tests/gateway/test_reply_to_injection.py::test_reply_prefix_injected_when_text_absent_from_history
tests/gateway/test_reply_to_injection.py::test_reply_prefix_still_injected_when_text_in_history
tests/gateway/test_reply_to_injection.py::test_own_message_reply_prefix_marks_assistant_message
tests/gateway/test_reply_to_injection.py::test_no_prefix_without_reply_context
tests/gateway/test_reply_to_injection.py::test_no_prefix_when_reply_to_text_is_empty
tests/gateway/test_reply_to_injection.py::test_reply_snippet_truncated_to_500_chars