feat(M03): add environment snapshot facade

src/render/environment/world_environment_snapshot.gd

@@ -0,0 +1,40 @@
+class_name WorldEnvironmentSnapshot
+extends RefCounted
+
+## Immutable renderer input describing the authoritative time within one world day.
+## DBC light, area, fog and skybox selection remain owned by the sky controller.
+
+const HOURS_PER_DAY := 24.0
+const SCRIPT_PATH := "res://src/render/environment/world_environment_snapshot.gd"
+
+var is_valid: bool:
+	get:
+		return _is_valid
+
+var time_of_day_hours: float:
+	get:
+		return _time_of_day_hours
+
+var failure_code: StringName:
+	get:
+		return _failure_code
+
+var _is_valid: bool
+var _time_of_day_hours: float
+var _failure_code: StringName
+
+
+## Creates a snapshot and normalizes finite input into the half-open [0, 24) day.
+## Non-finite input produces an explicit invalid value instead of renderer state.
+static func at_time_of_day(time_of_day_hours_value: float) -> RefCounted:
+	return load(SCRIPT_PATH).new(time_of_day_hours_value)
+
+
+func _init(time_of_day_hours_value: float) -> void:
+	_is_valid = is_finite(time_of_day_hours_value)
+	_time_of_day_hours = (
+		fposmod(time_of_day_hours_value, HOURS_PER_DAY)
+		if _is_valid
+		else 0.0
+	)
+	_failure_code = &"" if _is_valid else &"environment_time_not_finite"

src/render/environment/world_environment_snapshot.gd.uid

@@ -0,0 +1 @@
+uid://dass4mi3ex2fu

src/render/world_render_facade.gd

@@ -8,17 +8,24 @@ extends Node
 const GODOT_WORLD_POSITION_SCRIPT := preload("res://src/domain/coordinates/godot_world_position.gd")
 const STREAMING_FOCUS_SCRIPT := preload("res://src/domain/streaming/streaming_focus.gd")
 const RENDERED_GROUND_SAMPLE_SCRIPT := preload("res://src/render/terrain/rendered_ground_sample.gd")
+const WORLD_ENVIRONMENT_SNAPSHOT_SCRIPT := preload("res://src/render/environment/world_environment_snapshot.gd")
 
 ## Internal renderer implementation resolved relative to this node.
 ## The referenced node remains owned by its scene parent.
 @export var streaming_world_loader_path: NodePath = NodePath("..")
 
+## Scene-owned outdoor environment implementation resolved relative to this node.
+## The facade delegates snapshots but owns neither the controller nor Environment.
+@export var world_environment_controller_path: NodePath = NodePath("../WowSkyController")
+
 ## Optional explicit Node3D source sampled in Godot world coordinates.
 ## Runtime scenes use the player; capture and probe tools replace it with their camera.
 @export var streaming_focus_source_path: NodePath
 
 var _streaming_world_loader: Node
+var _world_environment_controller: Node
 var _missing_loader_reported := false
+var _missing_environment_controller_reported := false
 var _missing_focus_source_reported := false
 
 
@@ -94,6 +101,21 @@ func renderer_ground_query_snapshot(godot_world_position: GodotWorldPosition) ->
 	return (snapshot_variant as Dictionary).duplicate(true)
 
 
+## Applies an immutable environment snapshot through the renderer-owned sky path.
+## Returns false for an invalid value or unavailable/incompatible controller.
+func apply_environment_snapshot(world_environment_snapshot: RefCounted) -> bool:
+	if (
+		world_environment_snapshot == null
+		or world_environment_snapshot.get_script() != WORLD_ENVIRONMENT_SNAPSHOT_SCRIPT
+		or not bool(world_environment_snapshot.get("is_valid"))
+	):
+		return false
+	var controller := _resolve_world_environment_controller()
+	if controller == null:
+		return false
+	return bool(controller.call("apply_environment_snapshot", world_environment_snapshot))
+
+
 func _capture_streaming_focus_from_source() -> void:
 	if streaming_focus_source_path == NodePath():
 		return
@@ -138,3 +160,20 @@ func _resolve_streaming_world_loader() -> Node:
 	_streaming_world_loader = candidate
 	_missing_loader_reported = false
 	return _streaming_world_loader
+
+
+func _resolve_world_environment_controller() -> Node:
+	if is_instance_valid(_world_environment_controller):
+		return _world_environment_controller
+	var candidate := get_node_or_null(world_environment_controller_path)
+	if candidate == null or not candidate.has_method(&"apply_environment_snapshot"):
+		if not _missing_environment_controller_reported:
+			push_error(
+				"WorldRenderFacade cannot resolve a compatible environment controller at %s"
+				% world_environment_controller_path
+			)
+			_missing_environment_controller_reported = true
+		return null
+	_world_environment_controller = candidate
+	_missing_environment_controller_reported = false
+	return _world_environment_controller