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997a6bb79a
An older remote node ignores the forwarded actor-role header (running proxied requests as admin) and ignores the stop-by-label stack allowlist (stopping every label-matched stack). The control could neither detect nor prevent this on a mixed-version fleet. Instances now advertise a cross-node-rbac capability, and the control refuses to act when a remote lacks it: - HTTP proxy: a non-admin user's request is not forwarded to a remote that does not advertise the capability (fails closed when it cannot be determined). Admins are unaffected. - Stop-by-label: a real stop bound to a confirmed stack set is not sent to a remote lacking the capability; the node is reported as needing an upgrade. As defense in depth, a node whose results name stacks outside the confirmed set is failed rather than rendered as a clean stop. Separately, the stop's lock-contention path now reports every confirmed stack as a contention failure (including one that lost its label), so a confirmed stack is never silently dropped and the result is never empty.