Reconcile toolkit-spec.md with shipped batching/cross-linker CLI - #123

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: peter-evans/create-or-update-comment@3383acd359705b10cb1eeef05c0e88c056ea4666, peter-evans/find-comment@034abe94d3191f9c89d870519735beae326f2bdb. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/