Refactor render graph error handling and resource APIs

- RenderGraph.Compile/Execute now return Error for better failure detection; error handling is propagated throughout compiler and executor.
- Renamed ScheduleReleaseResource to ReleaseResource for clarity; updated all usages.
- ResourceManager now calls ReleaseResource directly on Mesh, Material, and Shader types.
- Camera exposes Actual/Virtual size properties and Render returns Error.
- RenderingContext now uses IResourceManager for mesh/resource ops.
- Replaced custom BinaryWriter with BufferWriter in RenderGraphHasher.
- Improved variable naming, interface signatures, and code formatting.
- Added Error extension for IsSuccess/IsFailure.
- Minor FMOD/native interop and test code cleanups.
- No breaking API changes except for new Error return values on some methods.

src/Runtime/Ghost.Graphics/Core/Camera.cs

@@ -8,6 +8,7 @@ public class Camera
 {
     private readonly IRenderer _renderer;
 
+    // History buffers.
     private Handle<Texture> _colorTexture;
     private Handle<Texture> _depthTexture;
 
@@ -23,14 +24,17 @@ public class Camera
     /// Gets the actual width of the camera's render target in pixels. If upscaler is used, this is the width before upscaling.
     /// </summary>
     public uint ActualWidth => _actualWidth;
+
     /// <summary>
     /// Gets the actual height of the camera's render target in pixels. If upscaler is used, this is the height before upscaling.
     /// </summary>
     public uint ActualHeight => _actualHeight;
+
     /// <summary>
     /// Gets the virtual width of the camera's render target in pixels. If upscaler is used, this is the width after upscaling.
     /// </summary>
     public uint VirtualWidth => _virtualWidth;
+
     /// <summary>
     /// Gets the virtual height of the camera's render target in pixels. If upscaler is used, this is the height after upscaling.
     /// </summary>
@@ -64,8 +68,17 @@ public class Camera
         RenderGraph.Reset();
 
         var view = new ViewState(_virtualWidth, _virtualHeight, _actualWidth, _actualHeight);
-        RenderGraph.Compile(in view);
-        RenderGraph.Execute(context.CommandBuffer);
+        var e = RenderGraph.Compile(in view);
+        if (e != Error.None)
+        {
+            return e;
+        }
+
+        e = RenderGraph.Execute(context.CommandBuffer);
+        if (e != Error.None)
+        {
+            return e;
+        }
 
         return Error.None;
     }