Lambda Spec: Always depend on the resolution of capture vars

Given an inference bound like

z <: Foo<t>

Where 'z' is a capture var, it should be the case that 't' depends on the resolution of 'z'. (This is unusual -- usually the dependency goes the other direction, with 'z' depending on 't'.)

Currently, no dependency between the two is specified.

Fortunately, incorporation passes most useful information from 'z' to 't' anyway, but not always:

interface PonyList<T extends Pony> extends List<T> {}
PonyList<z> = capture(PonyList<? extends x>)
z <: Bar<t>