Add shard_00031.manifest.json

manifests/shard_00031.manifest.json

@@ -0,0 +1,14 @@
+{
+  "shard_id": 31,
+  "rows": 128299,
+  "size_mb": 210.83,
+  "compression": "zstd",
+  "source_breakdown": {
+    "fineweb_edu": 0.5992,
+    "cosmopedia_v2": 0.3012,
+    "tiny_strange": 0.0971,
+    "mini_en": 0.0025
+  },
+  "created_at": "2026-06-27T09:46:44.223658Z",
+  "run_name": "bison-data-v2"
+}