Includes disk size in VHDX cache validation

Prevents reusing cached images when the requested disk size changes. Ensures the disk size property is properly saved and verified against existing cache items to maintain configuration accuracy.

FFUDevelopment/BuildFFUVM.ps1

@@ -580,6 +580,7 @@ class VhdxCacheUpdateItem {
 class VhdxCacheItem {
     [string]$VhdxFileName = ""
     [uint32]$LogicalSectorSizeBytes = ""
+    [uint64]$Disksize = ""
     [string]$WindowsSKU = ""
     [string]$WindowsRelease = ""
     [string]$WindowsVersion = ""
@@ -6418,6 +6419,10 @@ try {
                     if ($vhdxCacheItem.WindowsRelease -ne $WindowsRelease) { WriteLog 'WindowsRelease mismatch, continuing'; continue }
                     if ($vhdxCacheItem.WindowsVersion -ne $WindowsVersion) { WriteLog 'WindowsVersion mismatch, continuing'; continue }
                     if ($vhdxCacheItem.OptionalFeatures -ne $OptionalFeatures) { WriteLog 'OptionalFeatures mismatch, continuing'; continue }
+                    if ($vhdxCacheItem.PSObject.Properties.Name -notcontains 'Disksize') { WriteLog 'Disksize missing in cached config, continuing'; continue }
+                    [uint64]$cachedDisksize = 0
+                    if (-not [uint64]::TryParse([string]$vhdxCacheItem.Disksize, [ref]$cachedDisksize)) { WriteLog "Disksize invalid in cached config ($($vhdxCacheItem.Disksize)), continuing"; continue }
+                    if ($cachedDisksize -ne $Disksize) { WriteLog "Disksize mismatch (cached: $cachedDisksize, current: $Disksize), continuing"; continue }
 
                     $cachedUpdateNames = @()
                     if ($vhdxCacheItem.IncludedUpdates -and $vhdxCacheItem.IncludedUpdates.Count -gt 0) {
@@ -6885,6 +6890,7 @@ try {
         }
         $cachedVHDXInfo.VhdxFileName = $("$VMName.vhdx")
         $cachedVHDXInfo.LogicalSectorSizeBytes = $LogicalSectorSizeBytes
+        $cachedVHDXInfo.Disksize = $Disksize
         $cachedVHDXInfo.WindowsSKU = $WindowsSKU
         $cachedVHDXInfo.WindowsRelease = $WindowsRelease
         $cachedVHDXInfo.WindowsVersion = $WindowsVersion