Add local Windows Server inventory collection and validation; include core package

powershell/Get-ServerRoles.ps1

@@ -0,0 +1,10 @@
+function Get-SamsaraRoles {
+    param($Result)
+    Invoke-SamsaraRead $Result 'Server roles and features' {
+        $Result.data = @(Get-WindowsFeature -ErrorAction Stop | Where-Object { $_.Installed } | ForEach-Object {
+            [pscustomobject]@{ name = [string]$_.Name; display_name = [string]$_.DisplayName
+                state = [string]$_.InstallState; feature_type = [string]$_.FeatureType }
+        })
+    }
+    $Result.limitations += 'Installed roles/features only; installed state does not prove current use. Requires local ServerManager availability.'
+}