Upload data/corpus_train.bin with huggingface_hub

Upload data/corpus_val.bin with huggingface_hub

cleanup: remove old shards, corpus.bin, stale train/val

v0.0.1: corpus_train.bin (shuffled, pre-split)

v0.0.1: corpus_val.bin (shuffled, pre-split)

v0.0.1: corpus.bin (single flat file, uint16, shape [N, 6144])

v0.0.1: shard_0018.bin

v0.0.1: shard_0017.bin

v0.0.1: shard_0014.bin

v0.0.1: shard_0013.bin

v0.0.1: shard_0019.bin

v0.0.1: shard_0016.bin

v0.0.1: shard_0009.bin

v0.0.1: shard_0007.bin

v0.0.1: shard_0006.bin

v0.0.1: shard_0015.bin

v0.0.1: shard_0005.bin

v0.0.1: shard_0010.bin

v0.0.1: shard_0004.bin

v0.0.1: shard_0012.bin

v0.0.1: shard_0011.bin

v0.0.1: shard_0008.bin

v0.0.1: shard_0003.bin

v0.0.1: shard_0002.bin

v0.0.1: shard_0001.bin

v0.0.1: shard_0000.bin