Replace selectable name sets with a country that owns names and climate presets.

Create picks a country; climate is rolled from the school seed and stored. Old Slavic saves lift as Russia.

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

tests/HSchool.People.Tests/ReviewFixTests.cs

@@ -69,7 +69,7 @@ public class ReviewFixTests
         for (var year = 0; year < 4; year++)
         {
             var before = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
-            roster = YearlyIntake.Apply(catalog, roster, Fixtures.SchoolSeed, "Slavic", date);
+            roster = YearlyIntake.Apply(catalog, roster, Fixtures.SchoolSeed, "Russia", date);
             date = date.AddYears(1);
 
             foreach (var person in roster.People)
@@ -98,7 +98,7 @@ public class ReviewFixTests
             catalog,
             roster,
             Fixtures.SchoolSeed,
-            "Slavic",
+            "Russia",
             new DateTime(2012, 9, 1, 0, 0, 0, DateTimeKind.Utc));
 
         // Every seat an intake fills is a first-year seat, so a brand-new family that took two or
@@ -153,7 +153,7 @@ public class ReviewFixTests
     public void AChildOfASingleMother_StillCarriesTheFathersSurnameAndPatronymic()
     {
         var catalog = Fixtures.Catalog();
-        var names = catalog.NameSets["Slavic"];
+        var names = catalog.Countries["Russia"].Names;
         var roster = Fixtures.Generate(Fixtures.Classrooms(11));
         var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
 
@@ -180,7 +180,7 @@ public class ReviewFixTests
     public void ASingleMotherFamily_CanStillTakeInAYoungerSibling()
     {
         var catalog = Fixtures.Catalog();
-        var names = catalog.NameSets["Slavic"];
+        var names = catalog.Countries["Russia"].Names;
         var roster = Fixtures.Generate(Fixtures.Classrooms(11));
         var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
         var motherOnly = roster.Families