fix(children): exempt improvement children from orphan-dequeue sweep

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -393,6 +393,9 @@ public sealed class TaskRepository
     {
         var orphanIds = await _context.Tasks
             .Where(t => t.ParentTaskId != null && t.Status == TaskStatus.Queued)
+            // Agent-suggested improvement children (CreatedBy == ParentTaskId) legitimately
+            // queue under a non-planning parent — they are not orphaned planning-chain members.
+            .Where(t => t.CreatedBy == null || t.CreatedBy != t.ParentTaskId)
             .Where(t => !_context.Tasks.Any(p =>
                 p.Id == t.ParentTaskId && p.PlanningPhase != PlanningPhase.None))
             .Select(t => t.Id)