Add rain and snow minutes to the morning commute.

Day plans take a precomputed extra; Ai does not know precipitation.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.Simulation.Tests/WeatherTests.cs

@@ -63,6 +63,16 @@ public class WeatherTests
         }
     }
 
+    [Fact]
+    public void ExtraCommuteMinutes_FollowTheStreet()
+    {
+        var rules = Vanilla().BehaviorRules!;
+        Assert.Equal(6, new OutdoorWeather(-5f, Precipitation.Snow).ExtraCommuteMinutes(rules));
+        Assert.Equal(3, new OutdoorWeather(8f, Precipitation.Rain).ExtraCommuteMinutes(rules));
+        Assert.Equal(0, new OutdoorWeather(8f, Precipitation.None).ExtraCommuteMinutes(rules));
+        Assert.Equal(0, new OutdoorWeather(-5f, Precipitation.Snow).ExtraCommuteMinutes(null));
+    }
+
     [Fact]
     public void SkipEmpty_SetsMondayMorningWeather_NotSaturdays()
     {