refactor: stabilize runtime and unify config

pkg/tools/camera_test.go

@@ -0,0 +1,22 @@
+package tools
+
+import (
+	"context"
+	"strings"
+	"testing"
+)
+
+func TestCameraToolParsesFilenameArg(t *testing.T) {
+	t.Parallel()
+
+	tool := NewCameraTool(t.TempDir())
+	_, err := tool.Execute(context.Background(), map[string]interface{}{
+		"filename": "custom.jpg",
+	})
+	if err == nil {
+		t.Fatal("expected camera access to fail in test environment")
+	}
+	if !strings.Contains(err.Error(), "/dev/video0") && !strings.Contains(err.Error(), "camera device") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}