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.S7.Tests/S7DriverReadWriteTests.cs

@@ -13,6 +13,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests;
 [Trait("Category", "Unit")]
 public sealed class S7DriverReadWriteTests
 {
+    /// <summary>Verifies that initialization rejects invalid tag addresses and fails fast.</summary>
     [Fact]
     public async Task Initialize_rejects_invalid_tag_address_and_fails_fast()
     {
@@ -34,6 +35,7 @@ public sealed class S7DriverReadWriteTests
             await drv.InitializeAsync("{}", TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies that ReadAsync without initialize throws InvalidOperationException.</summary>
     [Fact]
     public async Task ReadAsync_without_initialize_throws_InvalidOperationException()
     {
@@ -42,6 +44,7 @@ public sealed class S7DriverReadWriteTests
             await drv.ReadAsync(["Any"], TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies that WriteAsync without initialize throws InvalidOperationException.</summary>
     [Fact]
     public async Task WriteAsync_without_initialize_throws_InvalidOperationException()
     {