feat(roadblock): persist roadblock count on the task

src/ClaudeDo.Data/Models/TaskEntity.cs

@@ -30,6 +30,7 @@ public sealed class TaskEntity
     public DateTime? ScheduledFor { get; set; }
     public string? Result { get; set; }
     public string? ReviewFeedback { get; set; }
+    public int RoadblockCount { get; set; }
     public string? LogPath { get; set; }
     public required DateTime CreatedAt { get; init; }
     public DateTime? StartedAt { get; set; }