Make python available to Windows MSBuild custom steps

ddiff --git a/tools/build-sdk-windows.ps1 b/tools/build-sdk-windows.ps1
iindex ad91425..9b15f72 100644
---- a/tools/build-sdk-windows.ps1
++++ b/tools/build-sdk-windows.ps1
@@@ -42,6 +42,72 @@ function Ensure-PythonOnPath {
  }
  
  
++
++# OPENVIBE_PYTHON_SHIM_FOR_MSBUILD
++function Ensure-PythonCommandForMSBuild {
++  $shimDir = Join-Path $Root "artifacts/python-shim"
++  New-Item -ItemType Directory -Force -Path $shimDir | Out-Null
++  $log = Join-Path $LogDir "python-version.txt"
++  "=== Ensure-PythonCommandForMSBuild ===" | Out-File $log
++  "initial PATH=$env:PATH" | Out-File $log -Append
++  "pythonLocation=$env:pythonLocation" | Out-File $log -Append
++  "Python_ROOT_DIR=$env:Python_ROOT_DIR" | Out-File $log -Append
++
++  $candidates = New-Object System.Collections.Generic.List[string]
++  foreach ($base in @($env:pythonLocation, $env:Python_ROOT_DIR, $env:Python3_ROOT_DIR)) {
++    if ($base) {
++      [void]$candidates.Add((Join-Path $base "python.exe"))
++      [void]$candidates.Add((Join-Path $base "python3.exe"))
++    }
++  }
++
++  foreach ($name in @("python.exe", "python3.exe", "py.exe")) {
++    $cmd = Get-Command $name -ErrorAction SilentlyContinue
++    if ($cmd -and $cmd.Source) { [void]$candidates.Add($cmd.Source) }
++  }
++
++  foreach ($rootCandidate in @("C:\hostedtoolcache\windows\Python", "C:\hostedtoolcache\windows\PyPy")) {
++    if (Test-Path $rootCandidate) {
++      Get-ChildItem -Path $rootCandidate -Recurse -File -Filter "python.exe" -ErrorAction SilentlyContinue |
++        Sort-Object LastWriteTime -Descending |
++        ForEach-Object { [void]$candidates.Add($_.FullName) }
++    }
++  }
++
++  $py = $null
++  foreach ($cand in ($candidates | Select-Object -Unique)) {
++    if ($cand -and (Test-Path $cand)) {
++      $py = (Resolve-Path $cand).Path
++      break
++    }
++  }
++
++  if (-not $py) {
++    "candidate list:" | Out-File $log -Append
++    $candidates | Out-File $log -Append
++    throw "Python executable not found after setup-python/vcvars. Check python-version.txt in the debug artifact."
++  }
++
++  $pyDir = Split-Path -Parent $py
++  $bat = Join-Path $shimDir "python.bat"
++  $cmdFile = Join-Path $shimDir "python.cmd"
++  $batContent = @"
++@echo off
++"$py" %*
++exit /b %ERRORLEVEL%
++"@
++  Set-Content -Encoding ascii -Path $bat -Value $batContent
++  Set-Content -Encoding ascii -Path $cmdFile -Value $batContent
++
++  # Put the shim first so custom build steps that literally run `python` find it.
++  $env:PATH = "$shimDir;$pyDir;$env:PATH"
++  "selected python=$py" | Out-File $log -Append
++  "shimDir=$shimDir" | Out-File $log -Append
++  "updated PATH=$env:PATH" | Out-File $log -Append
++  & $py --version 2>&1 | Tee-Object -FilePath $log -Append
++  & cmd.exe /d /s /c "where python" 2>&1 | Tee-Object -FilePath $log -Append
++}
++
  function Find-VcVars64 {
    $candidates = @(
      "${env:ProgramFiles}\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat",