fix: narrow exception catches in PingGuestAgent and ImportPveOvaCmdlet

Co-authored-by: GoodOlClint <151449+GoodOlClint@users.noreply.github.com>
Agent-Logs-Url: https://github.com/GoodOlClint/PSProxmoxVE/sessions/e7930807-5536-4c55-96f8-0712aee44e00

src/PSProxmoxVE.Core/Services/VmService.cs

@@ -550,8 +550,9 @@ namespace PSProxmoxVE.Core.Services
                 client.PostAsync($"nodes/{Uri.EscapeDataString(node)}/qemu/{vmid}/agent/ping").GetAwaiter().GetResult();
                 return true;
             }
-            catch (Exception ex) when (ex is not OutOfMemoryException and not StackOverflowException)
+            catch (PSProxmoxVE.Core.Exceptions.PveApiException)
             {
+                // Treat API-level failures for this endpoint as "guest agent not responding".
                 return false;
             }
             finally

src/PSProxmoxVE/Cmdlets/Vms/ImportPveOvaCmdlet.cs

@@ -2,8 +2,10 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Management.Automation;
+using System.Net;
 using Newtonsoft.Json.Linq;
 using PSProxmoxVE.Core.Client;
+using PSProxmoxVE.Core.Exceptions;
 using PSProxmoxVE.Core.Models.Vms;
 using PSProxmoxVE.Core.Services;
 
@@ -274,9 +276,9 @@ namespace PSProxmoxVE.Cmdlets.Vms
                 var vm = vmService.GetVm(session, Node, vmId);
                 WriteObject(vm);
             }
-            catch (Exception ex) when (ex is not OutOfMemoryException and not StackOverflowException)
+            catch (PveApiException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
             {
-                // If the VM isn't queryable yet (e.g. disk import still running), return basic info
+                // VM not yet queryable (e.g. disk import still in progress); return basic info
                 WriteVerbose($"VM retrieval failed, returning basic info: {ex.Message}");
                 WriteObject(new PveVm
                 {