Operator asked for placeholder sprites for playtest feel. Actors now
render the hand-authored pixel maps (tools/aseprite/maps -> assets/
sprites_ph, committed) via code-created Sprite2D — no scene texture
UIDs to hand-author. Dynamic feedback preserved: grunt/burster heat
tint + hit flash drive sprite.modulate, heat-aura ring stays a _draw
overlay; salvage fade drives modulate.a. Arena floor/walls, HUD, and
FX stay primitives. CLAUDE.md greybox-art note updated (was 'no
sprites'); real art (watercolor scenery + pixel sprites) still later.
Smoke gate 3/3 green on nh3-dev headless 4.7.1.
