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.

src/Server/ZB.MOM.WW.OtOpcUa.Host/OpcUa/LdapOpcUaUserAuthenticator.cs

@@ -16,6 +16,10 @@ public sealed class LdapOpcUaUserAuthenticator(
     ILogger<LdapOpcUaUserAuthenticator> logger)
     : IOpcUaUserAuthenticator
 {
+    /// <summary>Authenticates an OPC UA UserName token via LDAP.</summary>
+    /// <param name="username">The username to authenticate.</param>
+    /// <param name="password">The password to authenticate.</param>
+    /// <param name="ct">Cancellation token.</param>
     public async Task<OpcUaUserAuthResult> AuthenticateUserNameAsync(string username, string password, CancellationToken ct)
     {
         try

src/Server/ZB.MOM.WW.OtOpcUa.Host/OpcUa/OtOpcUaServerHostedService.cs

@@ -30,6 +30,14 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
     private OpcUaApplicationHost? _appHost;
     private OtOpcUaSdkServer? _server;
 
+    /// <summary>
+    /// Initializes a new instance of the OtOpcUaServerHostedService class.
+    /// </summary>
+    /// <param name="configuration">The application configuration.</param>
+    /// <param name="deferredSink">The deferred address space sink that receives the real sink once the server is ready.</param>
+    /// <param name="deferredServiceLevel">The deferred service level publisher that receives the real publisher once the server is ready.</param>
+    /// <param name="userAuthenticator">The OPC UA user authenticator.</param>
+    /// <param name="loggerFactory">The logger factory for creating loggers.</param>
     public OtOpcUaServerHostedService(
         IConfiguration configuration,
         DeferredAddressSpaceSink deferredSink,
@@ -45,6 +53,10 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
         _logger = loggerFactory.CreateLogger<OtOpcUaServerHostedService>();
     }
 
+    /// <summary>
+    /// Starts the OPC UA server asynchronously.
+    /// </summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
     public async Task StartAsync(CancellationToken cancellationToken)
     {
         var options = new OpcUaApplicationHostOptions();
@@ -90,6 +102,10 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
         _logger.LogInformation("OtOpcUaServerHostedService: SDK started, address-space + ServiceLevel sinks bound");
     }
 
+    /// <summary>
+    /// Stops the OPC UA server asynchronously.
+    /// </summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
     public Task StopAsync(CancellationToken cancellationToken)
     {
         // Revert to Null adapters so any in-flight writes from a poison-pilled actor don't hit a
@@ -99,6 +115,9 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
         return Task.CompletedTask;
     }
 
+    /// <summary>
+    /// Disposes the hosted service and its resources asynchronously.
+    /// </summary>
     public async ValueTask DisposeAsync()
     {
         if (_appHost is not null) await _appHost.DisposeAsync();