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

src/HSchool.Content/PeopleDefs.cs

@@ -285,6 +285,15 @@ public sealed class BehaviorDef : Def
 
     public int CommuteSlackMax { get; init; }
 
+    /// <summary>
+    /// Extra minutes on a rainy morning. Added to slack when the street is wet. A pack without
+    /// the field adds nothing so the catalog still loads.
+    /// </summary>
+    public int CommuteRainMinutes { get; init; }
+
+    /// <summary>Same as <see cref="CommuteRainMinutes"/> when the street is snow.</summary>
+    public int CommuteSnowMinutes { get; init; }
+
     /// <summary>A new goal must beat the current one by this much before the person switches.</summary>
     public float SwitchMargin { get; init; }