Implement native Windows KSwitcher with configurable hotkeys and clipboard history

setup-toolchain.ps1

@@ -0,0 +1,11 @@
+$ErrorActionPreference = 'Stop'
+$tools = Join-Path $PSScriptRoot '.tools'
+New-Item -ItemType Directory -Force $tools | Out-Null
+$archive = Join-Path $tools 'w64devkit.exe'
+$uri = 'https://github.com/skeeto/w64devkit/releases/download/v2.10.1/w64devkit-x64-2.10.1.7z.exe'
+$expected = 'ADD1EDF984CE4D473CFEB7C52E0AB38DB73A855BBA6C7F564D5E16648EB2896A'
+if (!(Test-Path $archive)) { Invoke-WebRequest $uri -OutFile $archive }
+if ((Get-FileHash $archive -Algorithm SHA256).Hash -ne $expected) { throw 'Toolchain checksum mismatch' }
+& $archive -y "-o$tools"
+if ($LASTEXITCODE) { throw 'Toolchain extraction failed' }
+Write-Host 'Compiler ready. Run .\build.ps1 -Test'