Add shard_00070.manifest.json

bison-data-v1/shard_00070.manifest.json

@@ -0,0 +1,13 @@
+{
+  "shard_id": 70,
+  "rows": 164564,
+  "size_mb": 77.83,
+  "compression": "zstd",
+  "source_breakdown": {
+    "tiny_math": 0.335,
+    "python_edu": 0.286,
+    "arithmetic": 0.378
+  },
+  "created_at": "2026-06-24T16:21:14.718609Z",
+  "run_name": "bison-data-v1"
+}