Add HourlyForecast struct and Hourly field to WeatherData for hourly temperature/condition data. Add Precipitation (int, -1 if unavailable) and IconHint (from aria-label/title/alt attributes) to both DayForecast and HourlyForecast. This enables downstream consumers like mort to replace inline DuckDuckGo scraping with a single GetWeather() call. Closes #51 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>