Initial commit: LegacyForge mod loader for Minecraft Legacy Edition

SKSE-style external mod loader with zero game source modifications.
- LegacyForge.Launcher: C# console app that injects runtime DLL into game process
- LegacyForgeRuntime: C++ DLL with PDB symbol resolution, MinHook function hooking, and .NET CoreCLR hosting
- LegacyForge.Core: C# mod discovery and lifecycle management
- LegacyForge.API: Fabric-style mod API with namespaced string IDs, fluent property builders, and event system
- ExampleMod: Sample mod demonstrating block/item registration

LegacyForge.API/Recipe/RecipeRegistry.cs

@@ -0,0 +1,40 @@
+namespace LegacyForge.API.Recipe;
+
+/// <summary>
+/// Recipe registration via the LegacyForge registry.
+/// Accessed through <see cref="Registry.Recipe"/>.
+/// </summary>
+public static class RecipeRegistry
+{
+    /// <summary>
+    /// Add a shaped crafting recipe.
+    /// </summary>
+    /// <param name="result">The output item identifier.</param>
+    /// <param name="resultCount">Number of items produced.</param>
+    /// <param name="pattern">Crafting grid pattern rows (e.g. "XXX", " | ", " | " for a pickaxe).</param>
+    /// <param name="keys">Character-to-ingredient mappings.</param>
+    public static void AddShaped(Identifier result, int resultCount, string[] pattern,
+                                  params (char key, Identifier ingredient)[] keys)
+    {
+        string patternStr = string.Join(";", pattern);
+        string ingredientStr = string.Join(";",
+            keys.Select(k => $"{k.key}={k.ingredient}"));
+
+        NativeInterop.native_add_shaped_recipe(
+            result.ToString(), resultCount, patternStr, ingredientStr);
+
+        Logger.Debug($"Added shaped recipe -> {resultCount}x {result}");
+    }
+
+    /// <summary>
+    /// Add a furnace/smelting recipe.
+    /// </summary>
+    /// <param name="input">The input item/block identifier.</param>
+    /// <param name="output">The output item identifier.</param>
+    /// <param name="xp">Experience granted per smelt.</param>
+    public static void AddFurnace(Identifier input, Identifier output, float xp)
+    {
+        NativeInterop.native_add_furnace_recipe(input.ToString(), output.ToString(), xp);
+        Logger.Debug($"Added furnace recipe: {input} -> {output} ({xp} xp)");
+    }
+}