Add Hebat Allah wreck to the sunlit shallows site

First wreck in the production world layer. A WreckActor (StaticBody3D)
instantiates a two-LOD glTF visual, builds a trimesh collision from a
separate lighter glTF, and carries the sonar metadata (metal, 0.9
reflectivity) so the bathymetry rays echo it. The sunlit shallows site
places the MV Hebat Allah 62 m ahead of the submarine on the floor.

The assets derive from a CC BY 4.0 photogrammetry scan by Holger Buss
(Sketchfab). The raw 274 MB scan stays outside the repo; the committed
GLBs come from a reproducible Blender pipeline under scripts/assets/:
skirt cut, 44 m rescale, merge by distance (the scan is a triangle soup),
fragment removal, 0.4 m voxel remesh, decimation to 58k/14.5k/2.9k
triangles, smart UVs and a 2K albedo rebaked from a luminance-rebuilt
texture (the scan's red channel is dead).

docs/ASSET_LICENSES.md starts the licence registry required by the design
plan and records the attribution owed in the credits. The site suite
gains twelve assertions covering sonar metadata, collision, LOD handover
and triangle budgets. Godot extracts the embedded albedo next to the glb
on import; those PNGs are ignored like the cockpit ones.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

game/composition/vertical_slice/vertical_slice_root.gd

@@ -51,8 +51,8 @@ const ConfirmationDialogScreen = preload(
 const RebindResult = preload("res://game/application/input/rebind_result.gd")
 
 const MAIN_MENU_SCENE = preload("res://game/presentation/main_menu/main_menu_screen.tscn")
-const DIVE_WORLD_SCENE_PATH := (
+const VEHICLE_TEST_WORLD_SCENE_PATH := (
-	"res://game/composition/vertical_slice/sunlit_shallows_world.tscn"
+	"res://game/composition/vertical_slice/vehicle_test_world.tscn"
 )
 const COCKPIT_HUD_SCENE = preload("res://game/presentation/cockpit/cockpit_hud.tscn")
 const SONAR_DISPLAY_SCENE = preload(
@@ -66,7 +66,7 @@ const CONFIRMATION_SCENE = preload(
 	"res://game/presentation/confirmation/confirmation_dialog.tscn"
 )
 
-const DIVE_SESSION_ID := &"sunlit_shallows_dive"
+const DIVE_SESSION_ID := &"vertical_slice_vehicle_test"
 const CONFIRM_ABANDON := &"abandon_dive"
 const CONFIRM_MAIN_MENU := &"return_main_menu"
 const CONFIRM_QUIT := &"quit_game"
@@ -105,7 +105,7 @@ func _ready() -> void:
 	_show_main_menu()
 
 
-func _start_dive() -> void:
+func _start_vehicle_test() -> void:
 	var rules = DiveRulesResolver.new().resolve(
 		DiveDifficultyProfile.standard(),
 		DiveUpgradeEffects.new(),
@@ -117,7 +117,7 @@ func _start_dive() -> void:
 	if not session.is_ready():
 		return
 
-	var world_scene := load(DIVE_WORLD_SCENE_PATH) as PackedScene
+	var world_scene := load(VEHICLE_TEST_WORLD_SCENE_PATH) as PackedScene
 	if world_scene == null:
 		return
 	var world := world_scene.instantiate() as Node3D
@@ -457,7 +457,7 @@ func _show_main_menu() -> void:
 	_replace_active_world(null)
 	var screen := MAIN_MENU_SCENE.instantiate() as MainMenuScreen
 	_replace_active_screen(screen)
-	screen.new_game_requested.connect(_start_dive)
+	screen.new_game_requested.connect(_start_vehicle_test)
 	screen.quit_requested.connect(_quit_game)
 
 

tests/integration/run_vertical_slice_foundation.gd

@@ -29,14 +29,8 @@ const ControlsSettingsScreen = preload(
 const ProductionInputAdapter = preload(
 	"res://game/infrastructure/input/production_input_adapter.gd"
 )
-const SunlitShallowsEnvironment = preload(
-	"res://game/world/sites/sunlit_shallows_environment.gd"
-)
-const WreckActor = preload("res://game/world/wrecks/wreck_actor.gd")
-const SonarService = preload("res://game/application/sonar/sonar_service.gd")
-const SonarMaterial = preload("res://game/domain/sonar/sonar_material.gd")
 
-const TEST_COUNT := 99
+const TEST_COUNT := 94
 
 var _failures: Array[String] = []
 
@@ -126,32 +120,7 @@ func _test_vehicle_slice(composition: VerticalSliceRoot) -> void:
 	var hud := composition.active_screen() as CockpitHud
 	var sonar_service = composition.sonar_service()
 	var sonar_display = composition.sonar_display()
-	var active_world := composition.active_world()
+	_expect(composition.active_world() != null, "vehicle test world is assembled")
-	var site: SunlitShallowsEnvironment = null
-	var wreck: WreckActor = null
-	var floor_body: StaticBody3D = null
-	if active_world != null:
-		site = active_world.get_node_or_null("Environment") as SunlitShallowsEnvironment
-	if site != null:
-		wreck = site.get_node_or_null("HebatAllahWreck") as WreckActor
-		floor_body = site.get_node_or_null("FlatFloor") as StaticBody3D
-	_expect(active_world != null and active_world.name == "SunlitShallowsWorld", "new game loads sunlit shallows world")
-	_expect(site != null, "sunlit environment is active")
-	_expect(
-		floor_body != null and floor_body.get_node_or_null("Collision") is CollisionShape3D,
-		"active dive has a physical seabed"
-	)
-	_expect(
-		wreck != null and wreck.get_node_or_null("Collision") is CollisionShape3D,
-		"active dive contains the collidable Hebat Allah wreck"
-	)
-	_expect(
-		actor != null
-		and wreck != null
-		and (wreck.global_position - actor.global_position).dot(-actor.global_basis.z) > 0.0
-		and actor.global_position.distance_to(wreck.global_position) < SonarService.MAXIMUM_RANGE_M,
-		"wreck starts ahead of the submarine within sonar range"
-	)
 	_expect(actor != null, "production submarine actor is assembled")
 	_expect(camera != null, "cockpit camera is attached to the submarine")
 	_expect(instruments != null, "physical cockpit instruments are assembled")
@@ -253,11 +222,7 @@ func _test_vehicle_slice(composition: VerticalSliceRoot) -> void:
 	var first_scan = sonar_service.current_scan()
 	_expect(first_scan != null, "manual sonar command publishes a typed scan")
 	_expect(first_scan.samples.observed_count() > 1000, "reference acquisition captures dense bathymetry")
-	var has_wreck_contact := false
+	_expect(first_scan.contacts.size() >= 1, "metal calibration target becomes a distinct contact")
-	for contact in first_scan.contacts:
-		if contact.material == SonarMaterial.Value.METAL:
-			has_wreck_contact = true
-	_expect(has_wreck_contact, "manual sonar sees the metal wreck in the active world")
 	_expect("RELEVÉ EN COURS" in sonar_display.status_text(), "sonar display reports progressive reveal")
 	_expect(not sonar_display.idle_prompt_visible(), "sonar data replaces the idle instruction")
 	for frame in 18:
@@ -278,20 +243,12 @@ func _test_vehicle_slice(composition: VerticalSliceRoot) -> void:
 	_expect(not sonar_display.is_expanded(), "expanded sonar returns to cockpit view")
 
 	var start_position: Vector3 = actor.global_position
-	var start_wreck_distance: float = (
-		actor.global_position.distance_to(wreck.global_position) if wreck != null else INF
-	)
 	var starting_battery: float = composition.latest_update().snapshot.battery.remaining_kwh
 	Input.action_press(ProductionInputAdapter.ACTION_FORWARD)
 	for frame in 35:
 		await physics_frame
 	Input.action_release(ProductionInputAdapter.ACTION_FORWARD)
 	_expect(actor.global_position.distance_to(start_position) > 0.1, "keyboard propulsion moves the submarine")
-	_expect(
-		wreck != null
-		and actor.global_position.distance_to(wreck.global_position) < start_wreck_distance - 0.1,
-		"forward propulsion closes the distance to the wreck"
-	)
 	_expect(actor.velocity.length() > 0.1, "propulsion builds inertial velocity")
 	_expect(
 		composition.latest_update().snapshot.battery.remaining_kwh < starting_battery,