Captures the v3 design: IPAddressDeny= alone (no IPAddressAllow=any
because the documented "more specific wins" semantics don't hold on
systemd 257 / kernel 6.12 — the allow trumps unconditionally), explicit
CIDRs (the -p parser rejects the localhost/link-local shorthand
keywords), and a static sandbox-only resolv.conf bind to keep DNS
reachable when private RFC1918 ranges are blocked.
Plan documents what was implemented (in
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