Implement phase 4 critical table imports

src/RolemasterDb.ImportTool/CriticalImportCommandRunner.cs

@@ -8,6 +8,8 @@ public sealed class CriticalImportCommandRunner
     private readonly ImportArtifactWriter artifactWriter = new();
     private readonly PdfXmlExtractor pdfXmlExtractor = new();
     private readonly StandardCriticalTableParser standardParser = new();
+    private readonly VariantColumnCriticalTableParser variantColumnParser = new();
+    private readonly GroupedVariantCriticalTableParser groupedVariantParser = new();
 
     public async Task<int> RunAsync(ResetOptions options)
     {
@@ -96,14 +98,24 @@ public sealed class CriticalImportCommandRunner
             ?? throw new InvalidOperationException($"No enabled manifest entry was found for '{tableSlug}'.");
     }
 
-    private StandardCriticalTableParseResult Parse(CriticalImportManifestEntry entry, string xmlContent)
+    private CriticalTableParseResult Parse(CriticalImportManifestEntry entry, string xmlContent)
     {
-        if (!string.Equals(entry.Family, "standard", StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(entry.Family, "standard", StringComparison.OrdinalIgnoreCase))
         {
-            throw new InvalidOperationException($"Family '{entry.Family}' is not supported by phase 2.");
+            return standardParser.Parse(entry, xmlContent);
         }
 
-        return standardParser.Parse(entry, xmlContent);
+        if (string.Equals(entry.Family, "variant_column", StringComparison.OrdinalIgnoreCase))
+        {
+            return variantColumnParser.Parse(entry, xmlContent);
+        }
+
+        if (string.Equals(entry.Family, "grouped_variant", StringComparison.OrdinalIgnoreCase))
+        {
+            return groupedVariantParser.Parse(entry, xmlContent);
+        }
+
+        throw new InvalidOperationException($"Family '{entry.Family}' is not supported by the importer.");
     }
 
     private static ImportArtifactPaths CreateArtifactPaths(string slug) =>