- Removed Sprint view (now just Kanban + Backlog)
- Kanban shows only tasks from current active sprint
- Sprint header shows current sprint info
- 3-column layout: To Do, In Progress, Done
- Done column combines review + done tasks
- Auto-assign new tasks to current sprint
- Tasks without sprints won't show in Kanban (go to Backlog)
- Created data/tasks.json with all 13 tasks
- Added data directory that was missing after server restart
- Tasks now properly persisted to file storage
- All previous work restored (Tasks #1-13)