docs(customize): clarify agent permission rules - #11141

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: Kilo-Org/paths-filter@668c092af3649c4b664c54e4b704aa46782f6f7c. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/