Add shard_00004.manifest.json

manifests/shard_00004.manifest.json

@@ -0,0 +1,15 @@
+{
+  "shard_id": 4,
+  "rows": 140132,
+  "size_mb": 212.99,
+  "compression": "zstd",
+  "source_breakdown": {
+    "cosmopedia_v2": 0.2651,
+    "fineweb_edu": 0.529,
+    "tiny_strange": 0.0866,
+    "tiny_textbooks": 0.0693,
+    "mini_en": 0.05
+  },
+  "created_at": "2026-06-27T08:52:37.912476Z",
+  "run_name": "bison-data-v2"
+}