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.Tests/ModbusByteOrderTests.cs

@@ -10,6 +10,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests;
 [Trait("Category", "Unit")]
 public sealed class ModbusByteOrderTests
 {
+    /// <summary>Verifies that Int32 values decode correctly with ByteSwap (BADC) byte order.</summary>
     [Fact]
     public void Int32_ByteSwap_decodes_BADC_layout()
     {
@@ -21,6 +22,7 @@ public sealed class ModbusByteOrderTests
         ModbusDriver.DecodeRegister(bytes, tag).ShouldBe(0x12345678);
     }
 
+    /// <summary>Verifies that Int32 values decode correctly with FullReverse (DCBA) byte order.</summary>
     [Fact]
     public void Int32_FullReverse_decodes_DCBA_layout()
     {
@@ -32,6 +34,8 @@ public sealed class ModbusByteOrderTests
         ModbusDriver.DecodeRegister(bytes, tag).ShouldBe(0x12345678);
     }
 
+    /// <summary>Verifies that Float32 values roundtrip correctly with all byte orders.</summary>
+    /// <param name="order">The byte order to test.</param>
     [Theory]
     [InlineData(ModbusByteOrder.BigEndian)]
     [InlineData(ModbusByteOrder.WordSwap)]
@@ -45,6 +49,8 @@ public sealed class ModbusByteOrderTests
         ModbusDriver.DecodeRegister(wire, tag).ShouldBe(3.14159f);
     }
 
+    /// <summary>Verifies that Float64 values roundtrip correctly with all byte orders.</summary>
+    /// <param name="order">The byte order to test.</param>
     [Theory]
     [InlineData(ModbusByteOrder.BigEndian)]
     [InlineData(ModbusByteOrder.WordSwap)]
@@ -58,6 +64,8 @@ public sealed class ModbusByteOrderTests
         ModbusDriver.DecodeRegister(wire, tag).ShouldBe(2.718281828459045d);
     }
 
+    /// <summary>Verifies that Int32 values roundtrip correctly with all byte orders.</summary>
+    /// <param name="order">The byte order to test.</param>
     [Theory]
     [InlineData(ModbusByteOrder.BigEndian)]
     [InlineData(ModbusByteOrder.WordSwap)]