refactor(M03): extract WMO placement resolver

src/render/wmo/wmo_placement_resolver.gd

@@ -0,0 +1,32 @@
+class_name WmoPlacementResolver
+extends RefCounted
+
+## Stateless WMO cache-key, placement-identity and world-transform rules.
+
+
+## Returns the historical lowercase slash-normalized relative WMO cache key.
+func normalize_relative_path(relative_wmo_path: String) -> String:
+	return relative_wmo_path.replace("\\", "/").to_lower()
+
+
+## Returns the positive MODF unique-ID key or the historical tile/index fallback.
+func resolve_unique_key(
+		placement: Dictionary,
+		tile_key: String,
+		placement_index: int
+) -> String:
+	var unique_id := int(placement.get("unique_id", -1))
+	if unique_id > 0:
+		return "uid:%d" % unique_id
+	return "tile:%s:%d" % [tile_key, placement_index]
+
+
+## Returns the world-space Godot transform used by every WMO instance path.
+func resolve_world_transform(placement: Dictionary) -> Transform3D:
+	var world_position: Vector3 = placement.get("pos", Vector3.ZERO)
+	var rotation_radians: Vector3 = placement.get("rot", Vector3.ZERO)
+	var scale_value := float(placement.get("scale", 1.0))
+	return Transform3D(
+		Basis.from_euler(rotation_radians).scaled(Vector3.ONE * scale_value),
+		world_position
+	)

src/render/wmo/wmo_placement_resolver.gd.uid

@@ -0,0 +1 @@
+uid://02omydj0sxmo