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/ModbusCapTests.cs

@@ -13,12 +13,17 @@ public sealed class ModbusCapTests
     /// </summary>
     private sealed class RecordingTransport : IModbusTransport
     {
+        /// <summary>Gets the simulated holding register storage.</summary>
         public readonly ushort[] HoldingRegisters = new ushort[1024];
+        /// <summary>Gets the list of all FC03 read requests made to the transport.</summary>
         public readonly List<(ushort Address, ushort Quantity)> Fc03Requests = new();
+        /// <summary>Gets the list of all FC16 write requests made to the transport.</summary>
         public readonly List<(ushort Address, ushort Quantity)> Fc16Requests = new();
 
+        /// <inheritdoc />
         public Task ConnectAsync(CancellationToken ct) => Task.CompletedTask;
 
+        /// <inheritdoc />
         public Task<byte[]> SendAsync(byte unitId, byte[] pdu, CancellationToken ct)
         {
             var fc = pdu[0];
@@ -50,9 +55,11 @@ public sealed class ModbusCapTests
             return Task.FromException<byte[]>(new ModbusException(fc, 0x01, $"fc={fc} unsupported"));
         }
 
+        /// <inheritdoc />
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 
+    /// <summary>Verifies that a read within the cap issues a single FC03 request.</summary>
     [Fact]
     public async Task Read_within_cap_issues_single_FC03_request()
     {
@@ -69,6 +76,7 @@ public sealed class ModbusCapTests
         transport.Fc03Requests[0].Quantity.ShouldBe((ushort)20);
     }
 
+    /// <summary>Verifies that a read above cap splits into two FC03 requests.</summary>
     [Fact]
     public async Task Read_above_cap_splits_into_two_FC03_requests()
     {
@@ -103,6 +111,7 @@ public sealed class ModbusCapTests
         s[0].ShouldBe('A'); // register[100] high byte
     }
 
+    /// <summary>Verifies that read cap honors Mitsubishi lower cap of 64 registers.</summary>
     [Fact]
     public async Task Read_cap_honors_Mitsubishi_lower_cap_of_64()
     {
@@ -121,6 +130,7 @@ public sealed class ModbusCapTests
         transport.Fc03Requests[1].Quantity.ShouldBe((ushort)36);
     }
 
+    /// <summary>Verifies that write exceeding cap throws instead of splitting.</summary>
     [Fact]
     public async Task Write_exceeding_cap_throws_instead_of_splitting()
     {
@@ -144,6 +154,7 @@ public sealed class ModbusCapTests
         transport.Fc16Requests.Count.ShouldBe(0);
     }
 
+    /// <summary>Verifies that write within cap proceeds normally.</summary>
     [Fact]
     public async Task Write_within_cap_proceeds_normally()
     {