Extract versioned Model Delivery shared contracts

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@model/shared",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js",
+      "default": "./dist/index.js"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "typecheck": "tsc --noEmit",
+    "test": "pnpm build && node --test tests/*.test.mjs",
+    "check:dist": "pnpm build && git diff --exit-code -- dist"
+  },
+  "dependencies": {
+    "zod": "4.5.4"
+  },
+  "packageManager": "pnpm@10.10.0",
+  "engines": {
+    "node": ">=22.12 <23",
+    "pnpm": ">=10 <11"
+  },
+  "devDependencies": {
+    "typescript": "5.9.3"
+  }
+}