Both pass runners do nothing once the loop's context is cancelled, so
a stop no longer starts an eviction pass after a cancelled
reconciliation or on a pending write-pressure wakeup or tick. In
evictBatch, a candidate that fails after cancellation ends the batch
with the context's error instead of logging its own warning; this
replaces the check before each candidate, since every candidate
started after cancellation fails at its first database call. A stop
now logs at most one warning.
Model: opus-5-5