Add "Ehlers" prefix to 5 Ehlers indicators: SAM, PMA, ILRS, CTI, RVGI

Standardize naming convention so all Ehlers-originated indicators
have "Ehlers" in their display name across all documentation and
code surfaces:

- SAM: Smoothed Adaptive Momentum → Ehlers Smoothed Adaptive Momentum
- PMA: Predictive Moving Average → Ehlers Predictive Moving Average
- ILRS: Integral of LinReg Slope → Ehlers Integral of LinReg Slope
- CTI: Correlation Trend Indicator → Ehlers Correlation Trend Indicator
- RVGI: Relative Vigor Index → Ehlers Relative Vigor Index

Updated across: .md H1 titles, XML doc summaries, Quantower Name
properties, Quantower test assertions, _sidebar.md, lib/_index.md,
category _index.md files, docs/indicators.md, docs/validation.md.

Build: 0 warnings, 0 errors. All tests pass.

lib/trends_FIR/ilrs/Ilrs.Quantower.cs

@@ -31,7 +31,7 @@ public sealed class IlrsIndicator : Indicator, IWatchlistIndicator
     {
         OnBackGround = true;
         SeparateWindow = false;
-        Name = "ILRS - Integral of Linear Regression Slope";
+        Name = "ILRS - Ehlers Integral of Linear Regression Slope";
         Description = "Cumulative sum of rolling linear regression slope (Ehlers)";
         _series = new LineSeries(name: $"ILRS {Period}", color: IndicatorExtensions.Averages, width: 2, style: LineStyle.Solid);
         AddLineSeries(_series);

lib/trends_FIR/ilrs/Ilrs.cs

@@ -4,7 +4,7 @@ using System.Runtime.InteropServices;
 namespace QuanTAlib;
 
 /// <summary>
-/// ILRS: Integral of Linear Regression Slope
+/// ILRS: Ehlers Integral of Linear Regression Slope
 /// </summary>
 /// <remarks>
 /// Computes the linear regression slope over a rolling window, then accumulates

lib/trends_FIR/ilrs/Ilrs.md

@@ -1,4 +1,4 @@
-# ILRS: Integral of Linear Regression Slope
+# ILRS: Ehlers Integral of Linear Regression Slope
 
 > *John Ehlers took the slope of a regression line, integrated it, and got a smoother trend follower. Differentiate to find direction, integrate to find position. Calculus: still useful after 300 years.*
 

lib/trends_FIR/ilrs/tests/Ilrs.Quantower.Tests.cs

@@ -12,7 +12,7 @@ public class IlrsIndicatorTests
         Assert.Equal(14, indicator.Period);
         Assert.Equal(SourceType.Close, indicator.Source);
         Assert.True(indicator.ShowColdValues);
-        Assert.Equal("ILRS - Integral of Linear Regression Slope", indicator.Name);
+        Assert.Equal("ILRS - Ehlers Integral of Linear Regression Slope", indicator.Name);
         Assert.False(indicator.SeparateWindow);
         Assert.True(indicator.OnBackGround);
     }