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/Cli/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Cli.Tests/WriteCommandRegionValidationTests.cs

@@ -17,6 +17,10 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.Cli.Tests;
 [Trait("Category", "Unit")]
 public sealed class WriteCommandRegionValidationTests
 {
+    /// <summary>Verifies that write to read-only regions is rejected before reaching the driver.</summary>
+    /// <param name="region">The read-only Modbus region to attempt a write against.</param>
+    /// <param name="type">The data type used in the write attempt.</param>
+    /// <param name="value">The raw string value supplied to the write command.</param>
     [Theory]
     [InlineData(ModbusRegion.DiscreteInputs, ModbusDataType.Bool, "0")]
     [InlineData(ModbusRegion.InputRegisters, ModbusDataType.UInt16, "1")]
@@ -38,6 +42,8 @@ public sealed class WriteCommandRegionValidationTests
             async () => await sut.ExecuteAsync(console));
     }
 
+    /// <summary>Verifies that Coils region requires Bool data type (Driver.Modbus.Cli-002).</summary>
+    /// <param name="type">The non-Bool data type that should be rejected for the Coils region.</param>
     [Theory]
     [InlineData(ModbusDataType.UInt16)]
     [InlineData(ModbusDataType.Int16)]