chore: enforce pnpm minimum release age and upgrade to v10.33.0 (#266)

- Add minimum-release-age=10080 (7 days) and ignore-scripts=true to .npmrc
- Upgrade pnpm from 10.12.1 to 10.33.0 (minimumReleaseAge requires >= 10.16.0)
- Document package installation age policy in CLAUDE.md

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "private": true,
   "type": "module",
-  "packageManager": "pnpm@10.12.1",
+  "packageManager": "pnpm@10.33.0",
   "scripts": {
     "build": "turbo run build",
     "check": "turbo run check",