fix(acp): make xai cancellation reliable

Cancel pending prompt completions without restarting ACP, and keep text-only monitor acknowledgements tracked as background work.

Co-authored-by: codex <codex@users.noreply.github.com>
68876ad4faJulius Marminge committed on 8/29/2026, 6:01:51 AMparent387d170
2 files changedLine totals unavailable