Refactor: variant-aware shader/material pipeline overhaul

Major architectural update to graphics/material/shader system:
- Introduced strongly-typed key structs (Key64/Key128) for passes, variants, and pipelines; removed legacy key types.
- Implemented robust hashing and key generation utilities for efficient variant and pipeline lookup/caching.
- Shader compiler now compiles/caches all keyword variants using new key system; includes handled as lists.
- Switched to push constant root signature for per-draw data; updated HLSL and C# codegen accordingly.
- Refactored Material, Shader, and Pass data structures for cache efficiency and variant support.
- Pipeline library and PSO management now use 128-bit keys and variant-specific caching.
- Replaced WorldNode with SceneNode in editor/scene graph; introduced ComponentManager for archetype/query management.
- Migrated math utilities to Misaki.HighPerformance.Mathematics; updated editor controls.
- Updated all HLSL and codegen for new buffer/push constant layouts and macros.
- Misc: project reference cleanup, D3D12 Work Graph support, doc updates, and code modernization.

Ghost.DSL/ShaderCompiler/Parser/DefinesBlock.cs

@@ -0,0 +1,45 @@
+namespace Ghost.DSL.ShaderCompiler.Parser;
+
+internal class DefinesBlock : IBlockParser<List<Token>, List<string>>
+{
+    public static bool ShouldEnter(Token token)
+    {
+        return token.Match(TokenType.Keyword, TokenLexicon.KnownKeywords.DEFINES);
+    }
+
+    public static List<Token> Parse(TokenStreamSlice stream)
+    {
+        stream.Expect(TokenType.Keyword);
+        stream.Expect(TokenType.LBrace);
+
+        var defines = new List<Token>();
+
+        var bodyStream = stream.Slice(stream.Remaining - 1);
+        while (bodyStream.HasMore)
+        {
+            var defineToken = bodyStream.Expect(TokenType.Identifier);
+            defines.Add(defineToken);
+            bodyStream.Expect(TokenType.Semicolon);
+        }
+
+        stream.Expect(TokenType.RBrace);
+
+        return defines;
+    }
+
+    public static List<string>? SemanticAnalysis(List<Token>? syntax, List<DSLShaderError> errors)
+    {
+        if (syntax == null)
+        {
+            return null;
+        }
+
+        var defines = new List<string>(syntax.Count);
+        foreach (var defineToken in syntax)
+        {
+            defines.Add(defineToken.lexeme);
+        }
+
+        return defines;
+    }
+}