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/AbstractBase.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace QuanTAlib;
+
+/// <summary>
+/// Abstract base class for all indicators.
+/// Enforces a consistent contract for State, Name, WarmupPeriod, and core methods.
+/// </summary>
+public abstract class AbstractBase : ITValuePublisher, IDisposable
+{
+    /// <summary>
+    /// Display name for the indicator.
+    /// </summary>
+    public string Name { get; protected init; } = string.Empty;
+
+    /// <summary>
+    /// Number of periods before the indicator is considered "hot" (valid).
+    /// </summary>
+    public int WarmupPeriod { get; protected init; }
+
+    /// <summary>
+    /// Current value of the indicator.
+    /// </summary>
+    public TValue Last { get; protected set; }
+
+    /// <summary>
+    /// True if the indicator has enough data to produce valid results.
+    /// </summary>
+    public abstract bool IsHot { get; }
+
+    /// <summary>
+    /// Event triggered when a new TValue is available.
+    /// </summary>
+    public event TValuePublishedHandler? Pub;
+
+    /// <summary>
+    /// Helper to invoke the Pub event.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected void PubEvent(TValue value, bool isNew = true)
+    {
+        Pub?.Invoke(this, new TValueEventArgs { Value = value, IsNew = isNew });
+    }
+
+    /// <summary>
+    /// Initializes the indicator state using the provided history.
+    /// </summary>
+    /// <param name="source">Historical data</param>
+    /// <param name="step">Time interval between values (default: 1 second)</param>
+    public abstract void Prime(ReadOnlySpan<double> source, TimeSpan? step = null);
+
+    /// <summary>
+    /// Updates the indicator with a single value.
+    /// </summary>
+    /// <param name="input">Input value</param>
+    /// <param name="isNew">True if this is a new bar, False if it's an update to the last bar</param>
+    /// <returns>Updated value</returns>
+    public abstract TValue Update(TValue input, bool isNew = true);
+
+    /// <summary>
+    /// Updates the indicator with a series of values.
+    /// </summary>
+    /// <param name="source">Input series</param>
+    /// <returns>Series of calculated values</returns>
+    public abstract TSeries Update(TSeries source);
+
+    /// <summary>
+    /// Resets the indicator to its initial state.
+    /// </summary>
+    public abstract void Reset();
+
+    public void Dispose()
+    {
+        Dispose(disposing: true);
+        GC.SuppressFinalize(this);
+    }
+
+    protected virtual void Dispose(bool disposing)
+    {
+    }
+}