Clarify Rich tree visualization usage in print_swarm_structure

Added a note about Rich tree visualization limitations for non-HierarchicalSwarm instances.

swarms/utils/formatter.py

@@ -935,6 +935,9 @@ class Formatter:
         """
         Print a visual tree representation of a nested swarm structure using Rich Tree.
         
+        Note: Rich tree visualization is only available for HierarchicalSwarm instances.
+        Other swarm types will not be visualized.
+
         Args:
             swarm (Any): The root swarm object to visualize.
             title (str): Title to display above the structure. Defaults to "Nested Structure:".
@@ -942,6 +945,12 @@ class Formatter:
         if not swarm:
             return
         
+        # Only use Rich tree for HierarchicalSwarm instances
+        swarm_type_name = type(swarm).__name__
+        if swarm_type_name != "HierarchicalSwarm":
+            # For non-HierarchicalSwarm types, do nothing
+            return
+        
         # Always print title first using regular print to ensure visibility
         print(f"\n{title}")