test: drift-check clean probe

[joshua-temple]

Touches only a non-generated path so the drift gate must pass. Not for merge.

[github-actions]

Workflow drift detected

The generated workflows are out of sync with the manifest.

To fix, run and commit the result:

cascade generate-workflow --config .github/manifest.yaml --force

cascade verify output

~ .github/workflows/cascade-drift-check.yaml
~ .github/workflows/cascade-hotfix.yaml
~ .github/workflows/cascade-merge-queue.yaml
~ .github/workflows/cascade-rollback.yaml
~ .github/workflows/cascade-validate.yaml
~ .github/workflows/orchestrate.yaml
~ .github/workflows/promote.yaml

7 file(s) drifted. Run `cascade generate-workflow` and commit the result.
Error: workflow drift detected
workflow drift detected