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.IntegrationTests/OpcUaClientSmokeTests.cs

@@ -16,6 +16,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests;
 [Trait("Simulator", "opc-plc")]
 public sealed class OpcUaClientSmokeTests(OpcPlcFixture sim)
 {
+    /// <summary>Verifies that the client can connect and read a node through the real OPC UA stack.</summary>
     [Fact]
     public async Task Client_connects_and_reads_StepUp_node_through_real_OPC_UA_stack()
     {
@@ -33,6 +34,7 @@ public sealed class OpcUaClientSmokeTests(OpcPlcFixture sim)
         snapshots[0].Value.ShouldNotBeNull("StepUp always has a current value");
     }
 
+    /// <summary>Verifies that the client can read a batch of varied types from the simulator.</summary>
     [Fact]
     public async Task Client_reads_batch_of_varied_types_from_live_simulator()
     {
@@ -57,6 +59,7 @@ public sealed class OpcUaClientSmokeTests(OpcPlcFixture sim)
         snapshots[2].Value.ShouldBeOfType<bool>();
     }
 
+    /// <summary>Verifies that the client can subscribe to data changes from the live server.</summary>
     [Fact]
     public async Task Client_subscribe_receives_StepUp_data_changes_from_live_server()
     {