refactor: optimize event args handling for performance improvements

lib/core/tbarseries/tbarseries.cs

@@ -6,9 +6,8 @@ using System.Runtime.InteropServices;
 namespace QuanTAlib;
 
 /// <summary>
-/// A high-performance OHLCV time series implementation using Structure of Arrays (SoA) layout.
-/// Stores Time, Open, High, Low, Close, Volume in separate contiguous arrays for SIMD efficiency.
-/// Exposes TSeries views for each component that share the underlying Time array.
+/// Performance-focused event args for TBar updates.
+/// Implemented as struct to avoid heap allocations in high-frequency event dispatch.
 /// </summary>
 [StructLayout(LayoutKind.Auto)]
 public readonly struct TBarEventArgs

lib/core/tseries/ITValuePublisher.cs

@@ -1,14 +1,24 @@
 using System;
+using System.Runtime.InteropServices;
 
 namespace QuanTAlib;
 
-public sealed class TValueEventArgs : EventArgs
+/// <summary>
+/// Performance-focused event args for TValue updates.
+/// Implemented as struct to avoid heap allocations in high-frequency event dispatch.
+/// </summary>
+[StructLayout(LayoutKind.Auto)]
+public readonly struct TValueEventArgs
 {
     public TValue Value { get; init; }
     public bool IsNew { get; init; }
 }
 
-public delegate void TValuePublishedHandler(object? sender, TValueEventArgs args);
+// Performance-focused event args struct; not derived from EventArgs by design.
+// We intentionally deviate from the standard EventArgs pattern here for perf.
+#pragma warning disable MA0046 // The second parameter must be of type 'System.EventArgs' or a derived type
+public delegate void TValuePublishedHandler(object? sender, in TValueEventArgs args);
+#pragma warning restore MA0046
 
 /// <summary>
 /// Interface for objects that publish TValue updates.

lib/core/tseries/tseries.cs

@@ -109,8 +109,7 @@ public class TSeries : IReadOnlyList<TValue>, ITValuePublisher
             _v[lastIdx] = value.Value;
         }
 
-        var args = new TValueEventArgs { Value = value, IsNew = isNew };
-        Pub?.Invoke(this, args);
+        Pub?.Invoke(this, new TValueEventArgs { Value = value, IsNew = isNew });
     }
 
     // Overload for backward compatibility (assumes isNew=true)