Freeze the region and year splits and the fire label

Freeze the region and year splits and the fire label

Define the regions, the training years, the held-out region and years, the grid cell size, and what counts as a fire occurrence in a cell-day. Record every data source with its version and license. Deliverable: A split manifest with cell and year counts, a label definition with a worked example, and a statement that the split alone produces no risk estimate.