dsh-project-kanban: Project Board Plugin for DeepSeek Harness

dsh-project-kanban is a kanban plugin within DeepSeek Harness (DSH), designed to address the issue of scattered planning, task decomposition, and defect tracking information for intelligent agent developers during conversations. This plugin enables agents to directly create and update planning cards through `kanban_*` tools, with data isolated by workspace (project) and persistently stored in disk JSON files. Core features include: card tags and custom colors, high/medium/low priority marking, column sorting and drag-and-drop insertion, keyword and multi-dimensional filtering search, due date setting and overdue highlighting, recycle bin management, batch operations, statistical data viewing, 50-step undo, cross-project card movement, and source session traceability. Installation requires using the `dsh` CLI, with recommendations to add it from GitHub or npm, and some versions...