[stooit]

Summary

• divide throws on division by zero
• Implemented truncate (word boundary, ... counts toward maxLength); wordCount handles repeated whitespace
• formatRelative rounds days (36h → "2 days ago")
• isEmail accepts long TLDs; isUrl accepts ports
• Implemented TaskManager.remove, update, sortBy

All 60 tests pass (bun test). No test files or dependencies changed.

Assumptions

• sortBy("status") order (untested): pending → in_progress → completed.
• Review notes (non-blocking): future-date day rounding is asymmetric for negative halves; stale // BUG: comments remain in validator.ts.