docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus/ModbusTcpTransport.cs

@@ -63,8 +63,7 @@ public sealed class ModbusTcpTransport : IModbusTransport
         _reconnect = reconnect ?? new ModbusReconnectOptions();
     }
 
-    /// <summary>Connects to the Modbus TCP server with IPv4 preference.</summary>
-    /// <param name="ct">The cancellation token for the operation.</param>
+    /// <inheritdoc />
     public async Task ConnectAsync(CancellationToken ct)
     {
         // Resolve the host explicitly + prefer IPv4. .NET's TcpClient default-constructor is
@@ -101,7 +100,7 @@ public sealed class ModbusTcpTransport : IModbusTransport
         try
         {
             client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
-            // Driver.Modbus-009: a TimeSpan < 1s previously truncated to 0 via the int cast,
+            // A TimeSpan < 1s previously truncated to 0 via the int cast,
             // which Windows / Linux interpret as "use the default" — silently defeating the
             // configured keep-alive timing. Round up to at least 1 second so a sub-second
             // configuration still produces a real keep-alive cadence. Negative values are
@@ -116,21 +115,19 @@ public sealed class ModbusTcpTransport : IModbusTransport
     }
 
     /// <summary>
-    ///     Driver.Modbus-009: cast a <see cref="TimeSpan"/> to a whole number of seconds with a
-    ///     minimum of 1 — protects callers from the int-cast truncation that turned 500&#160;ms
+    ///     Cast a <see cref="TimeSpan"/> to a whole number of seconds with a
+    ///     minimum of 1 — protects callers from the int-cast truncation that turned 500 ms
     ///     keep-alive timing into "use the default" on most OSes.
     /// </summary>
     /// <param name="ts">The timespan to clamp to whole seconds.</param>
+    /// <returns>The clamped duration expressed as a whole number of seconds, never less than 1.</returns>
     internal static int ClampToWholeSeconds(TimeSpan ts)
     {
         var seconds = (int)Math.Ceiling(ts.TotalSeconds);
         return seconds < 1 ? 1 : seconds;
     }
 
-    /// <summary>Sends a Modbus PDU and returns the response, with automatic retry on socket failure.</summary>
-    /// <param name="unitId">The Modbus unit/slave ID.</param>
-    /// <param name="pdu">The protocol data unit to send.</param>
-    /// <param name="ct">The cancellation token for the operation.</param>
+    /// <inheritdoc />
     public async Task<byte[]> SendAsync(byte unitId, byte[] pdu, CancellationToken ct)
     {
         if (_disposed) throw new ObjectDisposedException(nameof(ModbusTcpTransport));
@@ -284,6 +281,7 @@ public sealed class ModbusTcpTransport : IModbusTransport
     }
 
     /// <summary>Asynchronously disposes the transport and underlying socket resources.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public async ValueTask DisposeAsync()
     {
         if (_disposed) return;