nx_game_engine_compose_test.nx

nx_game_engine_compose_test.nx -- the full game-loop scaffold. All 4 new primitives composed with the prior Minecraft-MCU substrate. Realistic game-loop shape: 1. world_seed generates 16x16x8 terrain from seed=42 2. font + 1bpp framebuffer prepared 3. raycast + dither pattern renders the world to fb 4. text_render overlays "Z42" coordinate 5. input drives camera movement 6. q14_math normalizes camera direction This proves the substrate-side game engine works end-to-end on a hardware-floor that maps cleanly to ESP32-class silicon.