Grow lesson skills only when the assigned teacher is standing in the room.

The timetable already named a teacher; learning ignored whether they were in the toilet, still walking, or not a person at all.

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

src/HSchool.Simulation/PersonLog.cs

@@ -14,6 +14,7 @@ public static class PersonLogTypes
     public const string ActionEnded = "action-ended";
     public const string ApparelReplaced = "apparel-replaced";
     public const string ApparelChanged = "apparel-changed";
+    public const string LessonNoTeacher = "lesson-no-teacher";
 }
 
 /// <summary>
@@ -58,6 +59,14 @@ public sealed record PersonLogEvent(string PersonId, DateTime Time, string Type,
             return string.Format(CultureInfo.InvariantCulture, catalog.Text(locale, key), name);
         }
 
+        if (Type.Equals(PersonLogTypes.LessonNoTeacher, StringComparison.Ordinal))
+        {
+            var name = catalog.Subjects.TryGetValue(ThingDef, out var subject)
+                ? catalog.Label(locale, subject)
+                : ThingDef;
+            return string.Format(CultureInfo.InvariantCulture, catalog.Text(locale, "LessonNoTeacher"), name);
+        }
+
         return Type;
     }
 }