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.AbLegacy.Tests/AbLegacyRuntimeConcurrencyTests.cs

@@ -22,10 +22,17 @@ public sealed class AbLegacyRuntimeConcurrencyTests
     private sealed class OverlapDetectingFake : FakeAbLegacyTag
     {
         private int _inFlight;
+
+        /// <summary>Gets the maximum number of concurrent operations detected.</summary>
         public int MaxConcurrent { get; private set; }
 
+        /// <summary>Initializes a new instance of the OverlapDetectingFake class.</summary>
+        /// <param name="p">The tag creation parameters.</param>
         public OverlapDetectingFake(AbLegacyTagCreateParams p) : base(p) { }
 
+        /// <summary>Reads the tag asynchronously while tracking concurrent operations.</summary>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>A task representing the read operation.</returns>
         public override async Task ReadAsync(CancellationToken ct)
         {
             EnterOp();
@@ -38,6 +45,9 @@ public sealed class AbLegacyRuntimeConcurrencyTests
             finally { LeaveOp(); }
         }
 
+        /// <summary>Writes to the tag asynchronously while tracking concurrent operations.</summary>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>A task representing the write operation.</returns>
         public override async Task WriteAsync(CancellationToken ct)
         {
             EnterOp();
@@ -58,6 +68,7 @@ public sealed class AbLegacyRuntimeConcurrencyTests
         private void LeaveOp() => Interlocked.Decrement(ref _inFlight);
     }
 
+    /// <summary>Verifies that concurrent reads of the same tag are serialised against the shared runtime.</summary>
     [Fact]
     public async Task Concurrent_reads_of_same_tag_are_serialised_against_the_shared_runtime()
     {
@@ -90,6 +101,7 @@ public sealed class AbLegacyRuntimeConcurrencyTests
         reads.ShouldAllBe(r => r.Result.Single().Value!.Equals(7));
     }
 
+    /// <summary>Verifies that concurrent read and write operations on the same tag do not overlap.</summary>
     [Fact]
     public async Task Concurrent_read_and_write_of_same_tag_do_not_overlap()
     {