Run each workflow stage as its own task, with fan-out and fan-in

internal/agents/fork.go

@@ -44,12 +44,14 @@ func (m *Manager) Fork(ctx context.Context, src api.Task, project api.Project, n
 	}
 
 	t, err := m.createTask(ctx, project, api.Task{
-		Title:      fmt.Sprintf("%s (fork of #%d)", src.Title, n),
-		MergeTitle: src.MergeTitle,
-		CreatedBy:  creator.Login,
-		TodoItem:   src.TodoItem,
-		ForkedFrom: &src.Id,
-		ForkedAt:   &n,
+		Title:         fmt.Sprintf("%s (fork of #%d)", src.Title, n),
+		MergeTitle:    src.MergeTitle,
+		CreatedBy:     creator.Login,
+		TodoItem:      src.TodoItem,
+		ForkedFrom:    &src.Id,
+		ForkedAt:      &n,
+		WorkflowRun:   src.WorkflowRun,
+		WorkflowStage: src.WorkflowStage,
 	}, frozen, snap.CommitSha, creator.Login)
 	if err != nil {
 		return api.Task{}, err
@@ -68,7 +70,6 @@ func (m *Manager) Fork(ctx context.Context, src api.Task, project api.Project, n
 		CreatedAt:       time.Now().UTC(),
 		ForkedFrom:      &srcSess.VendorSessionId,
 		ForkedAt:        &at,
-		WorkflowStage:   srcSess.WorkflowStage,
 	}, t.ProjectId)
 	if err != nil {
 		return api.Task{}, fmt.Errorf("task %s created, but its agent session was not: %w", t.Id, err)