fix(deps): update dependency @langchain/core to v1

Author: renovate[bot]

package.json

@@ -4,7 +4,7 @@
     "eoc": "./src/eoc.js"
   },
   "dependencies": {
-    "@langchain/core": "^0.3.55",
+    "@langchain/core": "^1.0.0",
     "@langchain/openai": "^0.6.0",
     "colors": "^1.4.0",
     "commander": "^12.1.0",