remove debug/trace logging and clean up log files

Robovoice.App/MainForm.cs

@@ -531,33 +531,11 @@ internal sealed partial class MainForm : Form
 
     // ─── Shutdown ──────────────────────────────────────────────────────────
 
-    private static string DisposeLogPath => Path.Combine(AppConfig.AppDataDir, "dispose.log");
-
-    private static void LogDispose(string label, long elapsedMs)
-    {
-        string line = $"[{DateTime.Now:HH:mm:ss.fff}] {label}: {elapsedMs}ms";
-        try
-        {
-            Directory.CreateDirectory(AppConfig.AppDataDir);
-            File.AppendAllText(DisposeLogPath, line + "\n");
-        }
-        catch { }
-    }
-
     private void OnFormClosing(object? sender, FormClosingEventArgs e)
     {
-        var sw = Stopwatch.StartNew();
         _pttHotkey?.Dispose();
-        LogDispose("pttHotkey.Dispose", sw.ElapsedMilliseconds);
-
         _trayIcon!.Visible = false;
-
-        sw.Restart();
         ReleaseModel();
-        LogDispose("ReleaseModel", sw.ElapsedMilliseconds);
-
-        sw.Restart();
         SaveConfig();
-        LogDispose("SaveConfig", sw.ElapsedMilliseconds);
     }
 }