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/ShaderBlock.cs

@@ -0,0 +1,114 @@
+namespace Ghost.DSL.ShaderCompiler.Parser;
+
+internal class ShaderBlock : IBlockParser<DSLShaderSyntax, DSLShaderSemantics>
+{
+    public static bool ShouldEnter(Token token)
+    {
+        return token.Match(TokenType.Keyword, TokenLexicon.KnownKeywords.SHADER);
+    }
+
+    public static DSLShaderSyntax Parse(TokenStreamSlice stream)
+    {
+        var shader = new DSLShaderSyntax();
+
+        stream.Expect(TokenType.Keyword);
+        shader.name = stream.Expect(TokenType.StringLiteral);
+        stream.Expect(TokenType.LBrace);
+
+        var bodyStream = stream.Slice(stream.Remaining - 1);
+        while (bodyStream.TryPeek(out var nextToken))
+        {
+            if (PropertiesBlock.ShouldEnter(nextToken))
+            {
+                shader.properties = PropertiesBlock.Parse(bodyStream.SliceNextBlock());
+            }
+            else if (PipelineBlock.ShouldEnter(nextToken))
+            {
+                shader.pipeline = PipelineBlock.Parse(bodyStream.SliceNextBlock());
+            }
+            else if (PassBlock.ShouldEnter(nextToken))
+            {
+                shader.passes ??= new();
+                shader.passes.Add(PassBlock.Parse(bodyStream.SliceNextBlock()));
+            }
+            else if (nextToken.Match(TokenType.Identifier))
+            {
+                var func = ParseUtility.ParseFunction(ref bodyStream, TokenType.StringLiteral | TokenType.Number | TokenType.Identifier);
+
+                shader.functionCalls ??= new();
+                shader.functionCalls.Add(func);
+            }
+            else
+            {
+                throw new Exception($"Unexpected token '{nextToken}' in shader body.");
+            }
+        }
+
+        stream.Expect(TokenType.RBrace);
+
+        return shader;
+    }
+
+    public static DSLShaderSemantics? SemanticAnalysis(DSLShaderSyntax? syntax, List<DSLShaderError> errors)
+    {
+        if (syntax == null)
+        {
+            return null;
+        }
+
+        var shaderModel = new DSLShaderSemantics
+        {
+            name = syntax.name.lexeme,
+            properties = PropertiesBlock.SemanticAnalysis(syntax.properties, errors),
+            pipeline = PipelineBlock.SemanticAnalysis(syntax.pipeline, errors)
+        };
+
+        if (syntax.passes != null)
+        {
+            foreach (var passSyntax in syntax.passes)
+            {
+                var passModel = PassBlock.SemanticAnalysis(passSyntax, errors);
+                if (passModel != null)
+                {
+                    shaderModel.passes ??= new();
+                    shaderModel.passes.Add(passModel);
+                }
+            }
+        }
+
+        if (syntax.functionCalls != null)
+        {
+            foreach (var func in syntax.functionCalls)
+            {
+                switch (func.name.lexeme)
+                {
+                    case TokenLexicon.KnownFunctions.FALLBACK:
+                        if (func.arguments == null || func.arguments.Count != 1)
+                        {
+                            errors.Add(new DSLShaderError
+                            {
+                                message = "Fallback declaration requires exactly one arguments: (fallback shader name).",
+                                line = func.name.line,
+                                column = func.name.column
+                            });
+
+                            continue;
+                        }
+
+                        shaderModel.fallback = func.arguments[0].lexeme;
+                        break;
+                    default:
+                        errors.Add(new DSLShaderError
+                        {
+                            message = $"Unknown function '{func.name.lexeme}' in shader.",
+                            line = func.name.line,
+                            column = func.name.column
+                        });
+                        break;
+                }
+            }
+        }
+
+        return shaderModel;
+    }
+}