Refactor error handling: use Error enum, update APIs

Replaces ErrorStatus with Error across all systems for consistency.
Renames ResourceBarrierData fields to camelCase.
Adds BindlessAccess enum and updates GetBindlessIndex API.
Updates method signatures, result types, and error checks.
Modernizes HLSL mesh shader syntax and fixes naming.
Improves code style and updates comments for clarity.

Ghost.Core/Result.cs

@@ -28,7 +28,7 @@ public readonly struct Result
         return new Result(false, message);
     }
 
-    public static Result Failure(ErrorStatus status)
+    public static Result Failure(Error status)
     {
         return new Result(false, status.ToString());
     }
@@ -43,7 +43,7 @@ public readonly struct Result
         return Result<T>.Failure(message);
     }
 
-    public static Result<T> Failure<T>(ErrorStatus status)
+    public static Result<T> Failure<T>(Error status)
     {
         return Result<T>.Failure(status.ToString());
     }
@@ -117,7 +117,7 @@ public readonly struct Result<T>
     public static implicit operator bool(Result<T> result) => result.IsSuccess;
 }
 
-public enum ErrorStatus : byte
+public enum Error : byte
 {
     None,
     NotFound,
@@ -249,9 +249,9 @@ public readonly ref struct RefResult<T, E>
 
 public static class ResultExtensions
 {
-    public static void ThrowIfFailed(this ErrorStatus result, [CallerArgumentExpression(nameof(result))] string? op = null)
+    public static void ThrowIfFailed(this Error result, [CallerArgumentExpression(nameof(result))] string? op = null)
     {
-        if (result != ErrorStatus.None)
+        if (result != Error.None)
         {
             throw new InvalidOperationException($"{op} failed: {result}");
         }