Fuchsia's integration interface is the interface between the Fuchsia platform
and any infrastructure that builds and tests Fuchsia. It is encapsulated as the
interface of the tool fint (/'fɪnt/, fuchsia integration).
TODO(fxbug.dev/10428, fxbug.dev/10429): fint is under simulateous and iterative
design and developement. As it is extended, keep its interface documented and
up-to-date here.