test_expired_own_prompt_notifies_instead_of_unknown_command asserted the
expiry notice synchronously after _consume_prompt_response returned. The
notice now rides a background task (read-loop self-deadlock fix: awaiting
a send from the prompt_response handler blocks the very read loop that
resolves the send's result future), so the test yields one tick before
asserting egress. Behavior contract unchanged: exactly one notice, no
chat dispatch.
Victor Kyriazakos
d4f7c2dbe4