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/ModbusProtocolOptionsTests.cs

@@ -15,7 +15,15 @@ public sealed class ModbusProtocolOptionsTests
     private sealed class CapturingTransport : IModbusTransport
     {
         public readonly List<byte[]> Sent = new();
+        /// <summary>Asynchronously connects the transport.</summary>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>A completed task.</returns>
         public Task ConnectAsync(CancellationToken ct) => Task.CompletedTask;
+        /// <summary>Asynchronously sends a Modbus PDU and returns a response.</summary>
+        /// <param name="unitId">The Modbus unit ID.</param>
+        /// <param name="pdu">The protocol data unit to send.</param>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>A task that returns the response bytes.</returns>
         public Task<byte[]> SendAsync(byte unitId, byte[] pdu, CancellationToken ct)
         {
             Sent.Add(pdu);
@@ -45,9 +53,12 @@ public sealed class ModbusProtocolOptionsTests
                     return Task.FromResult(new byte[] { pdu[0], 0, 0 });
             }
         }
+        /// <summary>Asynchronously disposes the transport.</summary>
+        /// <returns>A completed task.</returns>
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 
+    /// <summary>Verifies that defaults match historical behavior.</summary>
     [Fact]
     public void Defaults_Match_Historical_Behaviour()
     {
@@ -58,6 +69,7 @@ public sealed class ModbusProtocolOptionsTests
         opts.DisableFC23.ShouldBeFalse();
     }
 
+    /// <summary>Verifies that single coil write uses FC05 by default.</summary>
     [Fact]
     public async Task Single_Coil_Write_Uses_FC05_By_Default()
     {
@@ -71,6 +83,7 @@ public sealed class ModbusProtocolOptionsTests
         fake.Sent.Last()[0].ShouldBe((byte)0x05); // FC05 Write Single Coil
     }
 
+    /// <summary>Verifies that single coil write uses FC15 when forced.</summary>
     [Fact]
     public async Task Single_Coil_Write_Uses_FC15_When_Forced()
     {
@@ -85,6 +98,7 @@ public sealed class ModbusProtocolOptionsTests
         fake.Sent.Last()[0].ShouldBe((byte)0x0F); // FC15 Write Multiple Coils
     }
 
+    /// <summary>Verifies that single register write uses FC06 by default.</summary>
     [Fact]
     public async Task Single_Register_Write_Uses_FC06_By_Default()
     {
@@ -98,6 +112,7 @@ public sealed class ModbusProtocolOptionsTests
         fake.Sent.Last()[0].ShouldBe((byte)0x06); // FC06 Write Single Register
     }
 
+    /// <summary>Verifies that single register write uses FC16 when forced.</summary>
     [Fact]
     public async Task Single_Register_Write_Uses_FC16_When_Forced()
     {
@@ -112,6 +127,7 @@ public sealed class ModbusProtocolOptionsTests
         fake.Sent.Last()[0].ShouldBe((byte)0x10); // FC16 Write Multiple Registers
     }
 
+    /// <summary>Verifies that coil array read automatically chunks at MaxCoilsPerRead.</summary>
     [Fact]
     public async Task Coil_Array_Read_Auto_Chunks_At_MaxCoilsPerRead()
     {