dsh-graduate-exam: Postgraduate Entrance Exam Cutoff Check

The DSH (DeepSeek Harness) plugin `dsh-graduate-exam` is specifically designed for graduate entrance exam cutoff assessment, centered on the core philosophy that "everything is a plugin." It provides a local computation solution, requires no internet connection, and supports precise calculation via parameters to return results. The plugin is implemented entirely in Node.js, has no network dependencies at runtime, and its source code is hosted on GitHub. Users can install it with a terminal command and directly invoke the registered tool in a DSH session. Since it runs with the permissions of the current process, it is recommended to inspect the source code before installation.