nx_graphics_demo_test.nx

nx_graphics_demo_test.nx -- end-to-end G1 pipeline KAT. Proves the full bits-up graphics path from raster to viewable image: alloc fb -> clear black -> rasterize triangle (Pineda edge fn) -> present via swapchain (PPM_BUFFER destination) -> verify PPM bytes Composes: nx_framebuffer.nx (i64 cell buffer + clear + set + pack_rgba) nx_raster_sw.nx (Pineda triangle rasterizer) nx_swapchain.nx (destination abstraction) nx_ppm_writer.nx (PPM P6 serializer, via swapchain) This is the substrate-honest "see it work end-to-end" gate for NISHI_GRAPHICS_ROADMAP G1. Same primitives, ONE call.