fix(ui): close the pseudo console when a conpty tile is disposed

src/ClaudeDo.Ui/Services/PtyTerminalSession.cs

@@ -192,12 +192,24 @@ public sealed class PtyTerminalSession : IDisposable
         return (Task)s_sendToPty.Invoke(view, new object[] { data, CancellationToken.None })!;
     }
 
+    /// <summary>Kills the child and closes its pseudo console; falls back to a plain kill if the private seam is gone.</summary>
     public void Kill()
     {
-        try { _control?.Kill(); }
+        try
+        {
+            // TerminalControl.Kill() leaves the pseudo console open (one orphaned conhost.exe per tile);
+            // only the private CleanupProcess disposes it, and BeginReparent suppressed its detach-time call.
+            if (_control is { } control && s_terminalViewField?.GetValue(control) is TerminalView view && s_cleanupProcess is not null)
+                s_cleanupProcess.Invoke(view, null);
+            else
+                _control?.Kill();
+        }
         catch (Exception) { /* already exited */ }
     }
 
+    private static readonly MethodInfo? s_cleanupProcess =
+        typeof(TerminalView).GetMethod("CleanupProcess", BindingFlags.Instance | BindingFlags.NonPublic);
+
     public void Dispose()
     {
         if (_disposed) return;