flake: Expose lib as an output For some reason I thought this triggered an error during `nix flake check`. Turns out it only emits a warning, so we can now properly access `lib` without having to import it ourselves now.
flake: Compose new and patched packages into a single overlay
Redefine package set on top of overlays I wanted to reduce duplication, but ended up somewhat in the same place (with manifest.nix). Yet I find it much more elegant.