v0.18.0

Fixed

• Recognize Russian abbreviated month names such as июл in full date expressions.

Added

• Recognize numeric date literals inside expressions, e.g. 15.10.2025 + 180 days
  and 15/10/2025 + 180 days. Dot- (DD.MM.YYYY, YYYY.MM.DD), slash-, and
  dash-separated dates in day-first, month-first, and ISO orderings are now
  parsed as dates instead of arithmetic (issue #166).

Fixed

• Stop rejecting 15.10.2025 + 180 days with "Unexpected trailing input
  '.2025'" and stop silently evaluating numeric dates such as 15/10/2025 and
  2021-02-08 as division/subtraction. A strict 4-digit-year + valid-calendar
  guard keeps ordinary arithmetic (2026 - 1 - 22, 1/3 * 3, 10/2,
  3.14 + 2.86) untouched.