dumpListeners method
Debug method to dump current listener state
Implementation
String dumpListeners() {
if (_listeners.isEmpty) return 'No active listeners';
final buffer = StringBuffer();
buffer.writeln('=== REACTIVE SYSTEM STATE ===');
buffer.writeln('Total listener groups: ${_listeners.length}');
for (final entry in _listeners.entries) {
buffer.writeln('${entry.key}: ${entry.value.length} listeners');
}
final stats = getMemoryStats();
buffer.writeln('\nStatistics: $stats');
return buffer.toString();
}