MeshService::injectAsReceived (gated by MESHTASTIC_ENABLE_FRAME_INJECTION, off by default) extends
the portduino SimRadio SIMULATOR_APP path to real hardware: a client-supplied frame, wrapped in a
Compressed envelope on the SIMULATOR_APP portnum, is delivered through the real receive pipeline
(router->enqueueReceivedMessage) as if it arrived off the LoRa chip. It therefore exercises from!=0
enforcement, channel/PKC decryption, remote-admin authorization, and hop/dedup/module dispatch -
paths the toRadio API cannot reach (it forces from=0). from==0 is dropped to match real RX.
This forges over-the-air traffic, so the flag must never ship enabled. Drive it with the
meshtastic-mcp inject_frame tool / cli/meshinject.py. Documents the technique in the agent-facing
copilot-instructions.md + AGENTS.md.
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