resolve.go had grown to 796 lines doing four jobs: working out what a
machine should run, applying settings, collecting contributions, and
placing credentials. They answer different questions — the first is
"what", the rest are "what does that look like as resources" — and one
file doing both is how a thing starts becoming the kernel everything
imports.
Prompted by looking at why HAL's shared library became unmaintainable.
Measured while here, and the shape is the inverse of that one: the large
packages import nothing internal, and only inventory and link compose. A
change to module resolution cannot reach connectivity, because
connectivity does not import it.
