Phase 33: technician climate control and locker assignment.

src/HSchool.People/Roster.cs

@@ -49,6 +49,9 @@ public sealed record Person
     /// <summary>Worn, bag, locker and home. Empty on rosters written before clothes existed.</summary>
     public IReadOnlyList<InventoryItem> Items { get; init; } = [];
 
+    /// <summary>Changing-room node when this pupil won a locker slot. Null for staff and the rest.</summary>
+    public string? LockerRoomId { get; init; }
+
     public int AgeOn(DateTime asOf) => SchoolYears.AgeYears(BirthDate, asOf);
 }