Neither CurrentWeather nor geocodeOne checked resp.StatusCode, so a
non-200 forecast reply decoded into a zero-value struct reported as a
real 0-degree answer, and a non-200 geocode reply decoded into an empty
result list and was reported as ErrLocationUnknown — blaming the owner
for a service outage. Both now check http.StatusOK first, matching the
sibling kiwix and websearch clients, and return a wrapped error naming
the status instead.
Adds httptest coverage for a 500 from the forecast endpoint, a 500 from
the geocode endpoint, and a genuine empty geocode result, asserting each
takes a different path.
claude
e8ece874b1