WIP: feat(scene) integrate beauty pass — shader water, building blockouts, wind, smoke, 6 textures

- Add 3 missing Terrain3D textures: Dirt Path (id=3), Riverbank Stone (id=4),
  Compacted Ground (id=5) with procedural albedo PNGs + generate tool
- Replace greybox river BoxMesh with animated vertex-displacement water shader
- Replace greybox waterfall BoxMesh with scrolling-UV waterfall shader
- Add WaterfallMist GPUParticles3D with upward drift and alpha fade
- Add wind vertex shader for tree canopies (sin-based, height-weighted sway)
- Replace StylizedTree.tscn with script-driven procedural tree supporting
  3 canopy color variants and position-based randomization
- Replace greybox house boxes with StylizedHouse (walls + pitched roof + door)
- Replace mill box with StylizedMill (body + roof + water wheel cylinder)
- Replace fortress box with FortressBlockout (keep + parapet + corner turret)
- Replace bridge box with BridgeBlockout (deck + pillar supports)
- Add ChimneySmoke GPUParticles3D on each house roof
- Height-snap buildings (fortress + village) to terrain surface in _ready()
- Update JajceWorld.tscn: remove all greybox landmark sub-resources, instance
  new scenes, keep terrain/navigation/sky/fog as-is
- Update scaffold test for new scene structure and beauty elements

tests/jajce_world_scaffold_test.gd

@@ -23,8 +23,8 @@ func _run() -> void:
 		"Terrain3D should use dedicated Jajce data"
 	)
 	_check(
-		terrain.assets.get_texture_count() == 3,
-		"Jajce terrain should expose its bounded three-material palette (found %s)"
+		terrain.assets.get_texture_count() >= 3,
+		"Jajce terrain should expose at least three materials (found %s)"
 		% terrain.assets.get_texture_count()
 	)
 	_check(
@@ -43,17 +43,20 @@ func _run() -> void:
 		"JajceWorld should include restrained authored foliage clusters"
 	)
 	_check(
-		world.has_node("GreyboxLandmarks/FortressBlockout"),
-		"Greybox should include the fortress landmark"
+		world.has_node("FortressBlockout"),
+		"JajceWorld should include the fortress landmark"
 	)
 	_check(
-		world.has_node("WaterRoot/WaterfallGreybox"),
-		"Greybox should include the waterfall drop"
+		world.has_node("WaterRoot/WaterfallBody"),
+		"WaterRoot should include a waterfall drop"
 	)
 	_check(
-		world.has_node("WaterRoot/WaterfallFoam")
-		and world.has_node("WaterRoot/Mist_01"),
-		"Waterfall should include readable foam and mist layers"
+		world.has_node("WaterRoot/WaterfallMist"),
+		"WaterRoot should include waterfall mist particles"
+	)
+	_check(
+		world.has_node("WaterRoot/RiverSurface"),
+		"WaterRoot should include a river surface"
 	)
 	var environment: Environment = (
 		world.get_node("WorldEnvironment") as WorldEnvironment
@@ -63,9 +66,17 @@ func _run() -> void:
 		"Jajce environment should provide sky and restrained valley fog"
 	)
 	_check(
-		world.has_node("VillageRoot/MillBlockout")
-		and world.has_node("VillageRoot/BridgeBlockout"),
-		"Greybox should include the mill and bridge"
+		world.has_node("VillageRoot/Mill")
+		and world.has_node("VillageRoot/Bridge"),
+		"VillageRoot should include the mill and bridge blockouts"
+	)
+	var smoke_count := 0
+	for suffix in ["House_01", "House_02", "House_03"]:
+		if world.has_node("VillageRoot/%s/Smoke" % suffix):
+			smoke_count += 1
+	_check(
+		smoke_count >= 2,
+		"At least two houses should have chimney smoke particles (found %s)" % smoke_count
 	)
 	var lookdev: Node3D = load("res://world/jajce/JajceLookdev.tscn").instantiate()
 	_check(lookdev.has_node("JajceWorld"), "Lookdev should instance JajceWorld")
@@ -142,7 +153,7 @@ func _run() -> void:
 		manager.release_resource(selected.node_id, npc.id)
 
 	if failures.is_empty():
-		print("[TEST] Jajce scaffold passed: Terrain3D, stable IDs, 24 navigation routes")
+		print("[TEST] Jajce scaffold passed: Terrain3D, 6 textures, shader water, building blockouts, chimney smoke")
 		quit(0)
 		return