fix(acp): keep one answer when a running tool reports progress (#13386)

Co-authored-by: adeebahmad01 <52380344+adeebahmad01@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
e759847f93Julius Marminge committed on 9/24/2026, 8:20:28 PM· committed by GitHubparent53456bc
3 files changedLine totals unavailable