The Swift helper binaries were compiled with -target macos14.0, causing
dyld symbol-not-found crashes on macOS 13. The ScreenCaptureKit audio
APIs require macOS 13.0 minimum, so the deployment target is lowered to
13.0 and an #available guard is added for the macOS 14-only
ignoreShadowsSingleWindow API. README updated accordingly.
Fixes#199, fixes#200
Added `-target` flag to swiftc compilation to explicitly specify arm64-apple-macos14.0 or x86_64-apple-macos14.0 based on process architecture, ensuring proper binary compilation for darwin-arm64 native helpers.