Add shard_00028.manifest.json

manifests/shard_00028.manifest.json

@@ -0,0 +1,14 @@
+{
+  "shard_id": 28,
+  "rows": 128169,
+  "size_mb": 210.92,
+  "compression": "zstd",
+  "source_breakdown": {
+    "cosmopedia_v2": 0.2962,
+    "tiny_strange": 0.0945,
+    "fineweb_edu": 0.5874,
+    "mini_en": 0.0219
+  },
+  "created_at": "2026-06-27T09:40:22.952496Z",
+  "run_name": "bison-data-v2"
+}