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/midpoint/Midpoint.Quantower.cs

@@ -0,0 +1,59 @@
+using System.Drawing;
+using TradingPlatform.BusinessLayer;
+using static QuanTAlib.IndicatorExtensions;
+
+namespace QuanTAlib;
+
+/// <summary>
+/// MIDPOINT (Rolling Range Midpoint) Quantower indicator.
+/// Calculates (Highest + Lowest) / 2 over a rolling lookback window.
+/// </summary>
+public class MidpointIndicator : Indicator, IWatchlistIndicator
+{
+    [InputParameter("Period", sortIndex: 0, minimum: 1, maximum: 1000)]
+    public int Period { get; set; } = 14;
+
+    [DataSourceInput]
+    public SourceType Source { get; set; } = SourceType.Close;
+
+    [InputParameter("Show Cold Values", sortIndex: 100)]
+    public bool ShowColdValues { get; set; } = true;
+
+    private Midpoint? _midpoint;
+    private Func<IHistoryItem, double>? _selector;
+
+    public int MinHistoryDepths => Period;
+    public override string ShortName => $"MIDPOINT({Period})";
+
+    public MidpointIndicator()
+    {
+        Name = "MIDPOINT - Rolling Range Midpoint";
+        Description = "Calculates (Highest + Lowest) / 2 over a rolling lookback window";
+        SeparateWindow = false;
+        OnBackGround = true;
+    }
+
+    protected override void OnInit()
+    {
+        _midpoint = new Midpoint(Period);
+        _selector = Source.GetPriceSelector();
+
+        AddLineSeries(new LineSeries("Midpoint", Color.Blue, 2, LineStyle.Solid));
+    }
+
+    protected override void OnUpdate(UpdateArgs args)
+    {
+        if (_midpoint == null || _selector == null) return;
+
+        var item = HistoricalData[0, SeekOriginHistory.End];
+        double value = _selector(item);
+        bool isNew = args.IsNewBar();
+
+        TValue input = new(item.TimeLeft, value);
+        _midpoint.Update(input, isNew);
+
+        bool isHot = _midpoint.IsHot;
+
+        LinesSeries[0].SetValue(_midpoint.Last.Value, isHot, ShowColdValues);
+    }
+}