Add shard_00001.manifest.json

manifests/shard_00001.manifest.json

@@ -0,0 +1,15 @@
+{
+  "shard_id": 1,
+  "rows": 144684,
+  "size_mb": 213.19,
+  "compression": "zstd",
+  "source_breakdown": {
+    "cosmopedia_v2": 0.256,
+    "tiny_textbooks": 0.0882,
+    "fineweb_edu": 0.5133,
+    "tiny_strange": 0.0823,
+    "mini_en": 0.0602
+  },
+  "created_at": "2026-06-27T08:46:55.344759Z",
+  "run_name": "bison-data-v2"
+}