Promote the Hub Resync From develop to main

[ptr727]

The hub resync (#127, #128, #129, #130, and #131) is on develop and not yet on main. Consumers pull latest from main, and the Docker Hub overview and short description publish only from main, so the resync's effect is incomplete until the promotion.

Promotion Notes

• Expected conflict: Dependabot updated .github/workflows/build-docker-task.yml, build-release-task.yml, get-version-task.yml, publish-docker-readme-task.yml, and validate-task.yml on main, and develop deletes them (Adopt the Hub Reusable Workflows and Retire repo-config #129). The promotion shows a modify/delete conflict on each. Resolve it by keeping the deletion, since the thin callers reach the hub's copies instead.
• After the merge: the next main publish, the weekly schedule or a dispatch, pushes the About text to Docker Hub as the short description. That clears the last audit finding.
• Cleanup: the five resync/* branches remain on the remote, since branch auto-delete is off. Delete them once the promotion lands.

Put Closes keywords for any develop-only issue in the promotion PR's description, since they fire only on a merge to main.