feat: Add new CodeQL extension for C# and SonarLint configuration

- Introduced a new CodeQL extension for C# in `.github/codeql/extensions/quantalib-csharp/codeql-pack.yml`.
- Added SonarLint configuration in `.sonarlint/CSharp/SonarLint.xml` and `.sonarlint/csharp.ruleset` to suppress specific rules for high-performance indicators.
- Removed outdated `.vscode/launch.json` configurations.
- Updated `.vscode/tasks.json` to streamline build and test tasks, including renaming and consolidating tasks.
- Modified `Directory.Build.props` to enhance SARIF output directory handling and integrate SonarLint rules.
- Refactored various indicator classes to improve code clarity and maintainability, including updates to method parameters for consistency.
- Added XML documentation comments to several classes and methods for better code understanding.
- Improved numerical stability in calculations by replacing direct comparisons with `double.Epsilon` checks in multiple classes.

lib/channels/maenv/Maenv.cs

@@ -289,7 +289,7 @@ public sealed class Maenv : ITValuePublisher
     private double CalculateEMA(double value, bool isNew)
     {
         // Use EmaWeight==0 to detect first value for correct isNew=false behavior
-        if (_state.EmaWeight == 0)
+        if (Math.Abs(_state.EmaWeight) < double.Epsilon)
         {
             // First value - persist only for isNew=true
             if (isNew)

lib/channels/sdchannel/Sdchannel.cs

@@ -75,6 +75,9 @@ public sealed class Sdchannel : ITValuePublisher
 
     public event TValuePublishedHandler? Pub;
 
+    /// <summary>
+    /// Initializes a new Standard Deviation Channel indicator with specified period and multiplier.
+    /// </summary>
     /// <param name="period">Lookback period for regression (default 20, must be > 1)</param>
     /// <param name="multiplier">Standard deviation multiplier for bands (default 2.0, must be > 0)</param>
     public Sdchannel(int period = 20, double multiplier = 2.0)