docs(#1977): drop exposeHostPorts proxy history from network.md
Trim the historical parenthetical about the dropped systemd-socket-proxyd
forwarder — argus flagged it (🟡 on the merged PR) and the constraint
(bind 0.0.0.0 or the bridge IP, not loopback) stands on its own without
the "why we dropped the proxy" narrative. No-history-in-docs preference.
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@ -171,10 +171,7 @@ This is **firewall-only**: the host service must bind an address
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reachable from the bridge — `0.0.0.0` or the bridge IP — not loopback
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only. The bridge→`127.0.0.0/8` DROP rule (below) is unchanged, so a
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service bound to `127.0.0.1` only stays unreachable; rebind it to
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`0.0.0.0`. (An earlier revision shipped a per-port
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`systemd-socket-proxyd` bridge→loopback forwarder, but that collides
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EADDRINUSE with any collector already bound to `0.0.0.0` — which is the
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common case — so the proxy was dropped in favour of opening the port.)
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`0.0.0.0`.
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The port is reachable by **every** agent on the bridge subnet (like
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DNS/gateway), so only expose services safe for any agent to reach.
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