hts221: Add two-point temperature calibration.

[nedseb]

Summary

• Add set_temp_offset() and calibrate_temperature() methods for two-point calibration (gain + offset)
• Rename internal calibrate_temperature() / calibrate_humidity() to _read_temperature_calibration() / _read_humidity_calibration() to free the public name for user calibration
• Apply calibration in both temperature() and read()
• Add 3 mock test scenarios for offset, two-point calibration, and read() calibration

Closes #104

Test plan

Mock tests (CI)

python3 -m pytest tests/ -k "hts221 and mock" -v

Hardware tests (STeaMi board)

python3 -m pytest tests/ --port /dev/ttyACM0 -k "hts221 and hardware" -s -v

• ruff check passes
• All mock tests pass (11 tests including 3 new calibration tests)
• Hardware validation on STeaMi board

Test results

$python3 -m pytest tests/ --port /dev/ttyACM0 -k "hts221 and hardware" -s -v

======================================================= test session starts ========================================================
platform linux -- Python 3.13.7, pytest-8.3.5, pluggy-1.5.0 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /home/nedjar/sandbox/micropython-steami-lib
configfile: pytest.ini
plugins: typeguard-4.4.2
collected 162 items / 154 deselected / 8 selected                                                                                  

tests/test_scenarios.py::test_scenario[board_i2c_scan/HTS221/WSEN-HIDS device ID (0x5F)/hardware] 0xBC
PASSED
tests/test_scenarios.py::test_scenario[hts221/Verify device ID/hardware] 0xBC
PASSED
tests/test_scenarios.py::test_scenario[hts221/Read WHO_AM_I via method/hardware] 0xBC
PASSED
tests/test_scenarios.py::test_scenario[hts221/Temperature in plausible range/hardware] 24.09
PASSED
tests/test_scenarios.py::test_scenario[hts221/Humidity in plausible range/hardware] 65.43
PASSED
tests/test_scenarios.py::test_scenario[hts221/Status register has data ready/hardware] 3
PASSED
tests/test_scenarios.py::test_scenario[hts221/Auto-trigger after poweroff/hardware] PASSED
tests/test_scenarios.py::test_scenario[hts221/Temperature feels correct/hardware]   Temperature: 24.35 °C
  Humidity: 64.54 %
  [MANUAL] Ces valeurs sont-elles cohérentes avec l'ambiance ? [Entree=oui / Echap=non] 
PASSED

================================================ 8 passed, 154 deselected in 19.08s ================================================

[Copilot]

Pull request overview

Adds two-point temperature calibration support to the HTS221 driver, consistent with the harmonized calibration interface used by other drivers (WSEN-PADS, WSEN-HIDS, LIS2MDL).

Changes:

• Renamed internal factory calibration methods to _read_temperature_calibration()/_read_humidity_calibration() and added public set_temp_offset() and calibrate_temperature() methods
• Applied _temp_gain/_temp_offset calibration in both temperature() and read()
• Added 3 mock test scenarios for the new calibration features

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/hts221/hts221/device.py	Renamed internal calibration methods, added gain/offset fields and public calibration API
tests/scenarios/hts221.yaml	Added mock test scenarios for offset, two-point calibration, and read() calibration

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