The salvaged change also put notify=True on both approval sends.
On A2A, `notify` marks the turn-final reply, and A2A has no native
approval renderer. A prompt that needs a human decision would therefore
complete the caller's task with the prompt text while the turn is still
waiting (@ehz0ah's review on #132527). Telegram already pushes the
prompt through the approval-aware _notification_kwargs, so only the
is_approval_prompt marker is needed. The card send goes back to the
verbatim thread metadata: Telegram's control-message path never silences
cards.
Tests: the runner test pins that the fallback metadata stays interim and
does not carry notify. The adapter tests become a single parametrize.
Fold the _notification_kwargs change back into the original one-line
shape, so adapter.py grows by one line instead of six.
943d4caa47