param([string]$MasmRoot = 'F:\MASM32\masm32')
$ErrorActionPreference = 'Stop'
$root = (Resolve-Path (Join-Path $PSScriptRoot '..\..')).Path
Push-Location $root
try {
    & 'C:\Python314\python.exe' tools\tests\export_scratch_probe.py
    if ($LASTEXITCODE -ne 0) { throw 'Scratch probe state export failed' }
    & "$MasmRoot\bin\ml.exe" /c /coff /Cp /nologo /I. /Fobuild\scratch\native-probe.obj tools\tests\scratch_native_probe.asm
    if ($LASTEXITCODE -ne 0) { throw 'Scratch probe assembly failed' }
    $sdkRoot = Join-Path ${env:ProgramFiles(x86)} 'Windows Kits\10\Lib'
    $sdk = Get-ChildItem -LiteralPath $sdkRoot -Directory |
        Sort-Object Name -Descending |
        Where-Object { Test-Path -LiteralPath (Join-Path $_.FullName 'um\x86\kernel32.lib') } |
        Select-Object -First 1
    $libraries = @()
    if ($sdk) { $libraries += '/LIBPATH:' + (Join-Path $sdk.FullName 'um\x86') }
    $libraries += "/LIBPATH:$MasmRoot\lib"
    & "$MasmRoot\bin\link.exe" /nologo /SUBSYSTEM:CONSOLE /ENTRY:ScratchProbeStart @libraries /OUT:build\scratch\native-probe.exe build\scratch\native-probe.obj build\scratch\native-probe-base.obj kernel32.lib winmm.lib user32.lib ws2_32.lib gdi32.lib
    if ($LASTEXITCODE -ne 0) { throw 'Scratch probe link failed' }
    & .\build\scratch\native-probe.exe
    if ($LASTEXITCODE -ne 0) { throw "Scratch probe failed: $LASTEXITCODE" }
    Write-Output 'PASS: 36 edge-coin frames + 78 portrait scratching frames; coating survives view switches; grounded solid counter and hall entry/exit without console or extra charge'
} finally { Pop-Location }