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.Historian.Wonderware.Tests/Ipc/PipeServerSidRejectTests.cs

@@ -26,6 +26,7 @@ public sealed class PipeServerSidRejectTests
 {
     private static readonly ILogger Quiet = Logger.None;
 
+    /// <summary>Verifies that a caller SID mismatch sends HelloAck with reject reason before disconnect.</summary>
     [Fact]
     public async Task Caller_SID_mismatch_sends_HelloAck_with_reject_reason_before_disconnect()
     {
@@ -74,6 +75,12 @@ public sealed class PipeServerSidRejectTests
     /// <summary>Handler that asserts it is never called — the connection must be rejected at Hello.</summary>
     private sealed class NoopHandler : IFrameHandler
     {
+        /// <summary>Throws if called, as the connection should be rejected before reaching this handler.</summary>
+        /// <param name="kind">The message kind (unused).</param>
+        /// <param name="body">The message body (unused).</param>
+        /// <param name="writer">The frame writer (unused).</param>
+        /// <param name="ct">Cancellation token (unused).</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task HandleAsync(MessageKind kind, byte[] body, FrameWriter writer, CancellationToken ct)
         {
             throw new InvalidOperationException(