Fix 5 bugs in BME280.py verified against Bosch BME280_SensorAPI and Adafruit references

1. get_power_mode() missing parentheses in set_oversamp_pressure and
   set_oversamp_temperature — compared method object instead of calling it,
   so sleep-mode check never worked correctly.

2. set_oversamp_humidity else branch wrote ctrl_hum_reg into CTRL_MEAS
   register instead of ctrl_meas_reg (per datasheet §5.4.3, humidity
   settings require a subsequent write to ctrl_meas with the correct value).

3. dig_H6 stored as unsigned byte — should be int8_t per Bosch
   bme280_defs.h and Adafruit_BME280.h.

4. dig_H4/H5 sign extension wrong — used to_s16() on 12-bit signed values.
   Now sign-extends from MSB byte first (to_s8) then combines with LSB
   nibble, matching Bosch parse_humidity_calib_data() and Adafruit
   readCoefficients().

5. Humidity compensation formula was missing var5 multiplication factor
   vs Bosch compensate_humidity() (BME280_DOUBLE_ENABLE path). Rewritten
   with Bosch variable names for easy cross-referencing.

0 files changed, 0 insertions, 0 deletions