refactor(src): split oversized modules

src/gateway/server/close-reason.ts

@@ -0,0 +1,13 @@
+import { Buffer } from "node:buffer";
+
+const CLOSE_REASON_MAX_BYTES = 120;
+
+export function truncateCloseReason(
+  reason: string,
+  maxBytes = CLOSE_REASON_MAX_BYTES,
+): string {
+  if (!reason) return "invalid handshake";
+  const buf = Buffer.from(reason);
+  if (buf.length <= maxBytes) return reason;
+  return buf.subarray(0, maxBytes).toString();
+}