DarkUnbug 1.0.5-beta.1 client startup compatibility test.
Preserves original 1.0.4-beta.1 code. Does NOT use the broken 1.0.3 preLaunch hook.
The new Mixin config plugin is selected before Mixin prepare and removes only Cosmetica's conflicting Fabric redirect if and only if the exact affected version pair is installed.
Cosmetica's common mixins, Spell Engine's redirect and original DarkUnbug functionality remain untouched.
Requires actual Fabric Minecraft runtime tests before public release.
