https://github.com/apple/swift-evolution/blob/main/proposals/0339-module-aliasing-for-disambiguation.md#detailed-design アーキテクチャ的なところはDetailed Designのところに結構詳しく書いてありますよ

swift-evolution/0339-module-aliasing-for-disambiguation.md at main ...

This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - swift-evolution/0339-module-aliasing-for-disambiguation.md at main · apple/swift-evolution