Earned during v0.191.1's own live validation. After the customer had been
warned, a restart produced ZERO fillwatch lines — equally consistent with
'ran and chose silence' and 'never ran'. Proving the checker was alive
needed a deliberate crossing into the critical band.
For an edge-triggered check the quiet run IS the healthy steady state, so
that ambiguity is permanent rather than rare. Check now logs a per-RUN
summary on every run, counting unreadable separately from healthy so a
drive that has quietly gone unreadable cannot read as 'all fine'.
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