DrawAhead.Chunk/ChunkHeight (ruling asteroids-on-floater-layer); ZoneRenderer and the
chunk reticle both read it; ChunkWorldPosition and the renderer's global are gone.
Fixes the reticle sitting off the rock by |field|. Test: AChunkIsDrawnOnTheFloaterLayerOverTheField.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>