Meshtastic device rename was a no-op — set_advert_name only updated an
in-memory field and never told the radio, so the device kept its firmware
default ('Meshtastic xxxx') and wasn't findable from external Meshtastic
apps. MeshCore already renamed correctly (CMD_SET_ADVERT_NAME); this brings
Meshtastic to parity.
Send an AdminMessage{set_owner=User{long_name,short_name}} to the locally
connected node (admin packet to our own node_num on the ADMIN_APP port).
Local serial admin needs no session passkey, matching the official client.
long_name = server name (<=39 chars); short_name = first 4 alphanumerics,
upper-cased. Verified on real hardware: .120 -> 'Archy-X250-EXP', .5 ->
'Archy-X250-Beta' (name read back from the radio after reconnect).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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