fix(simulation): Clippy cleanup and CI enforcement (#635)

Fix all Clippy warnings across the server codebase (2411 insertions, 1341
deletions). Raise type-complexity-threshold to 750 and too-many-arguments
to 12 in .clippy.toml for idiomatic Bevy ECS system signatures. The server
now passes `cargo clippy -- --deny warnings` cleanly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/bridge/tcp.rs

@@ -137,10 +137,16 @@ impl SimBridge for TcpBridge {
         // Toggle to blocking for reliable startup message read.
         // The client sends StartupMessage immediately after handshake validation,
         // so this read should complete quickly.
-        reader.get_mut().set_nonblocking(false).map_err(BridgeError::Io)?;
+        reader
+            .get_mut()
+            .set_nonblocking(false)
+            .map_err(BridgeError::Io)?;
         let result = read_framed(reader.get_mut());
         // Restore non-blocking for the tick loop
-        reader.get_mut().set_nonblocking(true).map_err(BridgeError::Io)?;
+        reader
+            .get_mut()
+            .set_nonblocking(true)
+            .map_err(BridgeError::Io)?;
         match result? {
             Some(payload) => {
                 let msg: super::StartupMessage = rmp_serde::from_slice(&payload)?;