Declarative applied capabilities with reused source capabilities

[jlouvel]

As an integration engineer, I need to rightsize my microservices to solve issues like:
￭ Mixing legacy APIs reuse and context engineering concerns
￭ Lower productivity and reuse

By declaring a Naftiko capability, I get those benefits:
￭ Separation of concerns between API reusability and context engineering
￭ Higher productivity and reuse

[eskenazit]

@jlouvel here is the spec proposal to review

[jlouvel]

Thanks @eskenazit ! I added the implementation to this PR
#124