docs: package and document experimental OpenXR support

Launcher/Build-Installer.ps1

@@ -98,7 +98,7 @@ Assert-Directory $dependencySources 'Pinned offline dependency sources'
 # to compile (launcher/Prepare-NativePrebuilt.ps1).
 # Kept in step with InstalledLayout.DependencyNames by Test-PinnedFacts.ps1: the installed host
 # refuses to call a toolkit complete unless every one of these directories is present.
-$requiredDependencies = @('abseil-cpp','cppwinrt','dawn_prebuilt','fmt','freetype','imgui','libusb','native_prebuilt','png','SDL','sqlite3','tracy','xxhash','zlib','zstd')
+$requiredDependencies = @('abseil-cpp','cppwinrt','dawn_prebuilt','fmt','freetype','imgui','libusb','native_prebuilt','openxr','png','SDL','sqlite3','tracy','xxhash','zlib','zstd')
 
 # The precompiled archives are only interchangeable with what the user's machine
 # compiles if both came from this toolchain and this flag set, so a stale package
@@ -225,6 +225,7 @@ Write-Host '[3/6] Writing manifests and third-party license inventory...'
 Copy-Item (Join-Path $portableTools 'README-LICENSES.txt') (Join-Path $payloadRoot 'licenses\Portable-build-tools.txt')
 Copy-Item (Join-Path $repoRoot 'aurora-main\LICENSE') (Join-Path $payloadRoot 'licenses\Aurora-LICENSE.txt')
 Copy-Item (Join-Path $dependencySources 'cppwinrt\LICENSE.txt') (Join-Path $payloadRoot 'licenses\CppWinRT-LICENSE.txt')
+Copy-Item (Join-Path $dependencySources 'openxr\LICENSE') (Join-Path $payloadRoot 'licenses\OpenXR-SDK-LICENSE.txt')
 # The precompiled aurora/third-party archives are built from the very sources
 # already shipped under build-workspace\Dependencies and aurora-main, so they add
 # no third-party component and therefore no new license obligation.

Launcher/LocalBuild.ps1

@@ -189,12 +189,13 @@ $pins = Get-MkwProjectPins $project
 # (the real RAM guard, capping concurrent clang compiles of memory-hungry translated TUs via the Ninja
 # MKW_TRANSLATED_COMPILE_JOBS pool), and $globalJobs (Ninja's overall parallelism for everything else).
 # An explicit -Parallel pins all three.
-$memoryGiB = [math]::Max(1, [math]::Floor((Get-CimInstance Win32_ComputerSystem).TotalPhysicalMemory / 1GB))
 if ($Parallel -gt 0) {
     $translatorThreads = $Parallel
     $translatedJobs = $Parallel
     $globalJobs = $Parallel
 } else {
+    $memoryGiB = [math]::Max(1, [math]::Floor(
+        (Get-CimInstance Win32_ComputerSystem).TotalPhysicalMemory / 1GB))
     $translatorThreads = [math]::Max(1, [math]::Min([Environment]::ProcessorCount, 16))
     $translatedJobs = [math]::Max(1, [math]::Min([Environment]::ProcessorCount,
         [math]::Floor($memoryGiB / 2)))

Launcher/WiiCompiled.Setup.Windows/InstalledLayout.cs

@@ -27,7 +27,7 @@ internal static class InstalledLayout
     public static readonly string[] DependencyNames =
     [
         "abseil-cpp", "cppwinrt", "dawn_prebuilt", "fmt", "freetype", "imgui", "libusb", "native_prebuilt",
-        "png", "SDL", "sqlite3", "tracy", "xxhash", "zlib", "zstd"
+        "openxr", "png", "SDL", "sqlite3", "tracy", "xxhash", "zlib", "zstd"
     ];
 }