DeepSeek Harness Periodic Habit Scheduler Plugin: dsh-wash-calendar

`dsh-wash-calendar` is a tool in the DeepSeek Harness plugin ecosystem that fills the gap in the "Health/Habits" category, specifically addressing recurring task scheduling. It translates "last time + interval" date calculations into four tool functions: computing the next date, enumerating schedules within a range, validating the status of a given day, and providing suggestions in Chinese. The plugin can be installed from npm or GitHub, depends on a specific date format and interval range, and is suitable for scenarios such as laundry/care routines and workouts, enabling an agent to manage recurring tasks without writing date helper functions.