ensure_lora_region previously force-overrode the device's region with the
mesh-config region (EU_868) whenever they differed — which would shove a US/ANZ
user's radio onto EU_868: an illegal band that also cuts it off from its local
mesh. Off-the-shelf interop must respect whatever region the user flashed.
Now: a radio that already reports a REAL region (US, EU_868, ANZ, …) is left
untouched. We only set a region when the device reports UNSET (a fresh radio is
RF-silent and can't mesh at all), using the operator-configured region as the
fallback. Unknown/None (never reported) is also left alone. Pairs with the
default-channel change so a meshtastic archy node behaves like a stock device.
cargo check green (built into the same binary as the channel fix).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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