refactor: enhance event consumption logic and add graph tool completion test

internal/ai/runtime/executor/event_consumer.go

@@ -74,6 +74,8 @@ func consumeAgentEvents(events *adk.AsyncIterator[*adk.AgentEvent], summary *Run
 			summary.Status = "interrupted"
 		case strings.TrimSpace(summary.ReplyText) != "":
 			summary.Status = "completed"
+		case hasInvokedGraphTool(summary.InvokedToolCodes):
+			summary.Status = "completed"
 		default:
 			summary.Status = "fallback"
 		}
@@ -81,6 +83,15 @@ func consumeAgentEvents(events *adk.AsyncIterator[*adk.AgentEvent], summary *Run
 	summary.ToolCallCount = len(summary.InvokedToolCodes)
 }
 
+func hasInvokedGraphTool(toolCodes []string) bool {
+	for _, toolCode := range toolCodes {
+		if toolx.ResolveToolSourceType(toolCode) == enums.ToolSourceTypeGraph {
+			return true
+		}
+	}
+	return false
+}
+
 func buildInterruptSummaries(event *adk.AgentEvent) []InterruptContextSummary {
 	if event == nil || event.Action == nil || event.Action.Interrupted == nil {
 		return nil