Add expert_1 (code) partition of max512 dataset (2,582,713 rows)

Add expert_0 (math) partition of max512 dataset (909,535 rows)

Add 2-cluster (math/code) partition labels for max512 dataset (45 parquet shards aligned 1-1 with input arrow shards)

Delete 88 stale HF datasets cache files (cache-*.arrow)

Upload tulu3_opc-s12_smoltalk_preprocessed-qwen3 (4.15M rows, full preprocessed; prompt_len column intact)

Upload tulu3_opc-s12_smoltalk_preprocessed-qwen3_max512 (3.49M rows, ≤512 tokens, prompt_len-dropped, len-mismatch fixed)

Delete _perm_test.txt with huggingface_hub

permission test

initial commit