Add shard_00042.manifest.json

manifests/shard_00042.manifest.json

@@ -0,0 +1,19 @@
+{
+  "shard_id": 42,
+  "rows": 163789,
+  "size_mb": 198.93,
+  "compression": "zstd",
+  "source_breakdown": {
+    "finewiki": 0.3432,
+    "arithmetic": 0.1204,
+    "tiny_math": 0.1207,
+    "fineweb_edu": 0.1696,
+    "cosmopedia_v2": 0.0853,
+    "python_edu": 0.1048,
+    "tiny_textbooks": 0.0135,
+    "tiny_strange": 0.0279,
+    "mini_en": 0.0146
+  },
+  "created_at": "2026-07-13T19:02:05.485586Z",
+  "run_name": "bison-data-v2"
+}