New Issue: [Feature Request]: add 'mason build --prereqs' to only build the requested prereqs

28207, "jabraham17", "[Feature Request]: add 'mason build --prereqs' to only build the requested prereqs", "2025-12-15T20:58:29Z"

Request to add a new flag to mason build, mason build --prereqs, to only build the prerequisites and not the full mason library

This would allow building the prereqs preemptively in something like a CI environment, to save build time