GARDEN SITE PLAN, NIGHT  ->  src/assets/render/garden-night.webp (same size, same framing as the day plan)
Use the DAY plan as the input picture (image edit / img2img, strength 0.35-0.5) so every line stays registered.

The same garden site plan at night. Keep every line, object, plant and position exactly as it is - same layout, same
framing, same top-down view. Lay deep indigo-blue and dark blue-grey alcohol-marker washes over the whole drawing:
roofs and paving in dark slate blue, lawn, trees and plants in deep blue-green, gravel in dusky grey-blue, timber in
dark umber. Water glows softly aqua from within. Every garden lamp is switched OFF and dark (the app draws the lamp
glows itself, from the light states). Same alcohol-marker and black fineliner style on paper. No text, no labels.

No generator at hand: python3 tools/pictools.py night garden-day.webp src/assets/render/garden-night.webp
