dsh-cylinder: A Pure Node.js Cylinder Calculation Plugin

DeepSeek Harness (DSH) adopts an “everything is a plugin” architecture. To address geometric computation needs, the dsh-cylinder plugin provides a pure Node.js local computation solution that obtains cylinder-related metrics without network requests. Integrated into DSH by registering as a tool, it aims to reduce latency and complexity, making it suitable for scenarios requiring fast cylinder geometry calculations. Once installed, it can be invoked directly within a session, and its execution permissions should be assessed carefully.