dsh-cet-pass: CET-4/6 Passing Score Determination Plugin

dsh-cet-pass is a plugin in the DeepSeek Harness (DSH) ecosystem, maintained by uckkk. It provides a tool named `cet_pass` that automatically determines CET-4/CET-6 passing status in a session, calculates results precisely based on parameters, and returns detailed outputs. The plugin is implemented in pure Node.js, has no network dependencies, and must be installed via a command. Before use, please review the source code and license to ensure compliance with your environment requirements.