fix:Align runtime to Node 20 LTS and enforce version

.npmrc

@@ -0,0 +1,2 @@
+engine-strict=true
+

.nvmrc

@@ -0,0 +1,2 @@
+20.19.0
+

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

README.md

@@ -54,7 +54,18 @@ Instructions for setting up and running the various scripts locally
 
 ### Prerequisites
 
-Currently runs on Node.js LTS/Gallium v16.20.2
+Requires Node.js 20 LTS (Iron). Recommended: v20.19.0
+
+```bash
+# Tooling setup
+corepack enable
+
+# Use the project version (with nvm)
+nvm use || nvm install 20.19.0 && nvm use 20.19.0
+
+# Sanity check yarn version
+yarn --version
+```
 
 ```bash
 # Install dependencies

package.json

@@ -64,5 +64,10 @@
     "eslint": "^8.52.0",
     "prettier": "^3.0.3",
     "typescript": "^5.2.2"
-  }
-}
+  },
+  "engines": {
+    "node": ">=20.18.0 <21",
+    "yarn": ">=4.0.0 <5"
+  },
+  "packageManager": "[email protected]+sha512.7b1cb0b62abba6a537b3a2ce00811a843bea02bcf53138581a6ae5b1bf563f734872bd47de49ce32a9ca9dcaff995aa789577ffb16811da7c603dcf69e73750b"
+}