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/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions.Tests/InterfaceIndependenceTests.cs

@@ -14,6 +14,7 @@ public sealed class InterfaceIndependenceTests
 {
     private static readonly Assembly Assembly = typeof(IDriver).Assembly;
 
+    /// <summary>Verifies that the assembly has no references outside the BCL.</summary>
     [Fact]
     public void Assembly_HasNoReferencesOutsideBcl()
     {
@@ -37,6 +38,7 @@ public sealed class InterfaceIndependenceTests
             $"Found disallowed references: {string.Join(", ", disallowed.Select(a => a.Name))}");
     }
 
+    /// <summary>Verifies that all public types live in the root namespace.</summary>
     [Fact]
     public void AllPublicTypes_LiveInRootNamespace()
     {
@@ -51,6 +53,8 @@ public sealed class InterfaceIndependenceTests
             $"Found types in other namespaces: {string.Join(", ", nonRoot.Select(t => $"{t.FullName}"))}");
     }
 
+    /// <summary>Verifies that every capability interface is public.</summary>
+    /// <param name="type">The interface type to check.</param>
     [Theory]
     [InlineData(typeof(IDriver))]
     [InlineData(typeof(ITagDiscovery))]