fix: update LLMRouter callers after API refactor to use NewLLMRouterDefault

action/router.go

@@ -20,7 +20,7 @@ func LLMRouterActivity(ctx context.Context, input routing.LLMRouterInput) (*rout
 	}
 
 	// Create router
-	router, err := routing.NewLLMRouter(kb)
+	router, err := routing.NewLLMRouterDefault(kb)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create router: %w", err)
 	}