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.Graphics/RHI/ICommandBuffer.cs

@@ -104,7 +104,7 @@ public interface ICommandBuffer : IDisposable
     /// Sets the pipeline state object
     /// </summary>
     /// <param name="pipelineKey">Pipeline state to set</param>
-    void SetPipelineState(GraphicsPipelineKey pipelineKey);
+    void SetPipelineState(Key128<GraphicsPipeline> pipelineKey);
 
     /// <summary>
     /// Sets the constant buffer view for the specified slot in the graphics pipeline.
@@ -135,6 +135,14 @@ public interface ICommandBuffer : IDisposable
     /// <param name="topology">The primitive topology that determines how the input vertices are interpreted during rendering.</param>
     void SetPrimitiveTopology(PrimitiveTopology topology);
 
+    /// <summary>
+    /// Sets a 32-bit constant value in the graphics root signature at the specified index.
+    /// </summary>
+    /// <param name="rootIndex">The zero-based index of the root parameter in the graphics root signature to set the constant for.</param>
+    /// <param name="constantBuffer">A read-only span containing the 32-bit constant values to set.</param>
+    /// <param name="offsetIn32Bits">The offset, in 32-bit values, from the start of the root parameter where the constants will be set.</param>
+    void SetGraphicsRoot32Constants(uint rootIndex, ReadOnlySpan<uint> constantBuffer, uint offsetIn32Bits = 0);
+
     /// <summary>
     /// Issues a non-indexed draw call.
     /// </summary>