Common-sense coverage pass on city_events.py: the list was 10/31 US and heavily
Anglosphere with no Latin America, no Middle East, and only London/Paris for all of
continental Europe. Add 9 verified events filling those gaps — Los Angeles (2025
wildfires), Moscow (2010 heat/wildfires), Madrid (2021 Storm Filomena), Athens (2018
Attica fires), Seoul (2022 floods), Dubai (2024 floods), Jeddah (2009 floods), Sao
Paulo (2014-17 drought), Rio de Janeiro (2010 floods). Every Wikipedia link
verified to resolve. 40 events total; nothing removed (no factual errors found).
Auto-sourcing a notable weather event from Wikipedia search proved unreliable
(wrong matches, low coverage), so city_events.py is a small, fact-checked list of
one iconic event per city (Katrina/New Orleans, Harvey/Houston, the 1952 Great
Smog/London, the 2021 heat dome/Seattle, ...) — 31 cities, each with a Wikipedia
link. The city page shows a 'Notable weather in {city}' callout when one exists and
otherwise just the flavor blurb. Tests check the curated slugs are all valid and the
callout renders (and is absent for uncurated cities).
