Add class-teacher slots on SchoolClass with owner-only assign/clear.

EOF

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

src/HSchool.Server/Game/PersonCardReader.cs

@@ -43,12 +43,20 @@ internal static partial class PersonCardReader
 
         var catalog = school.Catalog;
         var classes = roster.Classes.ToDictionary(schoolClass => schoolClass.Id, StringComparer.Ordinal);
+        var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
         int? year = null;
         string? letter = null;
+        string? classTeacherId = null;
+        string? classTeacherName = null;
         if (person.ClassId is { } classId && classes.TryGetValue(classId, out var schoolClass))
         {
             year = schoolClass.Year;
             letter = schoolClass.Letter;
+            classTeacherId = schoolClass.ClassTeacherId;
+            if (classTeacherId is { } teacherId && people.TryGetValue(teacherId, out var teacher))
+            {
+                classTeacherName = teacher.Name.Full;
+            }
         }
 
         var needs = LiveNeeds(school.World, personId) ?? person.Needs;
@@ -98,7 +106,9 @@ internal static partial class PersonCardReader
             Connections: Connections(roster, person, catalog, locale),
             Orientation: OrientationOf(person, catalog, locale),
             TalkCircleMemberIds: circle?.MemberIds ?? [],
-            TalkTopicId: circle?.TopicId);
+            TalkTopicId: circle?.TopicId,
+            ClassTeacherId: classTeacherId,
+            ClassTeacherName: classTeacherName);
     }
 
     private static IReadOnlyDictionary<string, float>? LiveNeeds(World world, string personId)