Add Xbox UWP port

ports/uwp/scripts/package-game.ps1

@@ -0,0 +1,49 @@
+param(
+    [Parameter(Mandatory = $true)][string]$SourceRoot,
+    [Parameter(Mandatory = $true)][string]$Output
+)
+
+$ErrorActionPreference = 'Stop'
+$source = (Resolve-Path -LiteralPath $SourceRoot).Path
+$required = @('main.lua', 'conf.lua', 'tools/rom_manifest.json')
+$allowedRoots = @('assets/', 'data/', 'mods/', 'src/', 'tools/rom_manifest')
+$forbidden = '(?i)(^|/)(assets/generated|data/generated|build|dist|ports|mobile|tests?)(/|$)|\.(gb|gbc|sav|srm)$'
+
+$tracked = & git -C $source ls-files
+if ($LASTEXITCODE -ne 0) { throw 'git ls-files failed' }
+
+$entries = $tracked |
+    ForEach-Object { $_.Replace('\', '/') } |
+    Where-Object {
+        $path = $_
+        (($required -contains $path) -or ($allowedRoots | Where-Object { $path.StartsWith($_) })) -and
+        $path -notmatch $forbidden
+    } |
+    Sort-Object -Unique
+
+foreach ($path in $required) {
+    if ($entries -notcontains $path) { throw "Required game file is missing from archive input: $path" }
+}
+
+$parent = Split-Path -Parent $Output
+New-Item -ItemType Directory -Force -Path $parent | Out-Null
+if (Test-Path -LiteralPath $Output) { Remove-Item -LiteralPath $Output -Force }
+
+Add-Type -AssemblyName System.IO.Compression
+Add-Type -AssemblyName System.IO.Compression.FileSystem
+$archive = [System.IO.Compression.ZipFile]::Open($Output, 'Create')
+try {
+    foreach ($relative in $entries) {
+        $full = Join-Path $source $relative
+        if (-not (Test-Path -LiteralPath $full -PathType Leaf)) { throw "Tracked file is missing: $relative" }
+        $entry = $archive.CreateEntry($relative, [System.IO.Compression.CompressionLevel]::Optimal)
+        $entry.LastWriteTime = [DateTimeOffset]'2000-01-01T00:00:00Z'
+        $input = [System.IO.File]::OpenRead($full)
+        $outputStream = $entry.Open()
+        try { $input.CopyTo($outputStream) } finally { $outputStream.Dispose(); $input.Dispose() }
+    }
+} finally {
+    $archive.Dispose()
+}
+
+Write-Host "Created $Output with $($entries.Count) tracked, ROM-free entries."