docs: remove C# Implementation Considerations sections, clean up temp scripts, reorganize test files

- Remove 'C# Implementation Considerations' sections from 34 indicator .md files
- Delete 29 temp PowerShell scripts (_fix_mojibake.ps1, _hex_scan.ps1, etc.)
- Move test files into tests/ subdirectories for consistent project structure
- Add trader-focused bullet points to indicator documentation

lib/dynamics/adx/tests/Adx.Quantower.Tests.cs

@@ -0,0 +1,65 @@
+using TradingPlatform.BusinessLayer;
+using QuanTAlib;
+
+namespace QuanTAlib.Tests;
+
+public class AdxIndicatorTests
+{
+    [Fact]
+    public void AdxIndicator_Constructor_SetsDefaults()
+    {
+        var indicator = new AdxIndicator();
+
+        Assert.Equal(14, indicator.Period);
+        Assert.True(indicator.ShowColdValues);
+        Assert.Equal("ADX - Average Directional Index", indicator.Name);
+        Assert.True(indicator.SeparateWindow);
+        Assert.True(indicator.OnBackGround);
+    }
+
+    [Fact]
+    public void AdxIndicator_MinHistoryDepths_EqualsZero()
+    {
+        var indicator = new AdxIndicator { Period = 20 };
+
+        Assert.Equal(0, AdxIndicator.MinHistoryDepths);
+        IWatchlistIndicator watchlistIndicator = indicator;
+        Assert.Equal(0, watchlistIndicator.MinHistoryDepths);
+    }
+
+    [Fact]
+    public void AdxIndicator_Initialize_CreatesInternalAdx()
+    {
+        var indicator = new AdxIndicator { Period = 14 };
+
+        // Initialize should not throw
+        indicator.Initialize();
+
+        // After init, line series should exist (ADX, +DI, -DI)
+        Assert.Equal(3, indicator.LinesSeries.Count);
+    }
+
+    [Fact]
+    public void AdxIndicator_ProcessUpdate_HistoricalBar_ComputesValue()
+    {
+        var indicator = new AdxIndicator { Period = 5 };
+        indicator.Initialize();
+
+        // Add historical data
+        var now = DateTime.UtcNow;
+        // Need enough bars for Period
+        for (int i = 0; i < 20; i++)
+        {
+            indicator.HistoricalData.AddBar(now.AddMinutes(i), 100 + i, 110 + i, 90 + i, 105 + i);
+
+            // Process update for each bar to simulate history loading
+            var args = new UpdateArgs(UpdateReason.HistoricalBar);
+            indicator.ProcessUpdate(args);
+        }
+
+        // Line series should have a value
+        double adx = indicator.LinesSeries[0].GetValue(0);
+
+        Assert.True(double.IsFinite(adx));
+    }
+}