style: cargo fmt --all — make codebase rustfmt-clean

First run of the build-and-test CI gate (cargo fmt --all -- --check) surfaced
pre-existing formatting drift across the agent and server crates. Apply rustfmt
across the workspace so the codebase meets its own CI gate. Pure formatting; no
logic changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agent/src/transport/websocket.rs

@@ -103,11 +103,7 @@ impl WebSocketTransport {
                 let mut stream = stream.lock().await;
 
                 // Use try_next for non-blocking receive
-                match tokio::time::timeout(
-                    std::time::Duration::from_millis(1),
-                    stream.next(),
-                )
-                .await
+                match tokio::time::timeout(std::time::Duration::from_millis(1), stream.next()).await
                 {
                     Ok(Some(Ok(ws_msg))) => Ok(Some(ws_msg)),
                     Ok(Some(Err(e))) => Err(anyhow::anyhow!("WebSocket error: {}", e)),