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/Server/ZB.MOM.WW.OtOpcUa.ControlPlane.Tests/ConfigPublishCoordinatorTests.cs

@@ -13,6 +13,7 @@ public sealed class ConfigPublishCoordinatorTests : ControlPlaneActorTestBase
 {
     private static readonly RevisionHash TestRevision = RevisionHash.Parse(new string('a', 64));
 
+    /// <summary>Verifies that deployment seals immediately when no driver-role members are in the cluster.</summary>
     [Fact]
     public void EmptyCluster_dispatch_seals_immediately()
     {
@@ -32,6 +33,7 @@ public sealed class ConfigPublishCoordinatorTests : ControlPlaneActorTestBase
         }, duration: TimeSpan.FromSeconds(3));
     }
 
+    /// <summary>Verifies that stale apply acknowledgments arriving after seal are ignored.</summary>
     [Fact]
     public void Stale_ApplyAck_after_seal_is_ignored()
     {