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Climate (Core) layers a continuous seasonal-plus-daily temperature and the current season over the Calendar, registered via context.UseClimate. A new Lighting module (Graphics) adds DayNight: a daylight factor and ambient color from the calendar's time of day, pushed into the renderer's new AmbientLight (multiplied into world-space sprites only, so the scene darkens at night while screen-space overlays stay readable) and exposed as a sampleable SampleAt for the simulation. Both deterministic and GPU-free, covered by tests; docs updated. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>