Optimisation: 40 skills => less skills + references

[IgorWarzocha]

Hi! I love skills. But I also hate how they create issues for agents.

Context pollution is real and I can already see that some of skills included in the repo cross-reference other skills. Problem with this is that the top level skills all get loaded into <available_skills>, and 40 of them, added to any other skills that people use, will make for a really bad experience.

Obviously, one might say that not all of them need to be installed at once, but with how heavy the cross-references are, basically none of them are skippable.

Proposal:

Even if it costs some duplication, bundle the granular skills in a top level structure, with /references/ folder.

I believe this will save both the users and the devs a lot of headaches, and it will be easier for users to manage a situation where they might only need parts of the included skills.