refactor: standardize MethodImplOptions with named constants (#566)

Replace magic numbers with self-documenting named constants:
- (MethodImplOptions)768 → OptimizeAndInline
- (MethodImplOptions)512 → Optimize
- MethodImplOptions.AggressiveInlining → Inline

Add MethodImplOptionsConstants class with:
- OptimizeAndInline: AggressiveInlining | AggressiveOptimization (768)
- Optimize: AggressiveOptimization (512)
- Inline: AggressiveInlining (256)

Exposed via global using static for direct access without prefix.

Files changed: 128
Replacements: ~2579 occurrences

Author: Nucs

src/NumSharp.Core/Backends/Default/ArrayManipulation/Default.Transpose.cs

@@ -9,13 +9,13 @@ namespace NumSharp.Backends
 {
     public partial class DefaultEngine
     {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        [MethodImpl(Inline)]
         public static int check_and_adjust_axis(NDArray nd, int axis)
         {
             return check_and_adjust_axis(nd.ndim, axis);
         }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        [MethodImpl(Inline)]
         public static int check_and_adjust_axis(int ndims, int axis)
         {
             int adjusted = axis >= 0 ? axis : ndims + axis;

src/NumSharp.Core/Backends/Default/Helpers/DefaultEngine.ResolveUnaryReturnType.cs

@@ -5,10 +5,10 @@ namespace NumSharp.Backends
 {
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         public NPTypeCode ResolveUnaryReturnType(in NDArray nd, Type @override) => ResolveUnaryReturnType(nd, @override?.GetTypeCode());
 
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         public NPTypeCode ResolveUnaryReturnType(in NDArray nd, NPTypeCode? @override)
         {
             if (!@override.HasValue)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Boolean.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddBoolean(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Byte.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddByte(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Char.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddChar(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Decimal.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddDecimal(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Double.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddDouble(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Int16.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddInt16(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Int32.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddInt32(in NDArray lhs, in NDArray rhs)

src/NumSharp.Core/Backends/Default/Math/Add/Default.Add.Int64.cs

@@ -20,7 +20,7 @@ namespace NumSharp.Backends
     //v2
     public partial class DefaultEngine
     {
-        [MethodImpl((MethodImplOptions)768)]
+        [MethodImpl(OptimizeAndInline)]
         [SuppressMessage("ReSharper", "JoinDeclarationAndInitializer")]
         [SuppressMessage("ReSharper", "CompareOfFloatsByEqualityOperator")]
         public unsafe NDArray AddInt64(in NDArray lhs, in NDArray rhs)