Initial upload of unified math dataset with all difficulty levels

Combined math dataset with 174 sub-datasets across 4 difficulty levels: easy (32), medium (64), hard (64), expert (14). Includes algebra, arithmetic, matrix operations, combinatorics, geometry, and logic puzzles.

README.md

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+---
+dataset_info:
+  features:
+  - name: id
+    dtype: string
+  - name: setting_key
+    dtype: string
+  - name: difficulty
+    dtype: string
+  - name: level
+    dtype: int32
+  - name: messages
+    sequence:
+    - name: role
+      dtype: string
+    - name: content
+      dtype: string
+  - name: ground_truth
+    dtype: string
+  - name: dataset
+    dtype: string
+  - name: omega_split
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 211334898
+    num_examples: 425232
+  download_size: 32847589
+  dataset_size: 211334898
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+---

data/train-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:bc40ffd66cafc8a9b68734a99c1939a1989e46e580e4166130d794b245568c98
+size 32847589