`VoiceCat.Mac` is the native AppKit C# port. It targets `net10.0-macos` and references the same `VoiceCat.Core` and `VoiceCat.Audio` assemblies used by the Windows client and managed CLI.
The current checkpoint is a functional client: AppKit launch/menu lifecycle, saved server profiles, guest and account authentication, explicit TOFU approval (including changed-key warning), protected-channel password prompts, channel selection, user roster, channel text, voice subscription, managed microphone-stream lifecycle, default-device Core Audio capture/playback, disconnect reporting, native accessibility labels, sandbox/network/audio entitlements, and deterministic disposal. Profiles save the host, port, authentication mode, username or guest nickname. An account password can be remembered as a macOS Keychain generic-password item only after successful authentication; it is never written to profile JSON and is removed when remembering is disabled or the profile is deleted. Capture is converted to interleaved 48 kHz int16 PCM through `AVAudioConverter`; playback uses an `AVAudioSourceNode` and the shared bounded `PcmRing`, so its render callback does not allocate, lock, or block. It does not yet replace the Swift release. Non-default device selection, moderation sheets, private messages, settings, ScreenCaptureKit sharing, VoiceOver verification, signing and notarization remain.
The native build stages an `osx-arm64``libvoicecat_media.dylib`; that shim contains only Opus/RNNoise. The AppKit and AVFoundation calls are also compiled against Microsoft's current macOS reference assembly during development, but only a macOS host can link, launch, grant microphone access and verify live devices. The macOS CI build and manual listen test are required release gates.
