fix: validate workflows and preserve execution outcomes

internal/handler/finalization_helpers.go

@@ -149,6 +149,9 @@ func finalizationCheckMessage(d agentfinalizer.Decision) string {
 }
 
 func finalizationBlockedMessage(d agentfinalizer.Decision) string {
+	if d.CompletionReason == "workflow_rejected" && strings.TrimSpace(d.FinalText) != "" {
+		return d.FinalText
+	}
 	parts := []string{"任务尚未达到最终回复条件，暂不生成成功结论。"}
 	if d.CompletionReason != "" {
 		parts = append(parts, "原因: "+d.CompletionReason)