Fix cross-platform line ending handling in LoadVocabulary

Split merges on '\n' and trim '\r' to support both Unix and Windows
line endings. Also filter out comment and blank lines.

RunTinyStories.cs

@@ -130,7 +130,15 @@ public class RunTinyStories : MonoBehaviour
             tokens[item.Value] = item.Key;
         }
 
-        merges = mergesAsset.text.Split("\r\n");
+        var allMerges = mergesAsset.text.Split('\n');
+        var mergeList = new List<string>();
+        foreach (var line in allMerges)
+        {
+            var trimmed = line.TrimEnd('\r');
+            if (trimmed.Length > 0 && trimmed[0] != '#')
+                mergeList.Add(trimmed);
+        }
+        merges = mergeList.ToArray();
     }
 
     // Translates encoded special characters to Unicode