dsh-chess-open: Chess Opening Plugin

The DeepSeek Harness plugin dsh-chess-open is designed for board game applications and is implemented in pure Node.js. It provides chess opening options and parameterized learning paths through local logic, without making network requests. Developers can install it using the specified commands and invoke its tools within the DSH environment. When using the plugin, attention should be paid to dependency versions and permissions. It is suitable for scenarios requiring locally hosted chess knowledge.