Address TrafficControllerProxy review feedback

Co-authored-by: emiltin <66034+emiltin@users.noreply.github.com>

Author: Copilot

lib/rsmp/node/supervisor/modules/connection.rb

@@ -87,7 +87,7 @@ def retrieve_site_id(protocol)
 
         def setup_proxy(proxy, settings, id)
           if proxy
-            raise ConnectionError, "Site #{id} alredy connected from port #{proxy.port}" if proxy.connected?
+            raise ConnectionError, "Site #{id} already connected from port #{proxy.port}" if proxy.connected?
 
             proxy.revive settings
           else

lib/rsmp/node/supervisor/supervisor.rb

@@ -60,7 +60,7 @@ def stop
 
     def build_proxy(settings)
       proxy_type = settings[:proxy_type] || @supervisor_settings['proxy_type']
-      return TrafficControllerProxy.new(settings) if proxy_type == 'tlc'
+      return RSMP::TLC::TrafficControllerProxy.new(settings) if proxy_type == 'tlc'
 
       SiteProxy.new settings
     end

lib/rsmp/tlc/traffic_controller_proxy.rb

@@ -128,7 +128,7 @@ def fetch_signal_plan(options: {})
 
       # Override close to clean up subscriptions.
       def close
-        unsubscribe_all
+        unsubscribe_all if respond_to?(:unsubscribe_all, true)
         super
       end