feat: auto-check for updates 30s after startup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

MosswartMassacre/PluginCore.cs

@@ -66,6 +66,7 @@ namespace MosswartMassacre
         private static Timer vitalsTimer;
         private static System.Windows.Forms.Timer commandTimer;
         private static Timer characterStatsTimer;
+        private static Timer _updateCheckTimer;
         private static readonly Queue<string> pendingCommands = new Queue<string>();
         private static RareTracker _staticRareTracker;
         public static bool RareMetaEnabled
@@ -198,6 +199,12 @@ namespace MosswartMassacre
                     commandTimer.Dispose();
                     commandTimer = null;
                 }
+                if (_updateCheckTimer != null)
+                {
+                    _updateCheckTimer.Stop();
+                    _updateCheckTimer.Dispose();
+                    _updateCheckTimer = null;
+                }
 
                 // Initialize kill tracker (owns the 1-sec stats timer)
                 _killTracker = new KillTracker(
@@ -296,6 +303,17 @@ namespace MosswartMassacre
                     }
                 }
 
+                // Auto-update: check for updates 30s after startup
+                _updateCheckTimer = new Timer(30000);
+                _updateCheckTimer.AutoReset = false;
+                _updateCheckTimer.Elapsed += (s, ev) =>
+                {
+                    Task.Run(() => UpdateManager.CheckAndInstallAsync());
+                    _updateCheckTimer?.Dispose();
+                    _updateCheckTimer = null;
+                };
+                _updateCheckTimer.Start();
+
             }
             catch (Exception ex)
             {
@@ -361,6 +379,13 @@ namespace MosswartMassacre
                     characterStatsTimer = null;
                 }
 
+                if (_updateCheckTimer != null)
+                {
+                    _updateCheckTimer.Stop();
+                    _updateCheckTimer.Dispose();
+                    _updateCheckTimer = null;
+                }
+
                 // Dispose quest manager
                 if (questManager != null)
                 {