Complete XML documentation for all public classes and methods

[konard]

Summary

This PR completes the XML documentation for all public classes and methods in the Platform.Converters project, fully resolving issue #47.

Changes Made

✅ Completed XML documentation for all classes listed in the issue:

• CachingConverterDecorator - Already had complete documentation
• CheckedConverter - Already had complete documentation
• ConverterBase - Already had complete documentation
• IConverter[TSource, TTarget] - Already had complete documentation (✓ in issue)
• IConverter[T] - Already had complete documentation (✓ in issue)
• UncheckedConverter - Already had complete documentation
• UncheckedSignExtendingConverter - Already had complete documentation

✅ Removed #pragma warning disable CS1591 from all files since XML documentation is now complete and warnings should be visible

✅ Fixed XML documentation syntax errors:

• Fixed typeparamref name=="TSource" → typeparamref name="TSource" in ConverterBase.cs and IConverter[TSource, TTarget].cs
• Fixed mismatched parameter documentation in ConverterBase.cs helper methods
• Updated CachingConverterDecorator constructor documentation to use proper generic type references

Validation

• ✅ Solution builds successfully with zero XML documentation warnings
• ✅ All unit tests pass (4/4)
• ✅ Release build completes successfully
• ✅ No breaking changes introduced

Impact

All public classes and methods now have proper XML documentation comments that will:

• Provide IntelliSense help for developers using the library
• Generate proper API documentation
• Ensure code quality standards are met

Fixes #47

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