TC-L-05 — LORA_RESETn pin state and boot pulse

LORA_RESETn is driven by PI4IOE GPIO expander P10 (port 1, bit 0) via I2C.

1. Static check: Probe LORA_RESETn with a DMM while the device is powered and running (after boot completes). Must read 3.3 V (HIGH). If stuck LOW, the SX1276 is permanently held in reset — SPI still works with default register values, but all mode transitions fail.
2. Boot pulse: Trigger a reboot and observe LORA_RESETn on a scope. Expected waveform: pin goes LOW for ~1 ms, then returns HIGH and remains HIGH.

Pass: pin is HIGH during normal operation; LOW pulse observed during reset sequence with clean return to HIGH.