Parse Circle Line times from TransXChange XML (output_txc_01CIR_.xml) with
separate weekday/Saturday/Sunday schedules, replacing the approximated
every-10-minutes pattern. Subtract 1 hour timezone offset (CET/CEST vs
GMT/BST) when computing Eurostar journey duration, shown for both viable
and unreachable services.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
