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>

src/HSchool.Content/PeopleDefValidator.cs

@@ -522,6 +522,12 @@ internal static class PeopleDefValidator
                 $"BehaviorDef '{behavior.DefName}' commute slack must be a non-negative range with min ≤ max.");
         }
 
+        if (behavior.CommuteRainMinutes < 0 || behavior.CommuteSnowMinutes < 0)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' commute rain and snow minutes cannot be negative.");
+        }
+
         if (behavior.DutyLessonWeight < 0f
             || behavior.DutyTravelWeight < 0f
             || behavior.NeedWeightAtZero < 0f