docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptContextTests.cs

@@ -13,6 +13,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests;
 [Trait("Category", "Unit")]
 public sealed class ScriptContextTests
 {
+    /// <summary>Verifies that Deadband returns false when the difference exactly equals the tolerance.</summary>
     [Fact]
     public void Deadband_returns_false_when_difference_equals_tolerance()
     {
@@ -21,6 +22,7 @@ public sealed class ScriptContextTests
         ScriptContext.Deadband(current: 10.5, previous: 10.0, tolerance: 0.5).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that Deadband returns true when the difference exceeds the tolerance.</summary>
     [Fact]
     public void Deadband_returns_true_when_difference_just_exceeds_tolerance()
     {
@@ -28,12 +30,14 @@ public sealed class ScriptContextTests
         ScriptContext.Deadband(current: 10.6, previous: 10.0, tolerance: 0.5).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that Deadband returns false when the difference is below the tolerance.</summary>
     [Fact]
     public void Deadband_returns_false_when_difference_just_below_tolerance()
     {
         ScriptContext.Deadband(current: 10.4, previous: 10.0, tolerance: 0.5).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that Deadband returns the same result regardless of the direction of change.</summary>
     [Fact]
     public void Deadband_is_symmetric_in_direction_of_change()
     {
@@ -42,12 +46,14 @@ public sealed class ScriptContextTests
         ScriptContext.Deadband(current: 11.0, previous: 10.0, tolerance: 0.5).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that Deadband returns false when current and previous values are equal.</summary>
     [Fact]
     public void Deadband_returns_false_when_values_are_equal()
     {
         ScriptContext.Deadband(current: 10.0, previous: 10.0, tolerance: 0.001).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that Deadband with zero tolerance trips on any non-zero difference.</summary>
     [Fact]
     public void Deadband_with_zero_tolerance_returns_true_for_any_difference()
     {
@@ -57,6 +63,7 @@ public sealed class ScriptContextTests
         ScriptContext.Deadband(current: 10.0, previous: 10.000001, tolerance: 0).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that Deadband with negative tolerance trips on any non-zero difference.</summary>
     [Fact]
     public void Deadband_with_negative_tolerance_always_trips_for_unequal_values()
     {