localapi.BackupArchiveLister is satisfied by a runtime type assertion in
newestArchiveOn; a failed assertion degrades SILENTLY to archiveAbsent, which is
the pre-R-84 in-memory-only behaviour — i.e. the R-84 bug returning with nothing
in any log to say so. There was no compile-time witness anywhere in production
code in either repo.
No defect found: *BackupRunner does satisfy it today, so this is a guard, not a
fix. Verified the guard works — breaking NewestArchiveTime's signature now fails
go build, where before it compiled and vetted clean.
No version bump, no deploy: compile-time only, zero runtime effect.
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