feat(cockpit): replace procedural cockpit with twelve scripted models

Instance twelve Blender-scripted glTF models in the cockpit scene and
rebuild the cabin around them: gauge panel, sonar, switch panel, alert
box, speaker, porthole, hull wall, caged lamps, gas bottle, handrails
and side consoles. Presentation only; no domain, application or world
rule changes beyond enabling glow in the test environment.

- Needles, alert lamps and sonar screen are driven by the existing
  snapshots; the alert box now carries SYS/ATTN/ALRM.
- Depth dial reads percent of certified depth.
- Sonar display restyled as a turquoise holographic relief with a
  shader grid and height scale; SubViewport matches the glass (960x604).
- Cabin lighting retuned: warm pooled lamp light, cool porthole rim,
  lamp shadows, dial backlight.
- Procedural stand-ins removed (bulkhead, tanks, consoles, levers,
  indicator columns, placeholder pipe run, dial face PNGs).
- Tests adapted where nodes disappeared; one assertion removed
  (pipe_segment_count) until the pipe kit is placed.
- Model .glb files are committed without LFS; textures Godot extracts
  next to them at import are ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

game/presentation/cockpit/cockpit_practical_lighting.gd

@@ -9,6 +9,28 @@ const CockpitMeshFactory = preload(
 	"res://game/presentation/cockpit/cockpit_mesh_factory.gd"
 )
 
+const CAGE_LAMP_SCENE = preload("res://game/presentation/cockpit/assets/models/cage_lamp.glb")
+
+## Flange centre of the right-hand lamp, on the flat end cap of the pressure
+## hull beside the porthole (the left lamp mirrors x). The cap is flat there, so
+## the lamp is seated square to it, facing the cabin.
+const LAMP_MOUNT_OFFSET := Vector3(0.636, 1.106, -1.3)
+## Centre of the glass globe in the lamp model: where the light is emitted.
+const LAMP_GLOBE_CENTRE := Vector3(0.0, 0.0, 0.064)
+## Globe emission (1.5 as exported): lower, so the globe does not bloom into a blob.
+const LAMP_GLASS_ENERGY := 1.0
+## Tungsten-like caged lamps: the cabin's main light.
+const WARM_LAMP_COLOR := Color(1.0, 0.66, 0.4)
+const WARM_LAMP_ENERGY := 0.5
+## Same dimming ratio as before when the red emergency light takes over.
+const WARM_LAMP_CRITICAL_ENERGY := 0.23
+## Short range and a steep falloff: each lamp makes a pool on the wall around
+## it and leaves the lower and outer hull dark.
+const WARM_LAMP_RANGE_M := 1.6
+const WARM_LAMP_ATTENUATION := 2.0
+## Cabin parts are centimetre-scale: the default bias detaches their shadows.
+const WARM_LAMP_SHADOW_BIAS := 0.03
+
 var _materials: CockpitMaterialPalette
 var _warm_lights: Array[OmniLight3D] = []
 var _emergency_light: OmniLight3D
@@ -17,8 +39,8 @@ var _emergency_light: OmniLight3D
 func _init(materials: CockpitMaterialPalette) -> void:
 	_materials = materials
 	name = "PracticalLighting"
-	_add_caged_lamp(-0.76, -8.0)
-	_add_caged_lamp(0.76, 8.0)
+	_add_caged_lamp(-1.0)
+	_add_caged_lamp(1.0)
 	_add_fill_light()
 	_add_emergency_light()
 
@@ -26,75 +48,69 @@ func _init(materials: CockpitMaterialPalette) -> void:
 func present(alert_level: DiveAlertLevel.Value) -> void:
 	_emergency_light.visible = alert_level >= DiveAlertLevel.Value.CRITICAL
 	for light: OmniLight3D in _warm_lights:
-		light.light_energy = 0.22 if alert_level >= DiveAlertLevel.Value.CRITICAL else 0.48
+		light.light_energy = (
+			WARM_LAMP_CRITICAL_ENERGY
+			if alert_level >= DiveAlertLevel.Value.CRITICAL
+			else WARM_LAMP_ENERGY
+		)
 
 
 func practical_light_count() -> int:
 	return _warm_lights.size()
 
 
-func _add_caged_lamp(x: float, roll_degrees: float) -> void:
+func _add_caged_lamp(side: float) -> void:
 	var root := Node3D.new()
 	root.name = "CagedLamp"
-	root.position = Vector3(x, 0.88, -1.16)
-	root.rotation_degrees.z = roll_degrees
+	root.position = Vector3(
+		side * LAMP_MOUNT_OFFSET.x,
+		LAMP_MOUNT_OFFSET.y,
+		LAMP_MOUNT_OFFSET.z
+	)
 	add_child(root)
-	CockpitMeshFactory.add_box(
-		"LampHousing",
-		root,
-		Vector3(0.0, 0.0, -0.025),
-		Vector3(0.14, 0.11, 0.055),
-		_materials.dark_steel
+	var model := CAGE_LAMP_SCENE.instantiate() as Node3D
+	model.name = "CageLampModel"
+	root.add_child(model)
+	# The light sits inside the cage, 3 cm from its bars: casting, the lamp's
+	# own body would swallow it.
+	CockpitMeshFactory.disable_shadow_casting(model)
+	var glass := CockpitMeshFactory.own_surface_material(
+		model.find_child("CageLamp_Glass", true, false) as MeshInstance3D
 	)
-	CockpitMeshFactory.add_sphere(
-		"WarmBulb",
-		root,
-		Vector3(0.0, 0.0, 0.04),
-		0.038,
-		_materials.warm_glass
-	)
-	for x_offset: float in [-0.048, -0.024, 0.0, 0.024, 0.048]:
-		CockpitMeshFactory.add_box(
-			"LampGuard",
-			root,
-			Vector3(x_offset, 0.0, 0.095),
-			Vector3(0.007, 0.10, 0.007),
-			_materials.brushed_steel
-		)
-	for y_offset: float in [-0.04, 0.04]:
-		CockpitMeshFactory.add_box(
-			"LampGuardRail",
-			root,
-			Vector3(0.0, y_offset, 0.095),
-			Vector3(0.115, 0.007, 0.007),
-			_materials.brushed_steel
-		)
+	if glass != null:
+		glass.emission_energy_multiplier = LAMP_GLASS_ENERGY
 	var light := OmniLight3D.new()
 	light.name = "WarmPracticalLight"
-	light.position = Vector3(0.0, -0.03, 0.16)
-	light.light_color = Color(1.0, 0.55, 0.26)
-	light.light_energy = 0.48
-	light.omni_range = 1.75
-	light.shadow_enabled = false
+	light.position = LAMP_GLOBE_CENTRE
+	light.light_color = WARM_LAMP_COLOR
+	light.light_energy = WARM_LAMP_ENERGY
+	light.omni_range = WARM_LAMP_RANGE_M
+	light.omni_attenuation = WARM_LAMP_ATTENUATION
+	light.shadow_enabled = true
+	light.shadow_bias = WARM_LAMP_SHADOW_BIAS
 	root.add_child(light)
 	_warm_lights.append(light)
 
 
 func _add_fill_light() -> void:
-	var cool_fill := OmniLight3D.new()
-	cool_fill.name = "CoolRearFill"
-	cool_fill.position = Vector3(0.0, 0.42, 0.35)
-	cool_fill.light_color = Color(0.24, 0.46, 0.47)
-	cool_fill.light_energy = 0.36
-	cool_fill.omni_range = 3.0
-	cool_fill.shadow_enabled = false
-	add_child(cool_fill)
+	# The only cool light in the cabin: sea light entering through the porthole,
+	# placed just inside the glass so it rims the ring, its bolts and the first
+	# band of wall, and reaches the dashboard only from behind.
+	var porthole_fill := OmniLight3D.new()
+	porthole_fill.name = "PortholeFill"
+	porthole_fill.position = Vector3(0.0, 0.47, -1.2)
+	porthole_fill.light_color = Color(0.30, 0.56, 0.78)
+	porthole_fill.light_energy = 1.0
+	porthole_fill.omni_range = 1.1
+	porthole_fill.shadow_enabled = false
+	add_child(porthole_fill)
 
 
 func _add_emergency_light() -> void:
 	_emergency_light = OmniLight3D.new()
 	_emergency_light.name = "EmergencyLight"
-	_emergency_light.position = Vector3(-0.58, 0.44, -0.83)
+	# High and central, so no single dial sits right under it and washes out.
+	_emergency_light.position = Vector3(0.0, 1.1, -0.95)
 	_emergency_light.light_color = Color(1.0, 0.04, 0.015)
 	_emergency_light.light_energy = 1.4
 	_emergency_light.omni_range = 2.4