Problem: Log messages used inconsistent capitalization, punctuation,
and phrasing — some started lowercase, some omitted periods, "Pending"
was used instead of "task", and sync backend errors used ad-hoc
formatting.
Solution: Apply sentence case after backend prefixes, add trailing
periods to complete sentences, rename "Pending" to "task", use
`'Failed to <verb> <noun>: '` pattern for operation errors, and
pluralize "Archived N task(s)" correctly.
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