Test policy firewall ownership across Docker modes - #3
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Add an opt-in isolated-root-VM integration test that rejects pre-existing policy state or a nonempty Docker host, applies/reapplies/removes only the policy-owned nftables table, and verifies Docker-owned firewall rules remain byte-for-byte unchanged. Ran against Ubuntu 26.04.1 / Docker 29.8 in native nftables, iptables-nft, and iptables-legacy modes. No runtime enforcement code changes; a full multi-host traffic/upgrade gate is separate.