Scale lesson skill gain by the teacher's subject skill.

Hiring a 78-math applicant already cost more than a 41; the class now actually learns faster when that teacher is in the room.

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

src/HSchool.Simulation/LessonLearningSystem.cs

@@ -14,7 +14,7 @@ namespace HSchool.Simulation;
 internal static class LessonLearningSystem
 {
     private static readonly QueryDescription Places =
-        new QueryDescription().WithAll<PersonIdentity, Presence>();
+        new QueryDescription().WithAll<PersonIdentity, Presence, PersonSkills>();
 
     private static readonly QueryDescription People =
         new QueryDescription().WithAll<PersonIdentity, PersonSkills, PersonTraits, PersonNeeds, PersonRoles, Presence, PersonActivity>();
@@ -43,11 +43,13 @@ internal static class LessonLearningSystem
         var catalog = school.Catalog;
         var world = school.World;
         var places = new Dictionary<string, Presence>(StringComparer.Ordinal);
+        var teacherSkills = new Dictionary<string, Dictionary<string, float>>(StringComparer.Ordinal);
         world.Query(
             in Places,
-            (ref PersonIdentity identity, ref Presence presence) =>
+            (ref PersonIdentity identity, ref Presence presence, ref PersonSkills personSkills) =>
             {
                 places[identity.Id] = presence;
+                teacherSkills[identity.Id] = personSkills.Values;
             });
 
         world.Query(
@@ -82,6 +84,10 @@ internal static class LessonLearningSystem
                 }
 
                 var hunger = needs.Values.GetValueOrDefault("Hunger", 1f);
+                IReadOnlyDictionary<string, float> taught = teacherSkills.TryGetValue(lesson.TeacherId, out var found)
+                    ? found
+                    : new Dictionary<string, float>(StringComparer.Ordinal);
+                var teacherSkill = LessonLearning.AverageTeacherSkill(subject, taught, catalog);
                 foreach (var share in subject.Skills)
                 {
                     if (!catalog.Skills.TryGetValue(share.Skill, out var skill) || skill.Abstract)
@@ -101,7 +107,8 @@ internal static class LessonLearningSystem
                         rules.LessonSkillPerHour,
                         hours,
                         hunger,
-                        TraitOffset(catalog, traits, share.Skill));
+                        TraitOffset(catalog, traits, share.Skill),
+                        teacherSkill);
                 }
             });
     }