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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Addressing.Tests/ModbusModiconAddressTests.cs

@@ -7,6 +7,10 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.Addressing.Tests;
 [Trait("Category", "Unit")]
 public sealed class ModbusModiconAddressTests
 {
+    /// <summary>Verifies that valid Modicon addresses parse correctly to region and offset.</summary>
+    /// <param name="address">The Modicon address string to parse.</param>
+    /// <param name="expectedRegion">The expected Modbus region.</param>
+    /// <param name="expectedOffset">The expected PDU offset.</param>
     [Theory]
     // 5-digit form, one per region. Trailing 4 digits = 1-based register; PDU offset is one less.
     [InlineData("00001", ModbusRegion.Coils,            (ushort)0)]
@@ -31,6 +35,9 @@ public sealed class ModbusModiconAddressTests
         offset.ShouldBe(expectedOffset);
     }
 
+    /// <summary>Verifies that invalid addresses produce diagnostic error messages.</summary>
+    /// <param name="address">The invalid address string to test.</param>
+    /// <param name="fragment">The expected diagnostic fragment in the exception message.</param>
     [Theory]
     [InlineData("",        "null or empty")]
     [InlineData("   ",     "null or empty")]
@@ -49,6 +56,7 @@ public sealed class ModbusModiconAddressTests
             .Message.ShouldContain(fragment, Case.Insensitive);
     }
 
+    /// <summary>Verifies that TryParse returns false with a diagnostic error on invalid input.</summary>
     [Fact]
     public void TryParse_Returns_False_With_Diagnostic_On_Invalid()
     {
@@ -57,6 +65,7 @@ public sealed class ModbusModiconAddressTests
         error.ShouldNotBeNull();
     }
 
+    /// <summary>Verifies that TryParse returns true with null error on valid input.</summary>
     [Fact]
     public void TryParse_Returns_True_With_Null_Error_On_Valid()
     {
@@ -67,6 +76,7 @@ public sealed class ModbusModiconAddressTests
         error.ShouldBeNull();
     }
 
+    /// <summary>Verifies that TryParse handles null input gracefully.</summary>
     [Fact]
     public void TryParse_Handles_Null()
     {
@@ -74,6 +84,7 @@ public sealed class ModbusModiconAddressTests
         error.ShouldNotBeNull();
     }
 
+    /// <summary>Verifies that TryParse trims leading and trailing whitespace.</summary>
     [Fact]
     public void TryParse_Trims_Whitespace()
     {