ci: stub required-status-check workflows - #139

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Closing as obsolete. Two independent reasons, and the second is the important one.

1. The gap it was written to fill no longer exists.

This PR was opened on 2026-05-10 to make the required context Dependency & Standards Validation report at all. It already does. A current PR in this repository (#155) shows that context reporting SUCCESS from existing workflows on main, without this file. Merging this would add a third emitter of a context that already has working ones.

2. The job it adds enforces nothing.

The entire job body is:

  dep-standards:
    name: Dependency & Standards Validation
    runs-on: ubuntu-latest
    steps:
      - name: Placeholder
        run: echo "stub"

A required status check whose implementation is echo "stub" cannot fail, so it reports green regardless of the state of the dependencies or standards it claims to validate. That is worse than a missing check: a missing check blocks loudly and gets fixed, while an always-green check looks like coverage and quietly provides none. Anyone reading the branch protection list would reasonably conclude this repository validates dependencies on every PR.

For the record on the mechanics: because GitHub requires every check run sharing a context name to pass, this stub would not actually weaken the existing real gate. So the harm here is not a bypass, it is the misleading signal and the extra always-green run.

What actually blocked this repository, for the record. The real cause of the required checks not reporting was that GitHub had auto-disabled 39 workflows across seven repositories for repository inactivity, including security-analysis.yml, the sole emitter of Security Gate Validation. A disabled workflow never runs and so never reports, which leaves a PR BLOCKED with a fully green check list and nothing in the rollup to explain it. Those workflows have now been re-enabled and re-triggered, which is the fix this PR was reaching for.

The branch ci/stub-required-checks is not deleted, so nothing is lost.