diff --git a/server/NeonSprawl.Server.Tests/Game/Items/ItemDefinitionCatalogLoaderTests.cs b/server/NeonSprawl.Server.Tests/Game/Items/ItemDefinitionCatalogLoaderTests.cs
index 96c2137..3208b0e 100644
--- a/server/NeonSprawl.Server.Tests/Game/Items/ItemDefinitionCatalogLoaderTests.cs
+++ b/server/NeonSprawl.Server.Tests/Game/Items/ItemDefinitionCatalogLoaderTests.cs
@@ -129,7 +129,7 @@ public class ItemDefinitionCatalogLoaderTests
     {
         // Arrange
         var (_, itemsDir, schemaPath) = CreateTempContentLayout();
-        var bad = """
+        const string bad = """
                   {
                     "schemaVersion": 1,
                     "items": [
diff --git a/server/NeonSprawl.Server.Tests/InMemoryWebApplicationFactory.cs b/server/NeonSprawl.Server.Tests/InMemoryWebApplicationFactory.cs
index d7ad919..bf7f11f 100644
--- a/server/NeonSprawl.Server.Tests/InMemoryWebApplicationFactory.cs
+++ b/server/NeonSprawl.Server.Tests/InMemoryWebApplicationFactory.cs
@@ -5,8 +5,8 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Time.Testing;
 using NeonSprawl.Server.Game.AbilityInput;
-using NeonSprawl.Server.Game.PositionState;
 using NeonSprawl.Server.Game.Items;
+using NeonSprawl.Server.Game.PositionState;
 using NeonSprawl.Server.Game.Mastery;
 using NeonSprawl.Server.Game.Skills;
 using Npgsql;
diff --git a/server/NeonSprawl.Server/Game/Items/ItemDefinitionCatalog.cs b/server/NeonSprawl.Server/Game/Items/ItemDefinitionCatalog.cs
index 12ac71d..1ee21ea 100644
--- a/server/NeonSprawl.Server/Game/Items/ItemDefinitionCatalog.cs
+++ b/server/NeonSprawl.Server/Game/Items/ItemDefinitionCatalog.cs
@@ -3,27 +3,21 @@ using System.Collections.ObjectModel;
 namespace NeonSprawl.Server.Game.Items;
 
 /// <summary>In-memory item catalog loaded at startup (NEO-51). Game code should prefer injectable item registry for lookups (NEO-52).</summary>
-public sealed class ItemDefinitionCatalog
+public sealed class ItemDefinitionCatalog(
+    string itemsDirectory,
+    IReadOnlyDictionary<string, ItemDefRow> byId,
+    int catalogJsonFileCount)
 {
-    public ItemDefinitionCatalog(
-        string itemsDirectory,
-        IReadOnlyDictionary<string, ItemDefRow> byId,
-        int catalogJsonFileCount)
-    {
-        ItemsDirectory = itemsDirectory;
-        ById = new ReadOnlyDictionary<string, ItemDefRow>(new Dictionary<string, ItemDefRow>(byId, StringComparer.Ordinal));
-        CatalogJsonFileCount = catalogJsonFileCount;
-    }
 
     /// <summary>Absolute path to the directory that was enumerated for <c>*_items.json</c> catalogs.</summary>
-    public string ItemsDirectory { get; }
+    public string ItemsDirectory { get; } = itemsDirectory;
 
-    public IReadOnlyDictionary<string, ItemDefRow> ById { get; }
+    public IReadOnlyDictionary<string, ItemDefRow> ById { get; } = new ReadOnlyDictionary<string, ItemDefRow>(new Dictionary<string, ItemDefRow>(byId, StringComparer.Ordinal));
 
     public int DistinctItemCount => ById.Count;
 
     /// <summary>Number of <c>*_items.json</c> files under <see cref="ItemsDirectory"/>.</summary>
-    public int CatalogJsonFileCount { get; }
+    public int CatalogJsonFileCount { get; } = catalogJsonFileCount;
 
     /// <summary>Resolves a catalog row by stable <paramref name="id"/>.</summary>
     public bool TryGetItem(string id, out ItemDefRow? row) =>