Add shard_00003.manifest.json

manifests/shard_00003.manifest.json

@@ -0,0 +1,15 @@
+{
+  "shard_id": 3,
+  "rows": 142564,
+  "size_mb": 213.0,
+  "compression": "zstd",
+  "source_breakdown": {
+    "fineweb_edu": 0.5267,
+    "tiny_textbooks": 0.0745,
+    "tiny_strange": 0.0837,
+    "cosmopedia_v2": 0.2632,
+    "mini_en": 0.0519
+  },
+  "created_at": "2026-06-27T08:50:42.360733Z",
+  "run_name": "bison-data-v2"
+}