feat: keep dev server alive during HMR updates

packages/dev-server/src/runtime.ts

@@ -410,8 +410,8 @@ export const STYLES_HREF = "/__wrnexus/styles.css";
 /**
  * Inline HMR client (WebSocket). Goals:
  *  - CSS change  -> hot-swap the stylesheet, zero reload, zero flash.
- *  - markup/page -> after the server restarts, ask over the HMR WebSocket for
- *    fresh HTML and MORPH the live DOM in place.
+ *  - markup/page -> ask over the existing HMR WebSocket for fresh HTML and
+ *    MORPH the live DOM in place, without restarting the server.
  *  - island code -> same WebSocket sync path; no location.reload().
  */
 export const HMR_CLIENT_JS = `