Mute HyperX QuadCast S at logon and sync Windows mute to it

Sets the mic's own hardware mute (USB Audio SET_CUR mute on feature
unit 6, via IDeviceTopology/IAudioMute) when it appears, and follows its
05 10 xx HID mute reports to keep the Windows endpoint mute in step.
Includes build/install/uninstall scripts and a read-only HID listener.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

install.ps1

@@ -0,0 +1,26 @@
+# Builds QuadCastMuteSync, copies it to the install folder and runs it at every logon.
+# No admin rights needed: the task runs as the current user.
+# The default folder is outside AppData on purpose: when run from an MSIX-packaged app
+# (such as some terminals), writes to AppData are redirected and Task Scheduler can't see them.
+param([string]$InstallDir = (Join-Path $env:USERPROFILE 'QuadCastMuteSync'))
+$ErrorActionPreference = 'Stop'
+$TaskName = 'QuadCastMuteSync'
+$dest = $InstallDir
+$exe = Join-Path $dest 'QuadCastMuteSync.exe'
+
+& (Join-Path $PSScriptRoot 'build.ps1')
+
+Get-Process QuadCastMuteSync -ErrorAction SilentlyContinue | Stop-Process -Force
+New-Item -ItemType Directory -Force $dest | Out-Null
+Copy-Item (Join-Path $PSScriptRoot 'bin\QuadCastMuteSync.exe') $exe -Force
+
+$action = New-ScheduledTaskAction -Execute $exe -Argument 'run'
+$trigger = New-ScheduledTaskTrigger -AtLogOn -User "$env:USERDOMAIN\$env:USERNAME"
+$settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries `
+    -ExecutionTimeLimit ([TimeSpan]::Zero) -MultipleInstances IgnoreNew `
+    -RestartCount 3 -RestartInterval (New-TimeSpan -Minutes 1)
+Register-ScheduledTask -TaskName $TaskName -Action $action -Trigger $trigger -Settings $settings `
+    -Description 'Mutes the HyperX QuadCast S at logon and keeps Windows mic mute in sync with it.' -Force | Out-Null
+
+Start-ScheduledTask -TaskName $TaskName
+Write-Host "Installed to $dest and registered logon task '$TaskName' (started now)."