dsh-plan-checkup: DeepSeek Harness Plan Review Plugin

`dsh-plan-checkup` is a workflow plugin maintained by Bear0117, designed to help developers validate agent plans in DeepSeek Harness (`/plan`) mode. It provides rule-based suggestions through review cards and supports real-time progress checks, color-coded flags, and detailed data analysis. Users can vote and use the "Put in Message Box" feature to initiate requested changes. The plugin supports local checks or a cloud judgment engine, ensures data security, and does not perform automatic approval operations.