Allow agents.max_threads to work with multi_agent_v2 (#19733)

codex-rs/core/src/config/mod.rs

@@ -2117,13 +2117,6 @@ impl Config {
 
         let history = cfg.history.unwrap_or_default();
 
-        let agent_max_threads_from_config = cfg.agents.as_ref().and_then(|agents| agents.max_threads);
-        if features.enabled(Feature::MultiAgentV2) && agent_max_threads_from_config.is_some() {
-            return Err(std::io::Error::new(
-                std::io::ErrorKind::InvalidInput,
-                "agents.max_threads cannot be set when multi_agent_v2 is enabled",
-            ));
-        }
         let agent_max_threads = cfg
             .agents
             .as_ref()