Revert "feat(sky): the night sky wheels with the Dereth clock; uniform time fade with a scoped twilight band"

This reverts commit 0dac024cdb.

src/AcDream.App/Composition/FrameRootComposition.cs

@@ -333,18 +333,6 @@ internal sealed class FrameRootCompositionPhase
                 skyForNightSky.EnhancedNightSkyActive = () =>
                     nightSkyController.ActiveRuntime?.Descriptor.Id
                         == AcDream.App.Rendering.Packs.BuiltInAtmosphericRenderPack.Id;
-                // The starfield wheels with the Dereth clock: one turn per
-                // day about the celestial pole plus ~1 degree/night of
-                // seasonal drift (dayOfYear/360) — sky.frag's rotation block.
-                var nightSkyTime = d.WorldTime;
-                skyForNightSky.NightSkyRotationTurns = () =>
-                {
-                    var cal = nightSkyTime.CurrentCalendar;
-                    int dayOfYear = (int)cal.Month
-                        * AcDream.Core.World.DerethDateTime.DaysInAMonth
-                        + (cal.Day - 1);
-                    return (float)(nightSkyTime.DayFraction + dayOfYear / 360.0);
-                };
             }
         }