[stooit]

Summary

• calculator.divide: throw on division by zero
• string-utils: implement truncate (word boundary, ... counts toward maxLength); wordCount handles repeated whitespace
• date-utils.formatRelative: use Math.round for days (fixes off-by-one)
• validator: isEmail accepts TLDs of 2+ letters; isUrl accepts ports (still http/https only)
• TaskManager: implement remove, update, sortBy

Verification

bun test: 60 pass / 0 fail (was 44/16). tsc --noEmit clean. Reviewed, including a ReDoS check on the new email regex.

Assumptions

• sortBy('status') order is pending → in_progress → completed (tests don't cover it)
• update uses Object.assign; extra runtime keys aren't filtered (type-restricted only)
• No test files modified, no dependencies added