Proposed spec to share SKILL and "loop"/"Workflow" by OCI registry

Sharing skills is always messy, auth, audit, versioning, ...

Some people were already thinking about leveraging OCI registries to do that; I extended the idea with a notion of "workflow/loop" to structure the concept of Loop Engineering.

Everything is versioned and has dependencies.

A user can install, with a single command, the complete collection of skills and workflows their team uses, and it's versioned!

Glad to take a review and feedback; a first implementation started and is showing great result/usage.