perf(maestro): disable Nagle on the daemon listener

Keystrokes and PTY echo are tiny frames. With Nagle on, each can sit up to
40ms waiting for an ACK before the kernel sends it — invisible over
loopback, plainly felt from another device on the LAN.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

crates/maestro-daemon/src/cli.rs

@@ -114,6 +114,7 @@ async fn run(config_override: Option<PathBuf>) -> Result<(), Box<dyn Error>> {
     };
 
     axum::serve(listener, router)
+        .tcp_nodelay(true)
         .with_graceful_shutdown(shutdown)
         .await?;
     Ok(())