feat(agents): advertise declared agent variables in agent__list_available

src/config/mod.rs

@@ -28,7 +28,7 @@ pub(crate) use self::agent::AgentConfig;
 pub(crate) use self::agent::default_max_agent_depth;
 pub use self::agent::{
     Agent, AgentVariable, AgentVariables, complete_agent_variables, list_agents,
-    list_agents_with_descriptions,
+    list_agents_with_descriptions, load_agent_variables,
 };
 #[allow(unused_imports)]
 pub use self::app_config::AppConfig;