Show director summons as info toasts and presence queue labels.

Corridor waiters need a summon-phase byte on presence (v11); EventDef DirectorSummoned is info-only so clocks keep running.

src/HSchool.Content/EventDefValidator.cs

@@ -14,6 +14,7 @@ internal static class EventDefValidator
         EventTriggers.DayStart,
         EventTriggers.LessonStart,
         EventTriggers.GenerationFailed,
+        EventTriggers.DirectorSummon,
     };
 
     private static readonly HashSet<string> Actions = new(StringComparer.Ordinal)

src/HSchool.Content/EventDefs.cs

@@ -12,6 +12,7 @@ public static class EventTriggers
     public const string DayStart = "dayStart";
     public const string LessonStart = "lessonStart";
     public const string GenerationFailed = "generationFailed";
+    public const string DirectorSummon = "directorSummon";
 }
 
 public static class EventActions