firmware: use verified sensor settings

tests/test_xiao_sensor_node_contract.py

@@ -30,19 +30,17 @@ def test_imu_does_not_redeclare_arduino_degrees_macro():
     assert "float degrees(" not in imu
     assert "radiansToDegrees" in imu
 
-def test_imu_scans_both_bno08x_i2c_addresses():
+def test_imu_uses_verified_i2c_address():
     config = source("sensor_node_config.h")
     imu = source("imu.cpp")
-    assert "BNO086_I2C_ADDRESS 0x4A" in config
-    assert "BNO086_I2C_ADDRESS_ALTERNATE 0x4B" in config
-    assert "findBnoAddress()" in imu
-    assert "Wire.endTransmission()" in imu
+    assert "BNO086_I2C_ADDRESS 0x4B" in config
+    assert "findBnoAddress" not in imu
 
-def test_gps_auto_detects_common_nmea_baud_rates():
+def test_gps_uses_verified_uart_baud():
+    config = source("sensor_node_config.h")
     gps = source("gps.cpp")
-    assert "baudHasValidNmea" in gps
-    assert "{9600, 38400, 115200, 4800}" in gps
-    assert "passedChecksum() > 0" in gps
+    assert "GPS_BAUD 38400" in config
+    assert "baudHasValidNmea" not in gps
 
 def test_level_calibration_is_persistent_and_non_blocking():
     calibration = source("calibration.cpp")