Rename 2025_Q2/18_220819.json to 2025_Q2/20250418_220819.json

2025_Q2/{18_220819.json → 20250418_220819.json}

@@ -1,6 +1,5 @@
 {
     "left": "deepseek-r1",
     "right": "mistral-large-latest",
-    "winner": "right",
-    "timestamp": "20250418_220819"
+    "winner": "right"
 }