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.Core/Handle.cs

@@ -23,12 +23,12 @@ public readonly struct Handle<T> : IEquatable<Handle<T>>
     public readonly bool IsValid => this != Invalid;
     public readonly bool IsInvalid => this == Invalid;
 
-    public readonly override int GetHashCode()
+    public override readonly int GetHashCode()
     {
         return ID + (Generation << 16);
     }
 
-    public readonly override bool Equals(object? obj)
+    public override readonly bool Equals(object? obj)
     {
         return obj is Handle<T> id && Equals(id);
     }
@@ -76,12 +76,12 @@ public readonly struct Identifier<T> : IEquatable<Identifier<T>>
     public readonly bool IsValid => this != Invalid;
     public readonly bool IsInvalid => this == Invalid;
 
-    public readonly override int GetHashCode()
+    public override readonly int GetHashCode()
     {
         return Value;
     }
 
-    public readonly override bool Equals(object? obj)
+    public override readonly bool Equals(object? obj)
     {
         return obj is Identifier<T> id && Equals(id);
     }
@@ -152,7 +152,7 @@ public readonly struct Key64<T> : IEquatable<Key64<T>>
     public bool IsValid => this != Invalid;
     public bool IsInvalid => this == Invalid;
 
-    public readonly override int GetHashCode()
+    public override readonly int GetHashCode()
     {
         return Value.GetHashCode();
     }
@@ -167,7 +167,7 @@ public readonly struct Key64<T> : IEquatable<Key64<T>>
         return Value.CompareTo(other.Value);
     }
 
-    public readonly override bool Equals(object? obj)
+    public override readonly bool Equals(object? obj)
     {
         return obj is Key64<T> id && Equals(id);
     }
@@ -205,7 +205,7 @@ public readonly struct Key128<T> : IEquatable<Key128<T>>
     public bool IsValid => this != Invalid;
     public bool IsInvalid => this == Invalid;
 
-    public readonly override int GetHashCode()
+    public override readonly int GetHashCode()
     {
         return Value.GetHashCode();
     }
@@ -220,7 +220,7 @@ public readonly struct Key128<T> : IEquatable<Key128<T>>
         return Value.CompareTo(other.Value);
     }
 
-    public readonly override bool Equals(object? obj)
+    public override readonly bool Equals(object? obj)
     {
         return obj is Key128<T> id && Equals(id);
     }