Feature Request: Allow users to install the collection of skills, agents etc as a plugin

[clay-good]

Note

Moved from issue #1231, originally opened by @gkourogiorgas on 2026-06-20. Continuing the conversation here in Discussions — the original issue thread (including any comments) stays available at #1231 for the record.

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This way one can turn on or off the whole collection of skills, agents and extras with one click/button press.
One scenario is that when I start a project I am in spec mode so I need all these. When I move to implementation etc I need different set of skills and agents.
Currently if I want to clear the context from openspec agents skills etc I will either have to disable each one or uninstall/remove the framework from the project, which will then mean that when I push it it won't be in the repo

Hope it makes sense