[BUG] Bug report: Cannot use some system libraries or nuget packages

Describe the Bug :

I use System.Text.Json and the NuGet package CsvHelper to process some data files for my mods, but the mod launcher cannot build the sml file.

Steps To Reproduce :

• Create a mod project using ModShardLauncher.Template
• Use System.Text.Json or code from NuGet packages
• dotnet build build the project normally
• Use the launcher to build the project to sml fie, it failed with this error:

[22:37:55 ERR] Cannot understand type System.Text.Json of variable System.Text.Json
[22:37:55 ERR] Cannot understand type System.Text.Json of variable Json
[22:37:55 ERR] Cannot understand type CsvHelper of variable CsvHelper
[22:37:55 ERR] Cannot understand type CsvHelper.Configuration of variable CsvHelper.Configuration
[22:37:55 ERR] Cannot understand type CsvHelper of variable CsvHelper
[22:37:55 ERR] Cannot understand type CsvHelper.Configuration of variable Configuration
[22:37:55 ERR] Cannot understand type ? of variable JsonSerializer
[22:37:55 ERR] Cannot understand type CsvReader of variable var
[22:37:55 ERR] Cannot understand type CsvReader of variable csv
[22:37:55 ERR] Cannot understand type ? of variable Context
[22:37:55 ERR] Cannot understand type CsvReader of variable csv
[22:37:55 ERR] Cannot understand type CsvHelper.Configuration of variable CsvHelper.Configuration
[22:37:55 ERR] Cannot understand type CsvHelper of variable CsvHelper
[22:37:55 ERR] Cannot understand type CsvHelper.Configuration of variable Configuration

Expected Behavior :

The launcher can build the project to sml file.

Additional Information :

• MSL Version : 0.13.2.0

Start by reproducing the failure with a project created from ModShardLauncher.Template, first confirming that dotnet build succeeds and the launcher build fails when System.Text.Json or CsvHelper is used. Trace the launcher’s project-to-SML build path and identify where external namespaces and types are rejected; done means the launcher builds the reproduced project successfully.