fix: outputDir arg value in mcp.ts

Author: fg-nava

mastra-test-app/src/mastra/mcp.ts

@@ -10,7 +10,7 @@ const buildPlaywrightArgs = () => {
     "--user-agent=Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
     "--viewport-size=1920,1080",
     "--no-sandbox",
-    "--output-dir=artifacts/",
+    "--output-dir=artifacts",
     "--save-session",
     "--save-trace"
   ];