Restore Generator Free Constraint Addition

[pulsipher]

Fixes #285.

[github-actions]

Your PR requires formatting changes to meet the project's style guidelines.

Please run:

julia --project=@runic -e 'using Pkg; Pkg.add("Runic")'
julia --project=@runic -e "using Runic; exit(Runic.main(ARGS))" -- --fix <files>

(or git runic main if you have the git wrapper installed)

Note: the full diff is omitted because it can exceed GitHub Actions input limits.