Follow-up on the cherry-picked fix: _defer_update_notice no longer takes the Rich console it
can never safely use (the notice always lands after patch_stdout owns stdout), the unit test
asserts the contract at prompt_toolkit's boundary (an ANSI fragment reaches
print_formatted_text, with no raw ESC/markup in the visible text) instead of patching our own
cprint, and evals/cli_deferred_notice.py drives the real CLI under a Linux PTY with a FIFO-gated
update cache to A/B the late-notice cases (garbled on base, clean after).
3a15c39e8e