Function runner 

pub async fn runner<RK, DLY, M, const RX: usize, const TX: usize>(
    lora: LoRa<RK, DLY>,
    ch: &'static Channels<M, RX, TX>,
    mdltn: ModulationParams,
    rx_pkt: PacketParams,
    tx_pkt: PacketParams,
    power_dbm: i32,
) -> !
where
    RK: RadioKind,
    DLY: DelayNs,
    M: RawMutex,

Background loop: owns the lora_phy::LoRa instance, switches between continuous RX and TX as requests arrive. Never returns.

Wrap this in a #[embassy_executor::task] in the binary crate so the concrete monomorphisation is visible to the linker.

Cancellation safety

wait_for_irq is the only await point that may be cancelled (it just awaits a DIO edge and is safe to drop). process_irq_event, prepare_for_tx, and tx all run to completion outside any select branch — cancelling those leaves the radio in a wedged state from which prepare_for_tx will hang forever (lora-phy explicitly warns against dropping process_irq_event futures). The convenience lora.rx() helper internally calls complete_rx/process_irq_event, so it is not safe inside a select either; we hand-roll the IRQ loop here to keep cancellation pinned to wait_for_irq.