plugin that provides DSH with a 70-entry skill index for codex-mobile-pro

The DeepSeek Harness (DSH) plugin cmp-skill-index indexes the 70 skills in codex-mobile-pro, enabling agents to retrieve and reuse them on demand at runtime. Developed in pure JavaScript, it requires no compilation and provides two core tools: list_skills and search_skills. Installation is simple, supporting direct installation from GitHub or local package installation. It aims to help DSH agents reduce hardcoded dependencies and improve development efficiency.