C++ enum values missing qualifier

[adamski]

The enum values in the switch statement (Success, ErrorInvalidInput, etc.) are being used without the SyncResult:: prefix or proper scoping. While this might work due to C++'s enum scoping rules, it's inconsistent with C++ best practices. Consider either using the enum class syntax or explicitly qualifying the enum values as SyncResult::Success, SyncResult::ErrorInvalidInput, etc.

Originally posted by @Copilot in #19 (comment)