PR follow-up live acceptance

Workflow runs for PR follow-up live acceptance

• fix: repair isolated Sum regression after real PR follow-up

  completed successfully:
  PR follow-up live acceptance#2:Commit8edaf09pushedbyQiyuanqiii
  Qiyuanqiii/pr-followup-live-head-20261018025549

  Oct 18, 202617s
  More actions for workflow run 2

• test: introduce isolated Sum regression for live repair

  failed:
  PR follow-up live acceptance#1:Commit690ba40pushedbyQiyuanqiii
  Qiyuanqiii/pr-followup-live-head-20261018025549

  Oct 18, 202622s
  More actions for workflow run 1