feat(roadblock): persist roadblock count on the task

src/ClaudeDo.Worker/Runner/TaskRunner.cs

@@ -335,6 +335,10 @@ public sealed class TaskRunner
         // so the sequential chain (which advances on terminal states) is unaffected.
         // Planning parents (PlanningPhase != None) are containers, not reviewable work.
         var finishedAt = DateTime.UtcNow;
+        using (var ctx = _dbFactory.CreateDbContext())
+        {
+            await new TaskRepository(ctx).SetRoadblockCountAsync(task.Id, result.Blocks.Count, CancellationToken.None);
+        }
         var reviewResult = ComposeReviewResult(result.ResultMarkdown, result.Blocks);
         if (task.ParentTaskId is null && task.PlanningPhase == PlanningPhase.None)
         {