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/ConfigPublishCoordinatorTimeoutTests.cs

@@ -15,6 +15,7 @@ public sealed class ConfigPublishCoordinatorTimeoutTests : ControlPlaneActorTest
 {
     private static readonly RevisionHash TestRevision = RevisionHash.Parse(new string('b', 64));
 
+    /// <summary>Verifies that DeadlineElapsed marks the current deployment as timed out.</summary>
     [Fact]
     public void DeadlineElapsed_for_current_deployment_marks_TimedOut()
     {
@@ -48,6 +49,7 @@ public sealed class ConfigPublishCoordinatorTimeoutTests : ControlPlaneActorTest
         }, duration: TimeSpan.FromSeconds(3));
     }
 
+    /// <summary>Verifies that stale DeadlineElapsed for other deployments is ignored.</summary>
     [Fact]
     public void Stale_DeadlineElapsed_for_other_deployment_is_ignored()
     {
@@ -66,6 +68,7 @@ public sealed class ConfigPublishCoordinatorTimeoutTests : ControlPlaneActorTest
         status.ShouldNotBe(DeploymentStatus.TimedOut);
     }
 
+    /// <summary>Verifies that PreStart recovers in-flight deployment state.</summary>
     [Fact]
     public void PreStart_recovers_inflight_deployment_state()
     {