Update to prefer PS7 if available

Elysium.Common.ps1

@@ -0,0 +1,35 @@
+function Restart-WithPwshIfAvailable {
+    param(
+        [hashtable]$BoundParameters,
+        [object[]]$UnboundArguments
+    )
+
+    if ($PSVersionTable.PSVersion.Major -ge 7) { return }
+    $pwsh = Get-Command -Name 'pwsh' -ErrorAction SilentlyContinue
+    if (-not $pwsh) { return }
+    if (-not $PSCommandPath) { return }
+
+    Write-Host ("PowerShell 7 detected at '{0}'; relaunching script under pwsh..." -f $pwsh.Path)
+
+    $argList = @('-NoLogo', '-NoProfile', '-File', $PSCommandPath)
+
+    if ($BoundParameters) {
+        foreach ($entry in $BoundParameters.GetEnumerator()) {
+            $key = "-$($entry.Key)"
+            $value = $entry.Value
+            if ($value -is [System.Management.Automation.SwitchParameter]) {
+                if ($value.IsPresent) { $argList += $key }
+            } else {
+                $argList += $key
+                $argList += $value
+            }
+        }
+    }
+
+    if ($UnboundArguments) {
+        $argList += $UnboundArguments
+    }
+
+    & $pwsh.Path @argList
+    exit $LASTEXITCODE
+}