Dress people at generation from a separate apparel stream.

Wardrobes live on the person in people.json: everyday layers, textbooks per parallel, and chance-based bags from catalog data. Hauling and the carry cap are defs, not constants. The golden roster gains an items column; later family members shift because Hauling consumes extra appearance rolls. Old saves without items are dressed on load.

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

src/HSchool.Content/PeopleDefValidator.cs

@@ -513,6 +513,19 @@ internal static class PeopleDefValidator
             throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' goal weights cannot be negative.");
         }
 
+        if (behavior.CarryMassBase < 0f
+            || behavior.CarryMassPerStrength < 0f
+            || behavior.CarryMassPerEndurance < 0f
+            || behavior.CarryMassPerHauling < 0f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' carry mass cannot be negative.");
+        }
+
+        if (behavior.OptionalApparelChance is < 0f or > 1f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' optionalApparelChance must be 0–1.");
+        }
+
         // A pack may invert this on purpose — lunch then pulls the class out of the lesson.
         // The warning is the catch; refusing to load would make the number unmoddable.
         if (behavior.LunchWeight > behavior.DutyLessonWeight)