Fix rare detection broken on hot reload / DLL update

InitializeForHotReload() never created a RareTracker — it only ran
if one already existed. When the new DLL is loaded on an already-
logged-in character, LoginComplete doesn't fire, so _rareTracker
stayed null and the null-check in ChatEventRouter.OnChatText silently
skipped all rare detection.

Now InitializeForHotReload creates and wires the RareTracker if it
hasn't been set yet, matching what LoginComplete does.

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

MosswartMassacre/PluginCore.cs

@@ -495,8 +495,16 @@ namespace MosswartMassacre
                 WriteToChat($"[ChestLooter] Initialization failed: {ex.Message}");
             }
 
-            // 2. Apply the values from settings
-            if (_rareTracker != null) _rareTracker.RareMetaEnabled = PluginSettings.Instance.RareMetaEnabled;
+            // 2. Initialize rare tracker if not already set (missed when LoginComplete doesn't fire)
+            if (_rareTracker == null)
+            {
+                _rareTracker = new RareTracker(this);
+                _staticRareTracker = _rareTracker;
+                _chatEventRouter.SetRareTracker(_rareTracker);
+            }
+
+            // Apply the values from settings
+            _rareTracker.RareMetaEnabled = PluginSettings.Instance.RareMetaEnabled;
             WebSocketEnabled = PluginSettings.Instance.WebSocketEnabled;
             CharTag = PluginSettings.Instance.CharTag;