Fix packageManager field to pnpm@10 to match lock file format

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ctrimm

package.json

@@ -8,7 +8,7 @@
   },
   "type": "module",
   "version": "1.0.0",
-  "packageManager": "pnpm@9",
+  "packageManager": "pnpm@10",
   "engines": {
     "node": ">=20"
   },