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/vite.config.ts

@@ -0,0 +1,33 @@
+import { defineConfig } from "vite";
+import solid from "vite-plugin-solid";
+
+/**
+ * box3d-wasm ships two builds and picks one at runtime. The threaded "deluxe"
+ * build needs SharedArrayBuffer, which browsers only expose on a cross-origin
+ * isolated page — hence the COOP/COEP headers below. Without them we silently
+ * fall back to the single-threaded build, which still works but leaves the
+ * multithreaded solver on the table.
+ */
+const crossOriginIsolation = {
+  "Cross-Origin-Opener-Policy": "same-origin",
+  "Cross-Origin-Embedder-Policy": "require-corp",
+};
+
+export default defineConfig({
+  plugins: [solid()],
+  server: {
+    headers: crossOriginIsolation,
+    // Generated characters live in the workspace-root `assets/` directory, which
+    // is outside the client package. One source of truth beats copying GLBs
+    // into `public/` on every harness run.
+    fs: { allow: [".."] },
+  },
+  preview: { headers: crossOriginIsolation },
+  // The threaded build's pthread worker uses top-level await, which cannot be
+  // expressed in Vite's default `iife` worker format.
+  worker: { format: "es" },
+  // Emscripten glue resolves its .wasm via `new URL(..., import.meta.url)`.
+  // Pre-bundling rewrites that URL and breaks the fetch, so keep it external.
+  optimizeDeps: { exclude: ["box3d-wasm"] },
+  build: { target: "es2022" },
+});