Twelve test classes existed twice, under a neutral name and under an internal
inventory name, ~4,600 duplicated lines. Two copies of the same proof diverge
silently: one receives a repair and the other does not - which is exactly what
happened once, and what the cache-hygiene test below documents. The neutral
names survive; per pair the test counts are identical, and the only code
difference (a warm-up window constant) exercises the same path and the same
assertion. The cache-hygiene reproduction now runs the surviving class's
lifecycle, unchanged in what it asserts.
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