Before R-86 every tick ran a heavy restore-test, so the scheduler was audible by
construction. After it, 'nothing is due' is the NORMAL outcome — and it was
logged at DEBUG, which journald drops. An empty journal would then be equally
consistent with a healthy loop and a dead goroutine: the shape the R-88 watcher
was retired for, re-created by making the quiet path the common one.
A not-due evaluation now logs one INFO line naming every tier's verdict (four
lines a day at the 6h default), and an unlistable tier reads UNKNOWN with its
error in that same line, so a lookup failure can never present as 'nothing due'.
Red-proved through the scheduler's own tick, not the helper.
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