feat: add es-toolkit dependency to multiple package.json files

app/game-engine/package.json

@@ -18,6 +18,7 @@
         "@sammo-ts/infra": "workspace:*",
         "@sammo-ts/logic": "workspace:*",
         "@prisma/client": "^7.2.0",
+        "es-toolkit": "^1.39.0",
         "zod": "^4.2.1"
     },
     "devDependencies": {