Adds an additive, loopback-only TCP server/client interface to
reticulum-daemon and the Rust mesh wiring, alongside the unchanged serial
RNode path. Aurora (~/aurora) already speaks standard RNS/LXMF over plain
TCP by default, the same way Sideband already proved interop over LoRa
(docs/RETICULUM-TRANSPORT-PROGRESS.md gates #2/#3) — this closes the gap so
that interop is provable without scarce LoRa hardware, and gives archy a
path to eventually be dialed by an Aurora client.
Verified: daemon TCP transport round-trip, bidirectional LXMF DM against a
scripted RNS/LXMF stand-in for Aurora's Dart stack (content + dest-hash
match both directions), cargo check/test -p archipelago green (108 mesh
tests, 0 regressions), and a real MeshService::start() end-to-end test
spawning the daemon in TCP client mode with no serial probe.
TCP server mode is hard-gated to loopback in both Python and Rust — WAN/LAN
exposure is a deliberate future decision, not part of this change.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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