refactor: organize updaters into Interfaces/Factories/Strategies

Pure file move + namespace alignment, no logic changes:
- Interfaces/  IItemUpdater, IItemUpdaterFactory (GildedRoseKata.Interfaces)
- Factories/   ItemUpdaterFactory incl. static Default() (GildedRoseKata.Factories)
- Strategies/  ItemUpdaterBase + the 5 concrete updaters (GildedRoseKata.Strategies)

GildedRose.cs changes only in usings; Item.cs and Program.cs untouched.
Full suite 24/24 green; approval snapshot byte-identical.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

csharp.xUnit/GildedRose/Factories/ItemUpdaterFactory.cs

@@ -1,7 +1,10 @@
 using System;
 using System.Collections.Generic;
 
-namespace GildedRoseKata;
+using GildedRoseKata.Interfaces;
+using GildedRoseKata.Strategies;
+
+namespace GildedRoseKata.Factories;
 
 public class ItemUpdaterFactory : IItemUpdaterFactory
 {

csharp.xUnit/GildedRose/GildedRose.cs

@@ -1,5 +1,8 @@
 using System.Collections.Generic;
 
+using GildedRoseKata.Factories;
+using GildedRoseKata.Interfaces;
+
 namespace GildedRoseKata;
 
 public class GildedRose

csharp.xUnit/GildedRose/Interfaces/IItemUpdater.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Interfaces;
 
 public interface IItemUpdater
 {

csharp.xUnit/GildedRose/Interfaces/IItemUpdaterFactory.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Interfaces;
 
 public interface IItemUpdaterFactory
 {

csharp.xUnit/GildedRose/Strategies/AgedBrieUpdater.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Strategies;
 
 public class AgedBrieUpdater : ItemUpdaterBase
 {

csharp.xUnit/GildedRose/Strategies/BackstagePassUpdater.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Strategies;
 
 public class BackstagePassUpdater : ItemUpdaterBase
 {

csharp.xUnit/GildedRose/Strategies/ConjuredItemUpdater.cs

@@ -1,4 +1,6 @@
-namespace GildedRoseKata;
+using GildedRoseKata.Factories;
+
+namespace GildedRoseKata.Strategies;
 
 public class ConjuredItemUpdater : ItemUpdaterBase
 {

csharp.xUnit/GildedRose/Strategies/ItemUpdaterBase.cs

@@ -1,6 +1,8 @@
 using System;
 
-namespace GildedRoseKata;
+using GildedRoseKata.Interfaces;
+
+namespace GildedRoseKata.Strategies;
 
 public abstract class ItemUpdaterBase : IItemUpdater
 {

csharp.xUnit/GildedRose/Strategies/NormalItemUpdater.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Strategies;
 
 public class NormalItemUpdater : ItemUpdaterBase
 {

csharp.xUnit/GildedRose/Strategies/SulfurasUpdater.cs

@@ -1,4 +1,4 @@
-namespace GildedRoseKata;
+namespace GildedRoseKata.Strategies;
 
 public class SulfurasUpdater : ItemUpdaterBase
 {