Add managed macOS Core Audio voice path

PROGRESS.md

@@ -10,18 +10,21 @@ up instantly. Newest status at the top.
 
 ## ▶ Where we left off / next action
 
-- **In progress (2026-09-16): managed macOS client started.** Added a separate .NET 10
-  AppKit solution with native application/menu lifecycle, guest connection, explicit TOFU
-  approval, channel selection, roster, channel chat, voice subscription, disconnect state,
-  accessibility labels, sandbox entitlements and deterministic client disposal. The shared
-  protocol, crypto, audio and client-core projects are referenced directly; the Swift app
-  remains the release client while parity work continues. Added a macOS CI gate that builds
-  the native Opus/RNNoise shim and the AppKit solution. Local Windows compilation of AppKit
-  remains unavailable: installing the macOS workload rolled back after the machine's
-  Visual Studio workload manager failed while repairing an unrelated iOS/Android MSI.
-  **Next:** use the macOS CI compiler to correct any binding issues, then add Core Audio
-  playback/microphone capture and start/stop the managed microphone stream. Follow with
-  saved accounts/servers, private messages, moderation/settings, ScreenCaptureKit sharing,
+- **In progress (2026-09-16): managed macOS client and default audio path.** Added a
+  separate .NET 10 AppKit solution with application/menu lifecycle, guest connection,
+  explicit TOFU approval, channel selection, roster/chat, disconnect state, accessibility
+  labels, sandbox entitlements and deterministic disposal. Voice join now opens bounded
+  stereo playback, subscribes, announces a managed microphone stream, converts the default
+  Core Audio input to interleaved 48 kHz int16 and feeds `VoiceCat.Audio`; leave/disconnect
+  tears the path down. Channel changes suspend and resume voice so streams renegotiate.
+  Playback uses `AVAudioSourceNode` plus the shared tested `PcmRing`; the render callback
+  allocates no managed memory and never locks or blocks. Current AppKit/AVFoundation calls
+  compile warning-free against Microsoft's 26.4.10259 macOS reference assembly. Added a
+  macOS CI gate for the real workload, native Opus/RNNoise shim and Apple solution. Local
+  workload installation remains blocked by this Windows machine's unrelated Visual Studio
+  iOS/Android MSI repair failure, so device execution is not claimed. **Next:** run the
+  macOS CI/device capture-playback test and ten-minute listen gate, then add saved accounts/
+  servers, non-default devices, private messages, moderation/settings, ScreenCaptureKit,
   VoiceOver verification, signing and notarization.
 
 - **Done (2026-09-16): Linux production packaging checkpoint.** Added a real TLS 1.3