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/numerics/relu/Relu.Quantower.cs

@@ -0,0 +1,56 @@
+using System.Drawing;
+using TradingPlatform.BusinessLayer;
+using static QuanTAlib.IndicatorExtensions;
+
+namespace QuanTAlib;
+
+/// <summary>
+/// RELU (Rectified Linear Unit) Quantower indicator.
+/// Applies max(0, x) transformation to input values.
+/// </summary>
+public class ReluIndicator : Indicator, IWatchlistIndicator
+{
+    [DataSourceInput]
+    public SourceType Source { get; set; } = SourceType.Close;
+
+    [InputParameter("Show Cold Values", sortIndex: 100)]
+    public bool ShowColdValues { get; set; } = true;
+
+    private Relu? _relu;
+    private Func<IHistoryItem, double>? _selector;
+
+    public int MinHistoryDepths => 1;
+    public override string ShortName => "RELU";
+
+    public ReluIndicator()
+    {
+        Name = "RELU - Rectified Linear Unit";
+        Description = "Applies max(0, x) transformation to input values";
+        SeparateWindow = true;
+        OnBackGround = true;
+    }
+
+    protected override void OnInit()
+    {
+        _relu = new Relu();
+        _selector = Source.GetPriceSelector();
+
+        AddLineSeries(new LineSeries("ReLU", Color.Green, 2, LineStyle.Solid));
+    }
+
+    protected override void OnUpdate(UpdateArgs args)
+    {
+        if (_relu == null || _selector == null) return;
+
+        var item = HistoricalData[0, SeekOriginHistory.End];
+        double value = _selector(item);
+        bool isNew = args.IsNewBar();
+
+        TValue input = new(item.TimeLeft, value);
+        _relu.Update(input, isNew);
+
+        bool isHot = _relu.IsHot;
+
+        LinesSeries[0].SetValue(_relu.Last.Value, isHot, ShowColdValues);
+    }
+}