Wire grade trail notices, dress mark factor, and truancy summons weights.

Lesson multipliers stay explicit in tests; poor marks and unexcused absences toast and may auto-summon, while illness stays excused.

src/HSchool.Simulation/GradeTrailSystem.cs

@@ -0,0 +1,78 @@
+using HSchool.Content;
+using HSchool.People;
+
+namespace HSchool.Simulation;
+
+/// <summary>
+/// After marks or absences: info toast, class-teacher log, and optional auto summons weight.
+/// Illness absences do not become summons offenses.
+/// </summary>
+internal static class GradeTrailSystem
+{
+    public static void AfterMark(School school, Person person)
+    {
+        if (school.Catalog?.BehaviorRules is not { } rules)
+        {
+            return;
+        }
+
+        TryReact(school, person, rules);
+    }
+
+    public static void AfterAbsent(School school, Person person, string? absenceReason)
+    {
+        if (school.Catalog?.BehaviorRules is not { } rules)
+        {
+            return;
+        }
+
+        if (GradeTrail.CountsAsSummonOffense(absenceReason)
+            && OffenseMemory.Record(person, OffenseKinds.Truancy, school.Clock.Time, otherPersonId: null, rules))
+        {
+            school.RosterTalkDirty = true;
+        }
+
+        TryReact(school, person, rules);
+    }
+
+    private static void TryReact(School school, Person person, BehaviorDef rules)
+    {
+        if (!GradeTrail.IsPoor(person, rules))
+        {
+            return;
+        }
+
+        if (!school.TryClaimGradeTrailNotice(person.Id, school.Clock.Time.Date))
+        {
+            return;
+        }
+
+        school.RaiseWorldEvent(new WorldEvent(EventTriggers.PoorGradeTrail, person.Id));
+
+        var schoolClass = ClassOf(school, person);
+        if (schoolClass?.ClassTeacherId is { } teacherId)
+        {
+            school.AppendDayLog(new PersonLogEvent(
+                person.Id,
+                school.Clock.Time,
+                PersonLogTypes.ClassTeacherGradeNote,
+                teacherId));
+        }
+
+        if (rules.GradeTrailSummonChance > 0f)
+        {
+            DirectorSummonSystem.TryEnqueue(school, person.Id, rules.GradeTrailSummonChance);
+        }
+    }
+
+    private static SchoolClass? ClassOf(School school, Person person)
+    {
+        if (person.ClassId is null || school.Roster is null)
+        {
+            return null;
+        }
+
+        return school.Roster.Classes.FirstOrDefault(row =>
+            row.Id.Equals(person.ClassId, StringComparison.Ordinal));
+    }
+}