Confirm required-title-prefix is already in use for improver workflow PR-branch pushes

[Copilot]

gh aw compile --strict deprecates title-prefix under safe-outputs.push-to-pull-request-branch. This PR verifies the three targeted improver workflows are already using the replacement key (required-title-prefix) with the intended PR-title filter semantics.

• Scope reviewed

  • workflows/efficiency-improver.md
  • workflows/perf-improver.md
  • workflows/test-improver.md

• Configuration outcome

  • push-to-pull-request-branch in all three workflows already uses required-title-prefix.
  • No behavior change is introduced; title-prefix gating remains the same.

• Representative config

  safe-outputs:
    push-to-pull-request-branch:
      target: "*"
      required-title-prefix: "[perf-improver] "
      max: 4