9f610aa8f3
The /kanban CLI + slash command are enough to run the board headlessly, but triage and cross-profile supervision want a visual board. Document the design as a dashboard plugin that: - reads live state from kanban.db over a WebSocket on task_events (no polling) - writes through run_slash() so CLI/gateway/GUI cannot drift - mounts under /api/plugins/kanban/ following the existing 'Extending the Dashboard' plugin shape The plugin is strictly a thin layer over kanban_db — no new business logic, nothing to merge into the kernel.