flake.den = den; won't build unless hjem, nix-maid, nixos-wsl etc are declared in flake inputs

[Likivik]

Repro:
0. Use flakes for Nixos config, have one of these disabled in (absent from) flake inputs: nix-maid || nixos-wsl || hjem || probably home-manager or other 'classes'

1. Set flake.den = den; for debugging (as per docs )
2. nix run .#write-flake or nix flake check etc
3. Observe the error

       error: attribute 'nixos-wsl' missing
       at «github:denful/den/25e2c47»/modules/aspects/batteries/wsl.nix:33:17:
           32|       defaultText = lib.literalExpression "inputs.nixos-wsl.nixosModules.default";
           33|       default = inputs.nixos-wsl.nixosModules.default;
             |                 ^
           34|     };

adding flake inputs for corresponding attribute - resolves the issue.

Probably not the most important of issues, but just something I noticed. Used to work in #475 a day or so before the merge.
I also might be totally missing something, I've been messing with my config a loooot. So feel free to tell me that I'm lost:)

[theutz]

Thanks for the note! If I understand correctly what you're trying to say, then yeah, Den will not automatically add any inputs to your flake for you. I don't believe that's a design goal for us. I think some of the docs mention that in some places, but if you were reading about how to install Den somewhere in the docs and it didn't mention that, let us know so we can put a helpful note.