Fix agent config handler registration, remove debug prints, disable RabbitMQ heartbeats (#764)

- Fix agent react and orchestrator services appending bare methods
  to config_handlers instead of using register_config_handler() —
  caused 'method object is not subscriptable' on config notify
- Add exc_info to config fetch retry logging for proper tracebacks
- Remove debug print statements from collection management
  dispatcher and translator
- Disable RabbitMQ heartbeats (heartbeat=0) to prevent broker
  closing idle producer connections that can't process heartbeat
  frames from BlockingConnection

trustgraph-base/trustgraph/messaging/translators/collection.py

@@ -79,7 +79,6 @@ class CollectionManagementResponseTranslator(MessageTranslator):
     def encode(self, obj: CollectionManagementResponse) -> Dict[str, Any]:
         result = {}
 
-        print("COLLECTIONMGMT", obj, flush=True)
 
         if obj.error is not None:
             result["error"] = {
@@ -99,6 +98,4 @@ class CollectionManagementResponseTranslator(MessageTranslator):
                     "tags": list(coll.tags) if coll.tags else []
                 })
 
-        print("RESULT IS", result, flush=True)
-
         return result