nx_vnsprite.nx

nx_vnsprite.nx -- certified composable part: the VN SPRITE COMPOSITOR (gamebench bit 13). REFERENCE BAR RESEARCHED 2026-07-29 (never invent a ruler, applied to the build itself): the field standard is Ren'Py's layeredimage -- layers organized into ATTRIBUTE GROUPS (expression / outfit / pose) where selecting one attribute auto-excludes the rest of its group, so a 4-outfit x 6-emotion character is 10 layers, not 24 images -- plus dissolve transitions as the core scene grammar (renpy.org/doc/html/layeredimage.html). This part is those semantics, sovereign and integer: z-ordered clipped alpha blits + GROUP-EXCLUSIVE attribute selection + integer dissolve, with the layer STATE a pure i64 vector so a scene round-trips through nx_gamesave (parts doctrine). HONEST DELTA declared: commercial 2026 SOTA adds Live2D-class mesh-deformed "living" sprites -- that is the animation-skeletal / soft-tissue axis (separate bits), not flat compositing. LIB, no main. KEY color, alpha, groups are PARAMETERS (rule 11); art quality is the critic's axis, composition correctness is THIS axis. license_tier: ORIGINAL expect_exit: 0