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/oscillators/rvgi/Rvgi.Quantower.cs

@@ -27,7 +27,7 @@ public sealed class RvgiIndicator : Indicator, IWatchlistIndicator
     {
         OnBackGround = true;
         SeparateWindow = true;
-        Name = "RVGI - Relative Vigor Index";
+        Name = "RVGI - Ehlers Relative Vigor Index";
         Description = "Dual-output oscillator comparing closing strength to the full bar range, smoothed via 4-tap SWMA and averaged over a period. RVGI > 0 in uptrends, < 0 in downtrends.";
 
         _rvgiLine = new LineSeries("RVGI", Color.Yellow, 2, LineStyle.Solid);

lib/oscillators/rvgi/Rvgi.cs

@@ -10,7 +10,7 @@ using System.Runtime.InteropServices;
 namespace QuanTAlib;
 
 /// <summary>
-/// RVGI: Relative Vigor Index
+/// RVGI: Ehlers Relative Vigor Index
 /// </summary>
 /// <remarks>
 /// Dual-output oscillator built in four stages:

lib/oscillators/rvgi/Rvgi.md

@@ -1,4 +1,4 @@
-# RVGI: Relative Vigor Index
+# RVGI: Ehlers Relative Vigor Index
 
 > *Relative Vigor Index compares the close-open range to the high-low range, measuring conviction in each bar's direction.*
 

lib/oscillators/rvgi/tests/Rvgi.Quantower.Tests.cs

@@ -12,7 +12,7 @@ public sealed class RvgiIndicatorTests
 
         Assert.Equal(10, indicator.Period);
         Assert.True(indicator.ShowColdValues);
-        Assert.Equal("RVGI - Relative Vigor Index", indicator.Name);
+        Assert.Equal("RVGI - Ehlers Relative Vigor Index", indicator.Name);
         Assert.True(indicator.SeparateWindow);
         Assert.True(indicator.OnBackGround);
     }