Initial public release of PSX Adventure Engine

Browser reference stack for PSX-era third-person adventure: fixed cameras,
inventory puzzles, Box3D physics, host-authoritative P2P co-op, and a modular
character harness. Ships the Ashgrove Precinct Level 1 investigation demo with
a full cast and nine linked rooms.

client/src/index.tsx

@@ -0,0 +1,9 @@
+/* @refresh reload */
+import { render } from "solid-js/web";
+import App from "./ui/App.jsx";
+import "./styles/index.css";
+
+const root = document.getElementById("root");
+if (!root) throw new Error("Missing #root element");
+
+render(() => <App />, root);