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/viewer/transport.rs

@@ -6,23 +6,17 @@ use bytes::Bytes;
 use futures_util::{SinkExt, StreamExt};
 use prost::Message as ProstMessage;
 use std::sync::Arc;
+use tokio::net::TcpStream;
 use tokio::sync::Mutex;
 use tokio_tungstenite::{
-    connect_async,
-    tungstenite::protocol::Message as WsMessage,
-    MaybeTlsStream, WebSocketStream,
+    connect_async, tungstenite::protocol::Message as WsMessage, MaybeTlsStream, WebSocketStream,
 };
-use tokio::net::TcpStream;
 use tracing::{debug, error, trace};
 
-pub type WsSender = futures_util::stream::SplitSink<
-    WebSocketStream<MaybeTlsStream<TcpStream>>,
-    WsMessage,
->;
+pub type WsSender =
+    futures_util::stream::SplitSink<WebSocketStream<MaybeTlsStream<TcpStream>>, WsMessage>;
 
-pub type WsReceiver = futures_util::stream::SplitStream<
-    WebSocketStream<MaybeTlsStream<TcpStream>>,
->;
+pub type WsReceiver = futures_util::stream::SplitStream<WebSocketStream<MaybeTlsStream<TcpStream>>>;
 
 /// Receiver wrapper that parses protobuf messages
 pub struct MessageReceiver {
@@ -88,10 +82,7 @@ pub async fn connect(url: &str, token: &str) -> Result<(WsSender, MessageReceive
 }
 
 /// Send a protobuf message over the WebSocket
-pub async fn send_message(
-    sender: &Arc<Mutex<WsSender>>,
-    msg: &proto::Message,
-) -> Result<()> {
+pub async fn send_message(sender: &Arc<Mutex<WsSender>>, msg: &proto::Message) -> Result<()> {
     let mut buf = Vec::with_capacity(msg.encoded_len());
     msg.encode(&mut buf)?;