Changes in version 2.0.0 (2026-09-09)                  

  - Added testthat edition 3 regression coverage for the 168-hour
    allocation, boundary conditions, invalid inputs, timezones, and
    daylight-saving changes.
  - Replaced datetime reparsing and the one-second workaround with
    direct POSIXct arithmetic while preserving the published
    minute-level methodology.
  - Preserved compatibility behavior for missing ends, reversed
    intervals, and intervals lasting at least one week.
  - Added explicit input validation and corrected duplicate and
    uninitialized diagnostic-message handling.
  - Updated package metadata, documentation, maintainer contact details,
    and CI.