Commentary messages (interim assistant status updates like "Using browser
tool...") are sent via _send_commentary(), which was incorrectly setting
_already_sent = True on success. This caused the final response to be
suppressed when there were multiple tool calls, because the gateway checks
already_sent to decide whether to skip re-sending the response.
The fix: commentary messages are interim status updates, not the final
response, so _already_sent should not be set when they succeed. This
ensures the final response is always delivered regardless of how many
commentary messages were sent during the turn.
Fixes: #10454
d4eba82a37