went
`exec` waited two minutes always. A build, or anything that waits on
another machine, needs longer — and a caller that cannot say so has to
split the work to fit, which is a test shaped by its harness rather than
by what it is testing.
The scenario also places a build machine when one is given, so anything
in it can ask the mesh to build something. Nothing else here would start
one.
And the mesh-runs-its-own-artifact-store test is not here. It needs a
fourth image so the module has a registry to mirror, and that is caught
behind 04-ISSUES/012 — left as a note saying where it went and why,
rather than silently deleted, because what it asserted is worth
asserting.