fix: add debug logging for dungeon_map sends, guard COM exceptions

- Log dungeon_map payload size and send success/failure
- Guard early COM calls (CharacterFilter, Actions.Heading) with
  try/catch to prevent RPC_E_SERVERFAULT during state transitions

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

MosswartMassacre/NearbyObjectsTracker.cs

@@ -104,8 +104,21 @@ namespace MosswartMassacre
                 var dungeonMap = _dungeonMapReader.ReadDungeonMap(landcell, characterName);
                 if (dungeonMap != null)
                 {
-                    var json = JsonConvert.SerializeObject(dungeonMap);
-                    await WebSocket.SendDungeonMapAsync(json);
+                    try
+                    {
+                        var json = JsonConvert.SerializeObject(dungeonMap);
+                        _logger?.Log($"[Radar] Sending dungeon_map ({json.Length} bytes) for 0x{landblock:X8}");
+                        await WebSocket.SendDungeonMapAsync(json);
+                        _logger?.Log($"[Radar] dungeon_map sent successfully");
+                    }
+                    catch (Exception ex)
+                    {
+                        _logger?.Log($"[Radar] dungeon_map send failed: {ex.Message}");
+                    }
+                }
+                else
+                {
+                    _logger?.Log($"[Radar] ReadDungeonMap returned null for 0x{landblock:X8} (already cached or not a dungeon)");
                 }
             }
         }
@@ -114,11 +127,20 @@ namespace MosswartMassacre
         {
             try
             {
+                // Guard against COM exceptions during state transitions
+                string characterName;
+                int playerId;
+                double playerHeading;
+                try
+                {
+                    characterName = CoreManager.Current.CharacterFilter.Name;
+                    playerId = CoreManager.Current.CharacterFilter.Id;
+                    playerHeading = CoreManager.Current.Actions.Heading;
+                }
+                catch { return null; }
+
                 var playerCoords = Coordinates.Me;
                 var playerRawPos = Utils.GetPlayerPosition();
-                double playerHeading = CoreManager.Current.Actions.Heading;
-                string characterName = CoreManager.Current.CharacterFilter.Name;
-                int playerId = CoreManager.Current.CharacterFilter.Id;
                 uint landcell = Utils.GetPlayerLandcell();
                 uint landblock = landcell & 0xFFFF0000;