fix(tools): code-review polish — 4 fixes from PR #4 reviewer 907a373 laharikarumanchi Claude Opus 4.7 (1M context) commited on Jun 6
feat(tools): datetime_tool (years_between / add_years / day_of_week) d43510f laharikarumanchi Claude Opus 4.7 (1M context) commited on Jun 5