dsh-stock-level: Reorder Point Calculation Tool

This article introduces the `dsh-stock-level` plugin for the DeepSeek Harness (DSH) workflow, which is used to accurately calculate reorder points. The plugin is implemented in pure Node.js, requires no network dependencies, and depends on core environments such as `@deepseek-ai/cordis`. Developers can install it using the specified command and invoke its registered `stock_level` tool within the workflow to handle inventory business logic efficiently.