docs: condense implementation comments

clients/windows/VoiceCat.App/Audio/ProcessLoopbackCapture.cs

@@ -1,17 +1,8 @@
 using System.Runtime.InteropServices;
 
-// Single-process WASAPI loopback capture via AUDIOCLIENT_ACTIVATION_PARAMS
-// (Windows 10 2004+ / Build 19041+).
-//
-// Threading: ALL WASAPI init runs on the capture thread (MTA). If called from the
-// WinForms UI thread (STA), ActivateAudioInterfaceAsync fires ActivateCompleted on
-// an MTA pool thread; COM marshals that back to the STA pump — but the STA thread is
-// blocked on CompletionEvent.Wait → deadlock. MTA capture thread avoids this.
-//
-// COM QI policy: the COM objects returned by the process-loopback activation path
-// reject QueryInterface for their own IIDs under .NET's RCW mechanism. Every call
-// to IAudioClient and IAudioCaptureClient is therefore dispatched via raw vtable
-// pointer arithmetic, bypassing .NET COM interop entirely.
+// Process loopback requires MTA activation; blocking activation from the WinForms STA
+// deadlocks COM completion. The returned interfaces also reject RCW QueryInterface, so audio
+// calls use explicitly owned raw pointers and vtable dispatch.
 namespace VoiceCat.App.Audio;
 
 public sealed class ProcessLoopbackCapture : IDisposable