C# runtime implementation for Tsonic's explicitly selected JavaScript source
surface. It owns the closed C# implementations of supported JavaScript
globals and built-ins and depends on @tsonic/csharp-runtime.
Canonical product documentation:
The npm package contains C# source and the native project exported as
@tsonic/csharp-js/runtime.csproj. MSBuild compiles it and its core-runtime
dependency for the application's selected framework.
Compiler-intrinsic carriers remain owned by @tsonic/csharp-runtime.