Meshtastic DMs were falling back to a channel broadcast, so every node
on the LoRa channel saw a "direct" message. Send a directed MeshPacket
(to = node num, decoded from the synthetic pubkey's node-id bytes)
instead — the Meshtastic analog of the meshcore CMD_SEND_TXT_MSG fix.
DMs now reach only the recipient; firmware auto-PKC-encrypts them
end-to-end once NodeInfo keys are exchanged.
Capture E2E status at the driver level (no shared-type/UI change):
- learn each peer's real Curve25519 key from User.public_key (field 8)
and inbound MeshPacket.public_key (16), kept in a side-map separate
from the synthetic routing key so unicast routing is untouched
- detect inbound MeshPacket.pki_encrypted (17) to tell a true E2E DM
from a channel-PSK fallback
- peer_is_pkc_capable() seam for a future mesh-tab E2E badge
Hot-swap preserved: no dispatched MeshRadioDevice signature or the
shared ParsedContact changed, so meshcore and meshtastic stay
interchangeable behind the listener.
Adds tests/multinode/meshtastic.sh, a two/three-radio on-air parity
harness (detect, discover, DM round-trip, DM privacy, channel
broadcast, typed envelope, reachability).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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