[ElliotEtag]

• Promotes fix: pin Sites workflow to its merged commit #7: updates the shared workflow pin and README link to merged commit 75c8b4c4c409ce6537b8fb73c054c0155617a7f9.
• The complete production diff is these two reference replacements; the workflow contents match the reviewed version exactly.
• Source CI, actionlint and diff checks pass. The first deployment started no jobs; this promotion retries the shared production deployment.