Carbon_Fibre: dielectric, metallic 0 (drop unused Metalness map)

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

Asset Sources/blender_assets.cats.txt

@@ -6,5 +6,5 @@
 
 VERSION 1
 
-6a165bb4-35a8-42c5-904e-cea20c966e8e:Aetheria:Aetheria
+2c70f9d2-3a69-4004-8f42-4712b3e6c439:Aetheria:Aetheria
-815f70ff-5f5c-4582-b612-a6ca360fcc59:Aetheria/PBR:Aetheria-PBR
+a71be0dc-105e-4c66-8ff3-acb25522e9cd:Aetheria/PBR:Aetheria-PBR

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Assets/Materials/PBR/SOURCES.md

@@ -15,7 +15,7 @@ All texture sets are from ambientCG (https://ambientcg.com), licensed CC0 1.0 Un
 | Tread_Diamond | DiamondPlate001 | https://ambientcg.com/view?id=DiamondPlate001 | ambientCG Metalness map |
 | Rubber | Rubber001 | https://ambientcg.com/view?id=Rubber001 | none in set: constant 0 |
 | Plastic_Matte | Plastic004 | https://ambientcg.com/view?id=Plastic004 | none in set: constant 0 |
-| Carbon_Fibre | Fabric004 | https://ambientcg.com/view?id=Fabric004 | ambientCG Metalness map |
+| Carbon_Fibre | Fabric004 | https://ambientcg.com/view?id=Fabric004 | set map is all 1.0; dielectric, so constant 0 |
 
 Files per material: `_Color`, `_Roughness`, `_NormalGL`, `_Metalness` and `_AO` (where the set has them), plus `_MetallicSmoothness.png` generated here for Unity (Metallic in R, Smoothness = 1 - Roughness in A). AO exists only for Paint_Worn_Light and Paint_Worn_Dark.