DeepSeek Harness Scheduled Task Plugin

`dsh-tasks` is a plugin for DeepSeek Harness (DSH) designed to enable scheduled automated execution of prompts. It supports configuring tasks via cron expressions and a visual editor, and allows users to bind workspaces to specified models. It features manual immediate execution, automatic session naming, execution history tracking, and IM notification push with do-not-disturb support. With this plugin, users can extend AI workflows from immediate-response to scheduled-response scenarios, making it suitable for use cases such as daily report generation and knowledge consolidation.