ROOMS, FOUR AT A TIME  ->  src/assets/rooms/<key>.webp + <key>-off.webp (760 x 425)
One sheet keeps four rooms in exactly the same hand. Optional reference images: one render/photo per room, in order.

One sheet of white marker paper holding a 2x2 grid of four separate interior drawings of rooms in the same house.
Each panel is a wide 16:9 landscape drawing; the four panels are equal in size and separated by clean, even white
gutters - nothing crosses the gutters. {If you attach references: "The reference images, in order, show these four
rooms: use them for each room's furniture and layout, widened to a 16:9 view."}
Top-left panel: {room 1 - furniture, materials, the lamps that glow}.
Top-right panel: {room 2 ...}.
Bottom-left panel: {room 3 ...}.
Bottom-right panel: {room 4 ...}.
Style for every panel: {MARKER STYLE - Interior}

Then: python3 tools/pictools.py split sheet.png src/assets/rooms 760 425 kitchen,living,dining,atrium --off
(names = the room keys used in src/components/rooms/RoomCard.tsx / src/config/rooms.ts; --off writes the greyscale
"lights off" versions)
