Add shard_00071.manifest.json

bison-data-v1/shard_00071.manifest.json

@@ -0,0 +1,13 @@
+{
+  "shard_id": 71,
+  "rows": 160639,
+  "size_mb": 77.81,
+  "compression": "zstd",
+  "source_breakdown": {
+    "arithmetic": 0.382,
+    "tiny_math": 0.334,
+    "python_edu": 0.284
+  },
+  "created_at": "2026-06-24T16:24:08.505567Z",
+  "run_name": "bison-data-v1"
+}