fix(core): skip rewriting CoreCLR netstandard facades

[fightroad]

Summary

• Self-contained .NET publish folders ship a
  etstandard.dll that only type-forwards to System.Runtime / System.Private.CoreLib.
• The existing netstandard rewrite cleared those forwards and hid System.Object, crashing analysis with Could not resolve type: System.Object (netstandard, ...).
• Only rewrite when a referenced assembly actually defines System.Object (classic mscorlib case), preserving .NET Standard library support.

Test plan

• Obfuscate a self-contained .NET 8 win-x64 publish set that previously failed on System.Object
• Confirm obfuscating a netstandard2.0 library still keeps netstandard-only references

Made with Cursor

[mcpolo99]

Reviewed the change and ran the full local CI with it rebased onto current develop (which now includes the #101 merge).

Local CI: all phases passed — lint, build (incl. C++/CLI), 189 tests passed / 0 failed / 1 skipped (the skip is the UI-interactive Confuser.GUI.Test), and packaging.

Regression paths for this change verified green:

• CrossFramework.Library.NetStd20 (netstandard2.0 library) builds + covered — the case the second checklist item was about
• CompressorWithResx.Test (12), VisualBasicRenamingResx.Test (1), 389_MixedCultureCasing.Test (1)

The fix is correct and it also removes a latent NullReferenceException (the old subAss?.Modules foreach would throw when a ref failed to resolve). One nit only: the added comments are heavier than needed — the DefinesSystemObject helper already documents intent. Suggested collapse to a single PR reference below.

[mcpolo99]

Collapse this block to a one-line reference; the code below is self-describing:

Suggested change

	// Classic netstandard facades forward to mscorlib, which actually defines the types.
	// Moving those types in keeps the confused module referencing netstandard only.
	// CoreCLR publish output is different: netstandard.dll only forwards to System.Runtime,
	// and that assembly forwards again to System.Private.CoreLib. Clearing the forwards
	// there hides System.Object and breaks later analysis.
	// https://github.com/mcpolo99/ConfuserExx/pull/102

[mcpolo99]

DefinesSystemObject + the early return already say this; drop the comment:

Suggested change

	// Only rewrite when a referenced assembly actually defines System.Object
	// (the mscorlib case). CoreCLR facades only forward it onward.

[mcpolo99]

Drop; Remove(...) is clear enough:

Suggested change

// Their types now live on netstandard, so they must not stay cached.