Banking Kata: Clarification on Clean Architecture

[eamtalu]

Hi,
While I was exploring/learning clean architecture using Banking Kata project, I have come across two below questions.
Appreciate if anybody can clarify please:

1. There is an interface Generator in the Core of the project. Why does it need to create Generator interface in the core and implementation is outside of the core such as in the fake or real directory ?

2. how this pipelinr.send is working and interacting with Core project ?

Thanks.

[eamtalu]

I think, I have got it.

In clean architecture, usecase interacts with DomainEntities only. Therefore, it needs to have an interface in domainentities for any functionality that usecases needs from domain. Whereas, domainentities relies on infrastructure for any implementation details.
My understanding, I could be wrong.
pipelineR is a package that handles command. Instead of pipelinR, we can use normal functional call to usecase method as well. But may be in clean architecture, things like Adapter are needed. Therefore, pipelinR seems to work like an adapter or port.