perf: eliminate loop string allocations and proxy mem spikes

stub/src/main.rs

@@ -96,10 +96,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                             if let tokio_tungstenite::tungstenite::Message::Text(text) = msg {
                                 let log_prefix = logger::extract_log_prefix(&text, true);
                                 tracing::info!("<<< [Stub] Received {} from server (length: {}): {}", log_prefix, text.len(), if text.len() > 1000 { format!("{}...", &text[..1000]) } else { text.clone() });
-                                let payload = format!("{}\n", text);
                                 use tokio::io::AsyncWriteExt;
                                 let mut stdout = tokio::io::stdout();
-                                let _ = stdout.write_all(payload.as_bytes()).await;
+                                let _ = stdout.write_all(text.as_bytes()).await;
+                                let _ = stdout.write_all(b"\n").await;
                                 let _ = stdout.flush().await;
                             }
                         }