@claude review

The change is focused and correct. A few observations:

Code change: The conditional log level is the right approach — DEBUG for routine cleanup, INFO only for named session termination. The wording "Stateless request completed, cleaning up transport" is much clearer than "Terminating session: None".

Test: Well-structured and mirrors the existing test_stateless_requests_memory_cleanup pattern in the file. Using caplog.at_level(logging.DEBUG, ...) to capture the debug message is correct.

One minor nit: the del message in mock_send is a bit unusual — pass or ... is more idiomatic for a stub that just suppresses lint. Non-blocking though.

For context: #1696 / #1697 is a docs PR covering stateless mode semantics more broadly — this fix and that documentation would complement each other well for users trying to understand what stateless mode does and doesn't do.