Add shard_00042.manifest.json

manifests/shard_00042.manifest.json

@@ -0,0 +1,14 @@
+{
+  "shard_id": 42,
+  "rows": 118143,
+  "size_mb": 205.87,
+  "compression": "zstd",
+  "source_breakdown": {
+    "fineweb_edu": 0.5972,
+    "cosmopedia_v2": 0.2999,
+    "tiny_strange": 0.0978,
+    "mini_en": 0.0051
+  },
+  "created_at": "2026-06-27T10:11:55.286570Z",
+  "run_name": "bison-data-v2"
+}