b9f533af0a
Adds a test that fails without the gateway fix, exercising the response_transformed=True branch in _finalize_response: a streamed response whose final text was modified by a transform_llm_output plugin hook must be edit_message'd in place (not duplicate-sent), with already_sent=True so the normal final-send is skipped. Also drops two minor leftovers from the salvaged PR #29119: * accumulated_text property on GatewayStreamConsumer (unused) * duplicate _response_transformed=False inside the hook try block