forked from tas/major_tom
Replace colored-rect placeholder rendering with proper 16x16 spritesheet art. Charger: orange armored rhino with horn, eyes, walk cycle (row 7). Spawner: purple hive pod with glowing core and tendrils (row 8). Laser turret: angular metallic housing with red lens that brightens when firing (row 8). All three retain colored-rect fallback when spritesheet is unavailable.