SIMD Refactor: Merge simd-dev into dev (#55)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: aider (openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>
Co-authored-by: Warp <agent@warp.dev>

lib/core/tseries/ITValuePublisher.cs

@@ -0,0 +1,52 @@
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace QuanTAlib;
+
+/// <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 : IEquatable<TValueEventArgs>
+{
+    public TValue Value { get; init; }
+    public bool IsNew { get; init; }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(TValueEventArgs other) =>
+        Value.Equals(other.Value) && IsNew == other.IsNew;
+
+    public override bool Equals(object? obj) =>
+        obj is TValueEventArgs other && Equals(other);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public override int GetHashCode() =>
+        HashCode.Combine(Value, IsNew);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static bool operator ==(TValueEventArgs left, TValueEventArgs right) =>
+        left.Equals(right);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static bool operator !=(TValueEventArgs left, TValueEventArgs right) =>
+        !left.Equals(right);
+}
+
+// Performance-focused event args struct; not derived from EventArgs by design.
+// We intentionally deviate from the standard EventArgs pattern here for perf.
+// MA0046 suppressed: struct-based args avoid heap allocations in high-frequency events.
+#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);
+
+/// <summary>
+/// Interface for objects that publish TValue updates.
+/// </summary>
+public interface ITValuePublisher
+{
+    /// <summary>
+    /// Event triggered when a new TValue is available.
+    /// </summary>
+    event TValuePublishedHandler? Pub;
+}
+#pragma warning restore MA0046