Import art/VFX asset packs + game-feel systems; normalize texture extensions to lowercase for LFS

Add BefourStudios SciFi environment packs, Gabriel Aguiar VFX, and the
ShaderCrew Toon Shader embedded packages, plus combat/enemy/wave/death
gameplay systems and supporting vault docs/screenshots.

Rename 11 vendor textures from uppercase .PNG/.HDR to lowercase so the
case-sensitive Git LFS filters (*.png/*.hdr) match on case-sensitive
filesystems (Linux CI, case-sensitive macOS), not just locally where
core.ignorecase=true masks the gap. Each .meta moved with its asset so
GUID references are preserved. All ~1000 binaries tracked via LFS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scenes/SampleScene.unity

@@ -14,17 +14,17 @@ OcclusionCullingSettings:
 RenderSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 10
-  m_Fog: 0
-  m_FogColor: {r: 0.5, g: 0.5, b: 0.5, a: 1}
+  m_Fog: 1
+  m_FogColor: {r: 0.03, g: 0.045, b: 0.07, a: 1}
   m_FogMode: 3
-  m_FogDensity: 0.01
+  m_FogDensity: 0.018
   m_LinearFogStart: 0
   m_LinearFogEnd: 300
-  m_AmbientSkyColor: {r: 0.212, g: 0.227, b: 0.259, a: 1}
+  m_AmbientSkyColor: {r: 0.05, g: 0.06, b: 0.09, a: 1}
   m_AmbientEquatorColor: {r: 0.114, g: 0.125, b: 0.133, a: 1}
   m_AmbientGroundColor: {r: 0.047, g: 0.043, b: 0.035, a: 1}
   m_AmbientIntensity: 1
-  m_AmbientMode: 0
+  m_AmbientMode: 3
   m_SubtractiveShadowColor: {r: 0.42, g: 0.478, b: 0.627, a: 1}
   m_SkyboxMaterial: {fileID: 10304, guid: 0000000000000000f000000000000000, type: 0}
   m_HaloStrength: 0.5
@@ -164,6 +164,55 @@ Transform:
   m_Children: []
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!1 &228729544
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 228729546}
+  - component: {fileID: 228729545}
+  m_Layer: 0
+  m_Name: GlobalPostFX
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &228729545
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 228729544}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 172515602e62fb746b5d573b38a5fe58, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Unity.RenderPipelines.Core.Runtime::UnityEngine.Rendering.Volume
+  m_IsGlobal: 1
+  priority: 1
+  blendDistance: 0
+  weight: 1
+  sharedProfile: {fileID: 11400000, guid: 669d41422347ed94785dd2515084828f, type: 2}
+--- !u!4 &228729546
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 228729544}
+  serializedVersion: 2
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &330585543
 GameObject:
   m_ObjectHideFlags: 0
@@ -351,8 +400,8 @@ Light:
   m_Enabled: 1
   serializedVersion: 13
   m_Type: 1
-  m_Color: {r: 1, g: 1, b: 1, a: 1}
-  m_Intensity: 2
+  m_Color: {r: 0.6, g: 0.72, b: 0.92, a: 1}
+  m_Intensity: 1.15
   m_Range: 10
   m_SpotAngle: 30
   m_InnerSpotAngle: 21.80208
@@ -414,7 +463,7 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 410087039}
   serializedVersion: 2
-  m_LocalRotation: {x: 0.40821788, y: -0.23456968, z: 0.10938163, w: 0.8754261}
+  m_LocalRotation: {x: 0.44037747, y: -0.26672933, z: 0.13885048, w: 0.8459573}
   m_LocalPosition: {x: 0, y: 3, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
@@ -675,3 +724,4 @@ SceneRoots:
   - {fileID: 1314640900}
   - {fileID: 833091047}
   - {fileID: 121227141}
+  - {fileID: 228729546}