Add 4 test gages (02338660, 01403060, 06279500, 07144100) for held-out eval

Sequential long-horizon SFT data (no target_nse, NSE-max objective)

Replace 06279500/07144100 with 11383500/07195430 (smaller basins)

Replace data.tar.gz with 11-gage subset (10 training + 02338660 test), MRMS trimmed to 2-month flood windows, placeholder control template

Upload sft_train.jsonl with huggingface_hub

Upload data.tar.gz

Upload data.tar.gz with huggingface_hub

initial commit