Let the catalog describe clothes and carryables on ThingDef without dressing anyone.

Empty layers keep furniture on the map; a known layer set and ColorDef palette reject unknown ids at load.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/HSchool.Content/PackPaths.cs

@@ -123,6 +123,9 @@ internal static class PackPaths
             case "behavior":
                 kind = DefKind.Behavior;
                 return true;
+            case "colors":
+                kind = DefKind.Color;
+                return true;
             default:
                 kind = default;
                 return false;