Backend: new kanban API with mock data, five-column task aggregation, task detail, drag-to-move
with block reason validation, and server-side anomaly detection (blocked_timeout, unclaimed,
retry_failure).
Frontend: full kanban page with summary bar + filters, five-column board with BLOCKED orange
border, task cards with color-coded left bar and anomaly highlighting, HTML5 native drag-and-drop
(desktop only), block reason modal, done confirmation, 480px detail drawer with meta/description/
dependencies/activity timeline, floating batch operations bar, and optimistic updates with rollback.
Drawer component: title prop changed from string to ReactNode to support rich title content.
Co-Authored-By: Claude <noreply@anthropic.com>
