The Agency HQ (https://theagencyhq.dev) is another approach that uses a central repository of skills, rules, and other files that are pushed down to developer machines and then placed into project directories as needed. It uses a simple daemon on to pull down the files and distribute them. And it supports filtering and translation for most of the popular agents.
Disclaimer, I wrote The Agency and it is in early stages. I'd love feedback if anyone gives it a test drive.