papernotes

add PointNet paper note with full Read Paper skill format

add MaX-DeepLab background and pixel feature resolution explanation, restructure with kMaX as evolution from MaX

update kMaX-DeepLab note with full Read Paper skill format, add page references and ablation tables

add kMaX-DeepLab paper note

improve DenseCRF note: clarify MAP goal, explain all symbols, add inference difficulty background