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

EOF

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

src/HSchool.Server/Game/GameLoopService.cs

@@ -286,6 +286,23 @@ internal sealed class GameLoopService(
                     unassign.Result);
                 break;
 
+            case GameCommand.AssignClassTeacher assignClassTeacher:
+                HandleClassTeacher(
+                    assignClassTeacher.SchoolId,
+                    new WorkerCommand.AssignClassTeacher(
+                        assignClassTeacher.ClassId,
+                        assignClassTeacher.PersonId,
+                        assignClassTeacher.Result),
+                    assignClassTeacher.Result);
+                break;
+
+            case GameCommand.ClearClassTeacher clearClassTeacher:
+                HandleClassTeacher(
+                    clearClassTeacher.SchoolId,
+                    new WorkerCommand.ClearClassTeacher(clearClassTeacher.ClassId, clearClassTeacher.Result),
+                    clearClassTeacher.Result);
+                break;
+
             case GameCommand.PinLesson pin:
                 HandleTimetable(
                     pin.SchoolId,
@@ -385,6 +402,14 @@ internal sealed class GameLoopService(
         }
     }
 
+    private void HandleClassTeacher(int schoolId, WorkerCommand command, TaskCompletionSource<ClassTeacherOutcome> result)
+    {
+        if (!_workers.TryGetValue(schoolId, out var worker) || !worker.Post(command))
+        {
+            result.TrySetResult(ClassTeachers.UnknownSchool());
+        }
+    }
+
     private void HandleTimetable(int schoolId, WorkerCommand command, TaskCompletionSource<TimetableOutcome> result)
     {
         if (!_workers.TryGetValue(schoolId, out var worker) || !worker.Post(command))