Regenerate add_sub_6digit with borrow enrichment

add_sub_6digit/config.json

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+{
+  "n_digits": 6,
+  "ops": "add_sub",
+  "train_size": 500000,
+  "val_size": 10000,
+  "enrichment": "sum-to-9 (addition) + equal-digit borrow (subtraction) + 1% equal operands",
+  "columns": [
+    "tokens",
+    "labels",
+    "op",
+    "complexity",
+    "cascade_depth",
+    "x_digits",
+    "y_digits",
+    "z_digits",
+    "sa",
+    "st",
+    "sv"
+  ]
+}

add_sub_6digit/eval_stratified.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:310453a805069ad6b3c7df9805fdfdcdab4f1c4f218c55ae41c29612dd0aebad
+size 36665

add_sub_6digit/train.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:0fbfcda092d553137a3220735d5c8810c4103ae810822c197919c13048fa5296
+size 15086159

add_sub_6digit/val.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:957583add2ef74f092c7c2545cc370497a1667e45c82108140acddd1df3deea5
+size 312454