Add Codex target commands and session routing

tests/test_config.py

@@ -8,6 +8,7 @@ from lazy_enter.config import Config
 def test_config_defaults():
     config = Config()
     assert config.tmux_session_name == "claude"
+    assert config.codex_tmux_session_name == "codex"
     assert config.pty_read_timeout == 5
     assert config.output_buffer_interval == 2.0
     assert config.max_message_length == 3000