fix(scripting): explicit companion logger + disposable ScriptRootLogger (T2 review)

src/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting/ScriptRootLogger.cs

@@ -11,15 +11,23 @@ namespace ZB.MOM.WW.OtOpcUa.Core.Scripting;
 ///     file sink, the <see cref="ScriptLogCompanionSink"/> mirroring errors to the main log,
 ///     and the <see cref="ScriptLogTopicSink"/> fanning entries onto the cluster
 ///     <c>script-logs</c> topic for the live Script-log Admin UI page.
+///     <para>
+///         Implements <see cref="IDisposable"/> so the DI container flushes the rolling-file
+///         sink on graceful host shutdown.
+///     </para>
 /// </remarks>
-public sealed class ScriptRootLogger
+public sealed class ScriptRootLogger : IDisposable
 {
-    /// <summary>Gets the composed root script logger that evaluators derive per-script loggers from.</summary>
-    public Serilog.ILogger Logger { get; }
+    private readonly Serilog.Core.Logger _logger;
 
-    /// <summary>Initializes a new instance of the <see cref="ScriptRootLogger"/> class.</summary>
-    /// <param name="logger">The composed root script logger. Must not be <c>null</c>.</param>
-    /// <exception cref="ArgumentNullException">Thrown when <paramref name="logger"/> is <c>null</c>.</exception>
-    public ScriptRootLogger(Serilog.ILogger logger) =>
-        Logger = logger ?? throw new ArgumentNullException(nameof(logger));
+    /// <summary>The composed root script logger (file + companion mirror + DPS topic sink).</summary>
+    public Serilog.ILogger Logger => _logger;
+
+    /// <summary>Initializes a new <see cref="ScriptRootLogger"/>.</summary>
+    /// <param name="logger">The composed Serilog logger; owned + disposed by this wrapper.</param>
+    public ScriptRootLogger(Serilog.Core.Logger logger) =>
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+
+    /// <summary>Disposes the underlying logger, flushing the rolling-file sink.</summary>
+    public void Dispose() => _logger.Dispose();
 }