MOTIR-211Done
Epic 4: Agile planning
Sprint-based delivery on top of the issue tracker: the backlog, sprints (create / start / complete), story-point estimation, the Scrum board (the Epic-3 Kanban surface scoped to a board's active sprint, under a sprint header — Story 4.5, moved here from Epic 3 per mistake #32 so it ships alongside the sprints it depends on), and the velocity + burndown charts that make iteration measurable. Turns Motir from an issue tracker into a full agile-planning tool — the Scrum half of the Jira feature set, with the Scrum view sitting on the same board substrate Epic 3 already shipped.