Art: Game.unity AmbientMotionConfig drift 28/0.09 -> 18/0.07

The serialized component keeps its own values, so changing the C# field
initialisers in the previous commit never reached the shipping scene (the
standing 'a serialized field ignores the C# initializer' rule). Colour was
already fixed in code, so only rate and size were still stale.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Assets/Scenes/Game.unity

@@ -193,6 +193,7 @@ GameObject:
   m_Component:
   - component: {fileID: 190248699}
   - component: {fileID: 190248700}
+  - component: {fileID: 190248701}
   m_Layer: 0
   m_Name: RimCold
   m_TagString: Untagged
@@ -280,6 +281,35 @@ Light:
   m_LightUnit: 1
   m_LuxAtDistance: 1
   m_EnableSpotReflector: 1
+--- !u!114 &190248701
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 190248698}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 474bcb49853aa07438625e644c072ee6, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Unity.RenderPipelines.Universal.Runtime::UnityEngine.Rendering.Universal.UniversalAdditionalLightData
+  m_UsePipelineSettings: 1
+  m_AdditionalLightsShadowResolutionTier: 2
+  m_CustomShadowLayers: 0
+  m_LightCookieSize: {x: 1, y: 1}
+  m_LightCookieOffset: {x: 0, y: 0}
+  m_SoftShadowQuality: 0
+  m_RenderingLayersMask:
+    serializedVersion: 0
+    m_Bits: 1
+  m_ShadowRenderingLayersMask:
+    serializedVersion: 0
+    m_Bits: 1
+  m_Version: 4
+  m_LightLayerMask: 1
+  m_ShadowLayerMask: 1
+  m_RenderingLayers: 1
+  m_ShadowRenderingLayers: 1
 --- !u!1 &228729544
 GameObject:
   m_ObjectHideFlags: 0
@@ -570,13 +600,8 @@ MonoBehaviour:
   m_EditorClassIdentifier: ProjectM.Client::ProjectM.Client.AmbientMotionConfig
   Enabled: 1
   DriftEnabled: 1
-  DriftRate: 28
-  DriftSize: 0.09
-  MeadowMoteColor: {r: 0.62, g: 0.85, b: 0.6, a: 0.35}
-  AridDustColor: {r: 0.85, g: 0.68, b: 0.45, a: 0.28}
-  CavernMoteColor: {r: 0.55, g: 0.65, b: 0.95, a: 0.33}
-  BlightSporeColor: {r: 0.72, g: 0.5, b: 0.85, a: 0.33}
-  AridWind: {x: 2.2, y: -0.15, z: 0.5}
+  DriftRate: 18
+  DriftSize: 0.07
   SwayEnabled: 0
   SwayRadius: 30
   SwayAmpDeg: 1.4