Three tasks that turned 'can PLN play from another laptop' from a question into
a procedure, archived long-form because the learnings are the blog material.

The through-line worth reading later: every one of the three had a structural
flaw that only appeared when you asked where the tool would RUN. sample-pack was
designed as two bundles until PLN reframed it as one parameterized query over the
mapped list. rig-doctor was green at home and structurally incapable of naming
absence on a fresh box, because it resolved against the machine it ran on.
rig-install would have created an empty quark directory that the next run reads
as 'already installed'. None of the three was caught by a test; all three were
caught by asking what happens on a machine that has nothing.