feat(windows): automate OOBE region/keyboard (oobeSystem International-Core)

VM run reached OOBE but the region/keyboard pages were still interactive: the
oobeSystem pass lacked Microsoft-Windows-International-Core, so 24H2 OOBE
(CloudExperienceHost) prompted for them even under legacy Setup. Add it +
HideOEMRegistrationScreen + HideLocalAccountScreen so OOBE is fully hands-off to
the local account / desktop.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

windows/installer/autounattend/autounattend.xml

@@ -61,11 +61,24 @@
   </settings>
 
   <settings pass="oobeSystem">
+    <!-- Pre-answer the OOBE region/keyboard pages (CloudExperienceHost). Without
+         International-Core in the oobeSystem pass, 24H2 OOBE prompts for these
+         interactively even under legacy Setup. -->
+    <component name="Microsoft-Windows-International-Core" processorArchitecture="amd64"
+               publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
+      <InputLocale>0809:00000809</InputLocale>
+      <SystemLocale>en-GB</SystemLocale>
+      <UILanguage>en-GB</UILanguage>
+      <UILanguageFallback>en-GB</UILanguageFallback>
+      <UserLocale>en-GB</UserLocale>
+    </component>
     <component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64"
                publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
       <OOBE>
         <HideEULAPage>true</HideEULAPage>
+        <HideOEMRegistrationScreen>true</HideOEMRegistrationScreen>
         <HideOnlineAccountScreens>true</HideOnlineAccountScreens>
+        <HideLocalAccountScreen>true</HideLocalAccountScreen>
         <HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
         <ProtectYourPC>3</ProtectYourPC>
       </OOBE>