feat: add stylized villager presentation

tests/jajce_world_scaffold_test.gd

@@ -78,6 +78,10 @@ func _run() -> void:
 		waterfall_mist.draw_pass_1 != null,
 		"Waterfall mist particles should have visible billboard geometry"
 	)
+	_check(
+		waterfall_mist.position.distance_to(Vector3(25.0, 0.8, -24.0)) < 0.01,
+		"Waterfall mist should stay at the waterfall base instead of obscuring the village"
+	)
 	_check(world.has_node("WaterRoot/RiverSurface"), "WaterRoot should include a river surface")
 	var environment: Environment = (
 		(world.get_node("WorldEnvironment") as WorldEnvironment).environment
@@ -97,16 +101,25 @@ func _run() -> void:
 		"VillageRoot should include the mill and bridge blockouts"
 	)
 	var smoke_count := 0
+	var smoke_is_translucent := true
 	for suffix in ["House_01", "House_02", "House_03"]:
 		if world.has_node("VillageRoot/%s/Smoke" % suffix):
 			var smoke: GPUParticles3D = world.get_node("VillageRoot/%s/Smoke" % suffix)
 			if smoke.draw_pass_1 == null:
 				continue
+			var smoke_material := (smoke.draw_pass_1 as QuadMesh).material as StandardMaterial3D
+			smoke_is_translucent = (
+				smoke_is_translucent
+				and smoke_material != null
+				and smoke_material.transparency != BaseMaterial3D.TRANSPARENCY_DISABLED
+				and smoke_material.albedo_color.a < 0.5
+			)
 			smoke_count += 1
 	_check(
 		smoke_count >= 2,
 		"At least two houses should have chimney smoke particles (found %s)" % smoke_count
 	)
+	_check(smoke_is_translucent, "Chimney smoke should not render as opaque white quads")
 	var lookdev: Node3D = load("res://world/jajce/JajceLookdev.tscn").instantiate()
 	_check(lookdev.has_node("JajceWorld"), "Lookdev should instance JajceWorld")
 	_check(lookdev.has_node("BeautyCamera"), "Lookdev should provide a beauty camera")