Add thread message delivery

codex-rs/core/tests/suite/mod.rs

@@ -143,6 +143,7 @@ mod sqlite_state;
 mod stream_error_allows_next_turn;
 mod stream_no_completed;
 mod subagent_notifications;
+mod timers;
 mod tool_harness;
 mod tool_parallelism;
 mod tool_suggest;