Scaffold monorepo: engine, server, and web packages

npm workspaces with three TypeScript packages: @wizwar/engine (pure
game logic), @wizwar/server (Node websocket authority), @wizwar/web
(Svelte 5 + Vite client). Server handshake and client build verified.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/server/src/index.ts

@@ -0,0 +1,14 @@
+import { WebSocketServer } from "ws";
+
+const port = Number(process.env.PORT ?? 8787);
+const wss = new WebSocketServer({ port });
+
+wss.on("connection", (socket) => {
+  socket.send(JSON.stringify({ type: "hello", game: "wizwar" }));
+  socket.on("message", (data) => {
+    // TODO: route client commands into game rooms once the engine exists.
+    console.log("received:", data.toString());
+  });
+});
+
+console.log(`wizwar server listening on ws://localhost:${port}`);