- Extend BulkTaskBody with reclaim_first: bool = False
- In bulk_update, use kanban_db.reassign_task(..., reclaim_first=True)
when payload.reclaim_first is set and assignee is present
- Falls back to existing assign_task behavior when reclaim_first is false
This enables the dashboard to bulk-reassign running tasks by
reclaiming their claims first, matching the single-task
/tasks/{id}/reassign endpoint behavior.
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