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.

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/Helpers/SecurityModeMapper.cs

@@ -8,9 +8,9 @@ namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Helpers;
 /// </summary>
 public static class SecurityModeMapper
 {
-    /// <summary>
-    ///     Converts a <see cref="SecurityMode" /> to an OPC UA <see cref="MessageSecurityMode" />.
-    /// </summary>
+    /// <summary>Converts a SecurityMode to an OPC UA MessageSecurityMode.</summary>
+    /// <param name="mode">The security mode to convert.</param>
+    /// <returns>The corresponding message security mode.</returns>
     public static MessageSecurityMode ToMessageSecurityMode(SecurityMode mode)
     {
         return mode switch