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.AbCip.Tests/AbCipStatusMapperTests.cs

@@ -8,6 +8,9 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests;
 [Trait("Category", "Unit")]
 public sealed class AbCipStatusMapperTests
 {
+    /// <summary>Verifies that CIP general status codes are mapped to OPC UA status codes.</summary>
+    /// <param name="status">The raw CIP general status byte.</param>
+    /// <param name="expected">The expected OPC UA status code.</param>
     [Theory]
     [InlineData((byte)0x00, AbCipStatusMapper.Good)]
     [InlineData((byte)0x04, AbCipStatusMapper.BadNodeIdUnknown)]
@@ -29,6 +32,9 @@ public sealed class AbCipStatusMapperTests
     // Driver.AbCip-002 — the integers here are the underlying values of the libplctag.NET
     // Status enum (what (int)Tag.GetStatus() actually returns), NOT raw native PLCTAG_ERR_*
     // constants. The libplctag.NET wrapper renumbers the native codes into a contiguous enum.
+    /// <summary>Verifies that libplctag Status enum values are mapped to OPC UA status codes.</summary>
+    /// <param name="status">The libplctag Status enum value to map.</param>
+    /// <param name="expected">The expected OPC UA status code.</param>
     [Theory]
     [InlineData(Status.Ok, AbCipStatusMapper.Good)]
     [InlineData(Status.Pending, AbCipStatusMapper.GoodMoreData)]
@@ -47,6 +53,7 @@ public sealed class AbCipStatusMapperTests
         AbCipStatusMapper.MapLibplctagStatus((int)status).ShouldBe(expected);
     }
 
+    /// <summary>Verifies that timeout is distinguished from generic communication error.</summary>
     [Fact]
     public void MapLibplctagStatus_distinguishes_timeout_from_generic_comms_error()
     {