The synthetic meshcore-style frame the meshtastic driver builds can't carry the
radio's PKI-encryption status, so received meshtastic DMs never lit the E2E pill.
Thread it out-of-band: the device records `last_rx_encrypted` (= packet
pki_encrypted) when it yields a text frame; the session loop reads it via
`take_rx_encrypted()` right after dispatch and stamps the just-stored received
message E2E (dispatch::stamp_received_encrypted, monotonic-id keyed). Meshcore
returns false here (its E2E is derived in the frames decrypt path). Pure
out-of-band signal — no change to the shared meshcore wire format.
Built + deployed live in binary d937814e on .116/.198. cargo check green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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