The page said which machine is safe to break but not when reusing a test box is
legitimate. That distinction is exactly what surfaced R-120: R-116's closing run
deliberately did a real day-0 from the ISO instead of reusing the standing fixture,
and the fresh box installed the golden's controller -- a release behind -- and showed
the customer the wrong absent-target message. A fixture would have shown a controller
nobody installs.
Adds to the Tier 1 section: a reusable snapshot-reset fixture is the right default
for MECHANISM work (payload capture, fix cycles, claims about code behaviour), while
a fresh day-0 from the ISO is REQUIRED for any claim about the install path, the
golden image, agent publish/vouch or first-boot state -- naming the drift family it
exists to catch (R-111, R-115, R-120).
Also: a fixture must record its provenance (which golden, agent and controller, and
when), because a fixture whose versions drift silently is R-120's mechanism turned
into a permanent installation -- worse than no fixture, since it produces confident
wrong results quickly.
Part 1 of the R-120 task, committed alone and before the bake. Docs only.
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