[stooit]

Summary

• calculator: divide throws on division by zero
• date-utils: formatRelative day rounding off-by-one fixed (symmetric past/future)
• string-utils: implemented truncate (word boundary, ellipsis counts toward maxLength, never exceeds maxLength); wordCount handles repeated whitespace
• task-manager: implemented remove, update (whitelists title/description/priority), sortBy (priority/status/createdAt)
• validator: isEmail accepts long TLDs; isUrl accepts ports
• Removed stale TODO/BUG comments

Verification

bun test: 60 pass, 0 fail (was 44/16). tsc --noEmit clean. Reviewed twice, no critical/high issues.

Assumptions

• Sort orders: priority high→low, status pending→in_progress→completed, createdAt oldest first.
• truncate with maxLength < 3 returns a hard slice without ellipsis.
• No test files modified, no dependencies added.