Two new tests:
- tests/gateway/test_telegram_format.py
test_message_too_long_splits_into_continuations_not_silent_truncation:
asserts edit_message returns success=True with continuation_message_ids
populated and message_id pointing at the last continuation when
content exceeds MAX_MESSAGE_LENGTH (#19537). Replaces the original
fail-on-overflow assertion with the split-and-deliver contract.
- tests/gateway/test_stream_consumer.py
TestEditOverflowSplitAndDeliver.test_consumer_advances_message_id_on_split_and_deliver:
asserts the consumer side updates _message_id to the latest
continuation, clears _last_sent_text, and fires on_new_message when
the adapter reports a split-and-deliver result.
82352e54c4