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/AbLegacyBitRmwTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Tests;
 [Trait("Category", "Unit")]
 public sealed class AbLegacyBitRmwTests
 {
+    /// <summary>Verifies that setting a bit reads the parent word, ORs the bit, and writes back.</summary>
     [Fact]
     public async Task Bit_set_reads_parent_word_ORs_bit_writes_back()
     {
@@ -31,6 +32,7 @@ public sealed class AbLegacyBitRmwTests
         Convert.ToInt32(factory.Tags["N7:0"].Value).ShouldBe(0b1001);
     }
 
+    /// <summary>Verifies that clearing a bit preserves other bits in the word.</summary>
     [Fact]
     public async Task Bit_clear_preserves_other_bits_in_N_file_word()
     {
@@ -51,6 +53,7 @@ public sealed class AbLegacyBitRmwTests
         Convert.ToInt32(factory.Tags["N7:0"].Value).ShouldBe(unchecked((short)0xFFF7));
     }
 
+    /// <summary>Verifies that concurrent bit writes to the same word compose correctly.</summary>
     [Fact]
     public async Task Concurrent_bit_writes_to_same_word_compose_correctly()
     {
@@ -75,6 +78,7 @@ public sealed class AbLegacyBitRmwTests
         Convert.ToInt32(factory.Tags["N7:0"].Value).ShouldBe(0xFF);
     }
 
+    /// <summary>Verifies that repeated bit writes reuse the parent word runtime.</summary>
     [Fact]
     public async Task Repeat_bit_writes_reuse_parent_runtime()
     {