Filter BMA456 logs by configurable LSB threshold; master can set deadzone
for local sensor or slaves using ACCEL_DEADZONE (UART) and ESP-NOW broadcast
until unicast delivery is restored.
Co-authored-by: Cursor <cursoragent@cursor.com>
Probe and configure the sensor when present; log and continue boot if
init fails so boards without BMA456 still run normally.
Co-authored-by: Cursor <cursoragent@cursor.com>
