Refactor foreach loops to use explicit .Where() filtering in ScriptGenerator

[Copilot]

Code review feedback identified three foreach loops in ScriptGenerator.cs that implicitly filtered their target sequences using nested if statements. This PR refactors them to use explicit .Where() clauses.

Changes

• CollectAssemblyFiles method: Refactored three foreach loops to use LINQ .Where() filtering:
  • RuntimeEnvironment DLL files enumeration
  • Assembly folder DLL files enumeration
  • Reference paths enumeration

Before/After

// Before
foreach (var file in Directory.GetFiles(RuntimeEnvironment.GetRuntimeDirectory(), "*.dll"))
{
    if (seen.Add(Path.GetFileName(file)))
    {
        yield return file;
    }
}

// After
foreach (var file in Directory.GetFiles(RuntimeEnvironment.GetRuntimeDirectory(), "*.dll").Where(f => seen.Add(Path.GetFileName(f))))
{
    yield return file;
}

The refactoring makes filtering intent explicit while preserving identical behavior and lazy evaluation semantics.

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[Copilot]

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[danielmarbach]

Given that we already use Linq in this class I think that is fine