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/vitest.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from "vitest/config";
+
+/**
+ * Engine tests run in plain Node, not jsdom.
+ *
+ * This config deliberately omits vite-plugin-solid: it switches the test
+ * environment to jsdom for component testing, and the systems under test here
+ * (physics, mover, sensors) touch no DOM. box3d-wasm is isomorphic, so these
+ * exercise the same wasm the browser loads.
+ */
+export default defineConfig({
+  test: {
+    environment: "node",
+    include: ["src/**/*.test.ts"],
+    testTimeout: 30_000,
+  },
+});