Follow-up: Exercise GitHub Actions changes from PR #4511

[justin808]

Source PR: #4511

Changed workflow/action files:

• .github/workflows/ci-required.yml
• script/ci-required-merge-group-gate
• script/ci_required_merge_group_gate_test.rb
• .github/workflows/hosted-ci-safety.test.cjs
• internal/contributor-info/ci-optimization.md

Post-merge exercise:
Use the first eligible merge_group or a temporary verification PR that changes package JS or CI-gate surface. Confirm ci-required / required-pr-gate waits for JS unit tests for Renderer package / build (20) on the merge-group SHA before passing. Also confirm mirrored-block drift fails ci-required.

Expected evidence:
Link the merge_group or verification PR run showing required-gate polling and the package JS minimum check result. For mirror lint, include a failing verification run or safe local replay evidence.

Cleanup:
Close/delete any verification-only PR or branch and remove temporary drift commits.

Owner: unknown

[justin808]

Post-merge exercise evidence

No verification PR was needed. PR #4513 supplied an eligible real merge_group run after #4511 merged.

Merge-group package JS gate

Merge-group SHA: b45374e0ccdd265bf60641c6bae354c4c9fb9b74

• JS unit tests for Renderer package / build (20) completed successfully at 2026-07-11T04:55:47Z.
• ci-required / required-pr-gate started its merge-group enforcement step at 04:54:09Z, reported build (20) as in_progress at 04:54:10Z, 04:54:31Z, 04:54:53Z, 04:55:14Z, and 04:55:35Z, then reported Required merge-group check(s) passed at 04:55:56Z.
• The required gate completed successfully at 2026-07-11T04:55:59Z, after the package JS minimum job completed.

This confirms the required gate waits for the package JS minimum check on the same merge-group SHA rather than passing early.

Mirrored-block gate

• The real merge-group check-mirrored-blocks job passed on the same SHA.
• Safe local replay on current origin/main (21212619c1dda3f7a89ac2e37ac6067a92b1e1d9):
  • bash script/lint-mirrored-blocks-test.bash -> 5 run, 0 failed; the suite includes genuine-drift fixtures that require a nonzero linter result.
  • ruby bin/lint-mirrored-blocks -> clean; checked 2 mirrored markers and 10 value-mirrored markers.

Cleanup: not applicable; no temporary PR, branch, or drift commit was created.

Final state: no-pr-evidence. The post-merge exercise and replay requirements are satisfied.

Lane Card

• Thread: ror-4512-closeout
• Lane: pr-lane / issue-4512-merge-group-exercise
• Target: Follow-up: Exercise GitHub Actions changes from PR #4511 #4512
• Branch: no-pr/4512-merge-group-exercise
• Phase: final
• Claim: codex-react-on-rails-4512-lane / 20260711T4512-closeout
• Coordinator: codex-react-on-rails-4512-lane

[justin808]

Closed as no-pr-evidence: the actual PR #4513 merge-group run proved the required gate waited for build (20), and the current-main mirror-drift harness supplied the accepted safe local failure replay. Evidence: #4512 (comment)