CellRange
StructSource: Projection.h
Description
Half-open cell-space window [startCol, endCol) x [startRow, endRow) covering a screen rectangle, under a given ProjectionSpec.
Field names are deliberately identical to TilemapDirtyTrackingHelper's (include/graphics/Renderer.h), so the eventual renderer wiring is a rename-free assignment rather than a mapping. A default-constructed CellRange is empty (start == end == 0 on both axes), matching "nothing to draw".
