fix(combat): wire combat tracker in InitializeForHotReload

The combat stats tracker was only started in LoginComplete — but
auto-updates go through InitializeForHotReload() which skipped it
entirely. After every hot reload, _combatStatsTracker was created but
never had SetCombatTracker/RestartSession/Start called.

Also adds vital sharing re-init for the same hot reload path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

MosswartMassacre/PluginCore.cs

@@ -783,7 +783,27 @@ namespace MosswartMassacre
                 WriteToChat($"[ERROR] Quest streaming service hot reload failed: {ex.Message}");
             }
 
-            // 10. Reinitialize character stats streaming
+            // 10. Reinitialize combat stats tracker
+            try
+            {
+                _chatEventRouter.SetCombatTracker(_combatStatsTracker);
+                _combatStatsTracker?.RestartSession();
+                _combatStatsTracker?.Start();
+                WriteToChat($"[OK] Combat stats tracker initialized (tracker={(_combatStatsTracker != null ? "OK" : "NULL")})");
+            }
+            catch (Exception ex)
+            {
+                WriteToChat($"[ERROR] Combat stats hot reload failed: {ex.Message}");
+            }
+
+            // 10b. Reinitialize vital sharing if enabled
+            if (PluginSettings.Instance.VitalSharingEnabled && _vitalSharingTracker != null)
+            {
+                _vitalSharingTracker.Start();
+                WriteToChat("[OK] Vital sharing re-enabled after hot reload");
+            }
+
+            // 11. Reinitialize character stats streaming
             try
             {
                 if (characterStatsTimer == null)