Scale lesson gain by warmth the same way hunger already did.

The bar was live and drove dressing; a frozen pupil in class still learned as if it were May.

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

src/HSchool.Simulation/LessonLearningSystem.cs

@@ -84,6 +84,12 @@ internal static class LessonLearningSystem
                 }
 
                 var hunger = needs.Values.GetValueOrDefault("Hunger", 1f);
+                var warmth = needs.Values.GetValueOrDefault("Warmth", 1f);
+                if (warmth < rules.NeedThreshold)
+                {
+                    school.TryLogLessonOnce(personId, PersonLogTypes.LessonCold, lesson.Subject);
+                }
+
                 IReadOnlyDictionary<string, float> taught = teacherSkills.TryGetValue(lesson.TeacherId, out var found)
                     ? found
                     : new Dictionary<string, float>(StringComparer.Ordinal);
@@ -108,7 +114,8 @@ internal static class LessonLearningSystem
                         hours,
                         hunger,
                         TraitOffset(catalog, traits, share.Skill),
-                        teacherSkill);
+                        teacherSkill,
+                        warmth);
                 }
             });
     }