docs: settle weather source on OpenWeatherMap

A polybar backup script for OWM turned up, which beats the weather.com
scraper: it has a working condition mapping. Port the domain knowledge,
not the code.

Worth keeping: the OWM condition-id ranges, day/night selection against
sys.sunrise/sys.sunset, and the Beaufort wind thresholds. Becomes a
table in data.lua.

Not portable: polybar %{F}/%{T} format tokens, hardcoded hex (UDT roles
replace them), bc conversions (Lua arithmetic), one-line output (a
card). So the script shrinks to curl-and-cache and Lua does the rest.

The reference script hardcodes a live API key plus city and country. The
key and location move to ~/.config/udt/weather.env, outside the repo,
same reasoning as roles.conf. Nothing carries a key in-repo, and
weather.env is gitignored so a stray copy cannot be staged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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