xby-chess: A DeepSeek Harness Plugin for Chess FEN Validation and Visualization

xby-chess is a plugin for DeepSeek Harness (DSH), maintained by xby-skill. It provides chess FEN validation and ASCII board visualization, designed to address the cumbersome debugging of chess positions in text-based environments. Core features include configuring a persistent API key (obtained from the official Xiaobenyang website) and converting FEN strings into ASCII board views. The plugin is installed via command and is suitable for DSH agent developers working with chess logic.