refactor: Remove pragma warning for floating point equality in TBar struct; update .editorconfig to suppress SonarQube S1244

.editorconfig

@@ -14,6 +14,10 @@ insert_final_newline = true
 # High-performance SIMD code intentionally has complex control flow
 dotnet_diagnostic.S3776.severity = none
 
+# Suppress SonarQube S1244 - Floating point equality
+# Intentional for exact struct comparison and zero checks in high-performance code
+dotnet_diagnostic.S1244.severity = none
+
 #### C# Coding Conventions ####
 
 # "var" preferences

lib/core/tbar/tbar.cs

@@ -67,7 +67,6 @@ public readonly struct TBar : IEquatable<TBar>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public override string ToString() => $"[{AsDateTime:yyyy-MM-dd HH:mm:ss}: O={Open:F2}, H={High:F2}, L={Low:F2}, C={Close:F2}, V={Volume:F2}]";
 
-#pragma warning disable S1244 // Floating point equality is intentional for exact struct comparison
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(TBar other) =>
         Time == other.Time &&
@@ -81,5 +80,4 @@ public readonly struct TBar : IEquatable<TBar>
     public override int GetHashCode() => HashCode.Combine(Time, Open, High, Low, Close, Volume);
     public static bool operator ==(TBar left, TBar right) => left.Equals(right);
     public static bool operator !=(TBar left, TBar right) => !left.Equals(right);
-#pragma warning restore S1244
 }