Stage assets used by src/stage_city.js ("Downtown Night"). All CC0 1.0 (public domain).

Quaternius - Downtown City MegaKit [Standard]  (CC0, owned copy)
  source: /mnt/codex_hdd_16tb/GameLab-full/CORSAIR/Purchase/Quaternius/Downtown City MegaKit[Standard].zip
  used: kit/Building_Large_2, kit/Building_Medium_2_001, kit/Building_Small_1 (+ their textures, 2k PNG -> 1k JPG)
  licence text: kit/LICENSE_Quaternius.txt ; https://quaternius.com
  re-import: python3 -I tools/stage/import_kit.py

Poly Haven (CC0)  https://polyhaven.com  - fetched 2026-10-23 via api.polyhaven.com, md5-verified
  re-fetch: python3 -I tools/stage/fetch_polyhaven.py
  models (glTF, 1k textures):
    barrel_stove, covered_car, metal_trash_can, exterior_aircon_unit, modular_chainlink_fence,
    modular_electricity_poles, modular_fire_escape, rollershutter_door, utility_box_02,
    security_light, trashbag, wooden_crate_01, cardboard_box_01, old_tyre, concrete_road_barrier_02
  textures (2k JPG): asphalt_02 (road), concrete_pavement (sidewalk)
  HDRI: cobblestone_street_night (2k .hdr) - stage image-based light; suggested scene.environment

Procedural (code in src/stage_city.js, no external assets): neon signs, sky + skyline, dumpster,
traffic cones, vending machines, street lamps, flame/steam sprites, road paint + puddle mask.