fix: read terminal release version reliably

scripts/build-terminal-release.ps1

@@ -13,7 +13,11 @@ $outputDirectory = Join-Path $repositoryRoot 'artifacts'
 
 if ([string]::IsNullOrWhiteSpace($Version)) {
     [xml]$project = Get-Content -LiteralPath $projectPath -Raw
-    $Version = [string]$project.Project.PropertyGroup.Version
+    $versionNode = $project.SelectSingleNode('/Project/PropertyGroup/Version')
+    if ($null -eq $versionNode) {
+        throw "The terminal project does not define a Version property."
+    }
+    $Version = $versionNode.InnerText.Trim()
 }
 if ($Version -notmatch '^\d+\.\d+\.\d+$') {
     throw "Version must use MAJOR.MINOR.PATCH format."