remove unused broker/coordinator methods

hive-c0re/src/coordinator.rs

@@ -118,10 +118,6 @@ impl Coordinator {
         }
     }
 
-    pub fn list_agents(&self) -> Vec<String> {
-        self.agents.lock().unwrap().keys().cloned().collect()
-    }
-
     /// Mark an agent as in-progress (only one state per agent for now).
     pub fn set_transient(&self, name: &str, kind: TransientKind) {
         self.transient.lock().unwrap().insert(