Link dataset to paper and Github repository (#2)

README: document pretraining/ + benchmark/ split with per-part download

Reorganize into pretraining/ and benchmark/ subfolders (server-side move, same URL)

README: embed benchmark task overview figure

Add benchmark task overview figure

Add aligned 128ppd GeoTIFFs

Add pre-normalized mmap pretraining arrays

Upload lunar_patches_v4.h5 with huggingface_hub

Upload channel_stats.json with huggingface_hub

Upload README.md with huggingface_hub

initial commit