add shel

src/HSchool.Content/CatalogLoader.cs

@@ -307,6 +307,7 @@ public sealed class CatalogLoader
         var bodyAttributes = new Dictionary<string, BodyAttributeDef>(StringComparer.Ordinal);
         var needs = new Dictionary<string, NeedDef>(StringComparer.Ordinal);
         var nameSets = new Dictionary<string, NameSetDef>(StringComparer.Ordinal);
+        var subjects = new Dictionary<string, SubjectDef>(StringComparer.Ordinal);
 
         foreach (var (key, json) in resolved)
         {
@@ -351,6 +352,9 @@ public sealed class CatalogLoader
                 case DefKind.NameSet:
                     nameSets[key.Name] = Jsonc.Deserialize<NameSetDef>(json);
                     break;
+                case DefKind.Subject:
+                    subjects[key.Name] = Jsonc.Deserialize<SubjectDef>(json);
+                    break;
             }
         }
 
@@ -369,6 +373,7 @@ public sealed class CatalogLoader
             bodyAttributes,
             needs,
             nameSets,
+            subjects,
             ru,
             en);
     }
@@ -421,6 +426,33 @@ public sealed class CatalogLoader
                     throw new ContentLoadException($"RoomDef '{room.DefName}' references unknown WorkDef '{work}'.");
                 }
             }
+
+            if (room.Homeroom)
+            {
+                if (room.Slots.Count > 0)
+                {
+                    throw new ContentLoadException($"RoomDef '{room.DefName}' is a homeroom and cannot declare named slots.");
+                }
+
+                if (string.IsNullOrWhiteSpace(room.SeatThing) || !catalog.Things.TryGetValue(room.SeatThing, out var seat) || seat.Abstract)
+                {
+                    throw new ContentLoadException($"RoomDef '{room.DefName}' seatThing is missing or unknown.");
+                }
+
+                if (seat.PupilSlots <= 0)
+                {
+                    throw new ContentLoadException($"RoomDef '{room.DefName}' seatThing '{room.SeatThing}' must have pupilSlots.");
+                }
+
+                if (room.DefaultSeats < 1 || room.DefaultSeats > byte.MaxValue)
+                {
+                    throw new ContentLoadException($"RoomDef '{room.DefName}' defaultSeats must be 1–{byte.MaxValue}.");
+                }
+            }
+            else if (!string.IsNullOrWhiteSpace(room.SeatThing) || room.DefaultSeats != 0)
+            {
+                throw new ContentLoadException($"RoomDef '{room.DefName}' is not a homeroom and cannot set seatThing or defaultSeats.");
+            }
         }
 
         PeopleDefValidator.Validate(catalog);