simple_repeater::onPeerDataRecv and simple_room_server::onPeerDataRecv
both open their TXT_MSG branch by rejecting any flags outside
{PLAIN, CLI_DATA, CLI_COMMAND}. openHop had no such gate: it decided what
a message was purely from whether the text looked like a command, so a
SIGNED_PLAIN -- a room post, whose 4-byte author prefix the core handler
has already stripped, leaving bare text -- ran as an admin CLI command
whenever it happened to start with a command prefix, and was stored as a
post on a room server that firmware would have dropped.
CLI_COMMAND (3) joined the accepted set when firmware split "a CLI
command" out of CLI_DATA (MeshCore 2c0ace25); CLI_DATA stays in it
because that is what every released client still sends.
Reads the type from packet.decrypted, which the core text handler now
publishes. A core too old to report it leaves the gate open rather than
dropping every message.