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.Historian.Gateway/Recorder/GatewayHistorianValueWriter.cs

@@ -91,5 +91,6 @@ public sealed class GatewayHistorianValueWriter : IHistorianValueWriter, IAsyncD
     ///     Disposes the underlying gateway client (and its gRPC channel). The DI container owns this
     ///     writer as a singleton, so this fires once at host shutdown — closing the channel gracefully.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public ValueTask DisposeAsync() => _client.DisposeAsync();
 }

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway/Recorder/HistorizationOutboxEntrySerializer.cs

@@ -18,6 +18,8 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway.Recorder;
 internal static class HistorizationOutboxEntrySerializer
 {
     /// <summary>Serializes <paramref name="entry"/> to a fixed-layout little-endian byte array.</summary>
+    /// <param name="entry">The outbox entry to serialize.</param>
+    /// <returns>The fixed-layout little-endian byte array.</returns>
     public static byte[] Serialize(HistorizationOutboxEntry entry)
     {
         ArgumentNullException.ThrowIfNull(entry);
@@ -41,6 +43,8 @@ internal static class HistorizationOutboxEntrySerializer
     }
 
     /// <summary>Reconstructs a <see cref="HistorizationOutboxEntry"/> from its serialized bytes.</summary>
+    /// <param name="span">The fixed-layout little-endian bytes produced by <see cref="Serialize"/>.</param>
+    /// <returns>The reconstructed outbox entry.</returns>
     public static HistorizationOutboxEntry Deserialize(ReadOnlySpan<byte> span)
     {
         var id = new Guid(span[..16]);