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.OpcUaClient.Tests/OpcUaClientDriverScaffoldTests.cs

@@ -12,6 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
 [Trait("Category", "Unit")]
 public sealed class OpcUaClientDriverScaffoldTests
 {
+    /// <summary>Verifies that default options target the standard OPC UA port with anonymous auth.</summary>
     [Fact]
     public void Default_options_target_standard_opcua_port_and_anonymous_auth()
     {
@@ -23,6 +24,7 @@ public sealed class OpcUaClientDriverScaffoldTests
         opts.AutoAcceptCertificates.ShouldBeFalse("production default must reject untrusted server certs");
     }
 
+    /// <summary>Verifies that default timeouts match driver specification section 8.</summary>
     [Fact]
     public void Default_timeouts_match_driver_specs_section_8()
     {
@@ -32,6 +34,7 @@ public sealed class OpcUaClientDriverScaffoldTests
         opts.ReconnectPeriod.ShouldBe(TimeSpan.FromSeconds(5));
     }
 
+    /// <summary>Verifies that driver reports type and ID before connecting.</summary>
     [Fact]
     public void Driver_reports_type_and_id_before_connect()
     {
@@ -41,6 +44,7 @@ public sealed class OpcUaClientDriverScaffoldTests
         drv.GetHealth().State.ShouldBe(DriverState.Unknown);
     }
 
+    /// <summary>Verifies that Initialize against unreachable endpoint transitions to Faulted and throws.</summary>
     [Fact]
     public async Task Initialize_against_unreachable_endpoint_transitions_to_Faulted_and_throws()
     {
@@ -67,6 +71,7 @@ public sealed class OpcUaClientDriverScaffoldTests
         health.LastError.ShouldNotBeNull();
     }
 
+    /// <summary>Verifies that Reinitialize against unreachable endpoint re-throws the error.</summary>
     [Fact]
     public async Task Reinitialize_against_unreachable_endpoint_re_throws()
     {