chore(repo): initialize planarchy workspace

packages/engine/vitest.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    coverage: {
+      provider: "v8",
+      thresholds: {
+        lines: 95,
+        functions: 95,
+        branches: 90,
+        statements: 95,
+      },
+    },
+  },
+});