codex: fix optional multi-agent CI failures

codex-rs/core/src/agent/control.rs

@@ -378,6 +378,7 @@ impl AgentControl {
         })
     }
 
+    #[allow(clippy::too_many_arguments)]
     async fn spawn_forked_thread(
         &self,
         state: &Arc<ThreadManagerState>,

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

@@ -827,7 +827,7 @@ pub struct Config {
     /// Maximum number of agent threads that can be open concurrently.
     pub agent_max_threads: Option<usize>,
     /// User-configured legacy thread limit before applying the locked multi-agent runtime.
-    pub(crate) configured_agent_max_threads: Option<usize>,
+    pub configured_agent_max_threads: Option<usize>,
     /// Maximum runtime in seconds for agent job workers before they are failed.
     pub agent_job_max_runtime_seconds: Option<u64>,
 

codex-rs/core/src/thread_manager.rs

@@ -1232,9 +1232,7 @@ impl ThreadManagerState {
 
         let multi_agent_version = inherited_multi_agent_version
             .unwrap_or_else(|| config.multi_agent_version_from_features());
-        let Some(multi_agent_version) = multi_agent_version else {
-            return None;
-        };
+        let multi_agent_version = multi_agent_version?;
         let source_thread_id = match initial_history {
             InitialHistory::Resumed(resumed) => Some(resumed.conversation_id),
             InitialHistory::Forked(_) => forked_from_thread_id,

codex-rs/core/src/thread_manager_tests.rs

@@ -900,7 +900,7 @@ async fn legacy_resume_continues_when_multi_agent_version_seed_fails() {
         Arc::new(codex_exec_server::EnvironmentManager::default_for_tests()),
         empty_extension_registry(),
         /*analytics_events_client*/ None,
-        thread_store,
+        Arc::clone(&thread_store),
         /*state_db*/ None,
         TEST_INSTALLATION_ID.to_string(),
         /*attestation_provider*/ None,

codex-rs/thread-manager-sample/src/main.rs

@@ -224,6 +224,7 @@ fn new_config(model: Option<String>, arg0_paths: Arg0DispatchPaths) -> anyhow::R
         project_doc_fallback_filenames: Vec::new(),
         tool_output_token_limit: None,
         agent_max_threads: Some(6),
+        configured_agent_max_threads: Some(6),
         agent_job_max_runtime_seconds: None,
         agent_interrupt_message_enabled: false,
         agent_max_depth: 1,