Follow-up: Exercise GitHub Actions changes from PR #5053

[justin808]

Source change

• Source PR: Fix docs-only CI guard after descendant workflow success #5053
• Semantic action files:
  • .github/actions/ensure-main-docs-safety/check-previous-main.cjs
  • .github/actions/ensure-main-docs-safety/check-previous-main.test.cjs

Post-merge exercise

After #5053 merges, use the next ordinary docs-only PR that targets a current main containing #5053. Merge that PR through the normal repository process so its merge commit produces the real push event on main used by the guarded workflows.

Verify the detect-changes job in each selected hosted workflow invokes Ensure main docs-only skips are safe without an API-shape failure. When first-parent history contains a newer trusted success for the same workflow as an older failure, verify the log reports that the older failure was superseded. Otherwise, verify the unchanged normal docs-only decision and retain the focused unit replay from #5053 as coverage for the supersession branch.

Expected evidence

• Link to the docs-only PR and its merge commit.
• Links to the push workflow runs on that exact merge commit.
• The exact Fix docs-only CI guard after descendant workflow success #5053 merge commit SHA that the verification PR contains.
• Guard log excerpts or an artifact showing the decision path.
• Confirmation that no unrelated workflow failure was suppressed.

Cleanup

Use an ordinary valuable docs-only change when available, so no verification-only branch or PR needs cleanup. If a temporary verification PR is created instead, close it and delete its branch if the exercise stops before merge. Do not merge a content-free or throwaway docs change solely for this exercise.

Owner

justin808