feat: consolidate subagent execution for dynamic tasks (#3444)

Co-authored-by: Lifei Zhou <lifei@squareup.com>

crates/goose-cli/src/session/builder.rs

@@ -203,6 +203,7 @@ pub async fn build_session(session_config: SessionBuilderConfig) -> Session {
 
     // Create the agent
     let agent: Agent = Agent::new();
+
     if let Some(sub_recipes) = session_config.sub_recipes {
         agent.add_sub_recipes(sub_recipes).await;
     }