Added the meat production path — CultureVat and SlabCutter buildings that process raw resources into food. Each has its own visual style and production recipe. The building HUD now shows the active recipe with input and output resources.

Fixed the mine resource percentage calculation which was reporting incorrect values, and added boundary rejection so mines can’t be placed where they’d pierce the asteroid edge. Added tests for both mine boundary checks and resource percentage calculations. Fixed regressions in the production and mine HUD displays.