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.Content/EventDefValidator.cs

@@ -17,6 +17,7 @@ internal static class EventDefValidator
         EventTriggers.DirectorSummon,
         EventTriggers.ParentMeeting,
         EventTriggers.DiseaseOutbreak,
+        EventTriggers.PoorGradeTrail,
     };
 
     private static readonly HashSet<string> Actions = new(StringComparer.Ordinal)

src/HSchool.Content/EventDefs.cs

@@ -15,6 +15,9 @@ public static class EventTriggers
     public const string DirectorSummon = "directorSummon";
     public const string ParentMeeting = "parentMeeting";
     public const string DiseaseOutbreak = "diseaseOutbreak";
+
+    /// <summary>Bad recent marks and/or truancy trail (slice 13 phase 76).</summary>
+    public const string PoorGradeTrail = "poorGradeTrail";
 }
 
 public static class EventActions

src/HSchool.Content/PeopleDefValidator.cs

@@ -752,6 +752,36 @@ internal static class PeopleDefValidator
                 $"BehaviorDef '{behavior.DefName}' lessonLateMinutes cannot be negative.");
         }
 
+        if (behavior.LessonDressMarkFactor is < 0f or > 1f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' lessonDressMarkFactor must be 0–1.");
+        }
+
+        if (behavior.PoorMarkTrailMaxAverage is < 0f or > 5f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' poorMarkTrailMaxAverage must be 0–5.");
+        }
+
+        if (behavior.PoorMarkTrailMinMarks < 0)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' poorMarkTrailMinMarks cannot be negative.");
+        }
+
+        if (behavior.TruancyTrailMinCount < 0)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' truancyTrailMinCount cannot be negative.");
+        }
+
+        if (behavior.GradeTrailSummonChance is < 0f or > 1f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' gradeTrailSummonChance must be 0–1.");
+        }
+
         if (behavior.DiseaseVectorScale < 0f)
         {
             throw new ContentLoadException(

src/HSchool.Content/PeopleDefs.cs

@@ -619,6 +619,7 @@ public sealed class BehaviorDef : Def
         "quarrel",
         "fight",
         "reprimand",
+        "truancy",
     ];
 
     /// <summary>
@@ -655,6 +656,33 @@ public sealed class BehaviorDef : Def
     /// </summary>
     public bool LessonMarkWhenLate { get; init; } = true;
 
+    /// <summary>
+    /// Multiplier on lesson quality when worn dress fails Appropriateness for this lesson.
+    /// 1 = log only (no mark hit). Vanilla is a light penalty.
+    /// </summary>
+    public float LessonDressMarkFactor { get; init; } = 0.95f;
+
+    /// <summary>
+    /// Mean of recent marks at or below this (and at least <see cref="PoorMarkTrailMinMarks"/>)
+    /// raises a poor-grade-trail notice. Zero disables the mark half of the trail.
+    /// </summary>
+    public float PoorMarkTrailMaxAverage { get; init; } = 2.5f;
+
+    /// <summary>How many recent marks are required before the average trail can fire. Zero disables.</summary>
+    public int PoorMarkTrailMinMarks { get; init; } = 3;
+
+    /// <summary>
+    /// Recent unexcused absences (truancy) at or above this raise the trail notice.
+    /// Zero disables the truancy half.
+    /// </summary>
+    public int TruancyTrailMinCount { get; init; } = 2;
+
+    /// <summary>
+    /// Chance to auto-enqueue a director summons when a poor trail first fires today.
+    /// Slice 12 must be able to start (principal + office); 0 skips the roll.
+    /// </summary>
+    public float GradeTrailSummonChance { get; init; } = 0.35f;
+
     /// <summary>
     /// Scales DiseaseDef weather/base onset chances. 0 disables natural onset; missing keeps 1.
     /// </summary>