fix: tolerate trailing stream audio decode failures

cai

2026-06-29 c54a8b0693fd23a77c1bb8122cdc61ff04007af0

 src/main.rs

@@ -1377,6 +1377,20 @@
                );
                return Ok(0);
            }
            Err(error) if state.first_audio_frame_written => {
                warn!(
                    call_id = %call_id,
                    trace_id = %trace_id,
                    turn_id = %turn.turn_id,
                    chunk_seq = audio_chunk.chunk_seq.unwrap_or_default(),
                    format = %format,
                    buffered_bytes = state.encoded_audio_buffer.len(),
                    error = %safe_error(&error.to_string()),
                    "runtime helper stream_audio_final_chunk_decode_ignored"
                );
                state.encoded_audio_buffer.clear();
                return Ok(0);
            }
            Err(error) => return Err(error).context("failed to decode final stream audio chunk"),
        }
    } else {