wsen-pads: Add two-point temperature calibration.

[nedseb]

Summary

• Add set_temp_offset() and calibrate_temperature() methods to WSEN-PADS driver
• Apply calibration (gain + offset) in temperature() and read() methods
• Add mock test scenarios for offset and two-point calibration
• Improve existing mock tests with precise expected values

Closes #106

Test plan

Mock tests (CI)

python3 -m pytest tests/ -k "wsen-pads and mock" -v

Hardware tests (STeaMi board)

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

• ruff check passes
• All mock tests pass (8 tests including 3 new calibration tests)
• Hardware validation on STeaMi board

Test results

$python3 -m pytest tests/ --port /dev/ttyACM0 -k "wsen-pads 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 / 155 deselected / 7 selected                                                                                  

tests/test_scenarios.py::test_scenario[board_i2c_scan/WSEN-PADS device ID (0x5D)/hardware] 0xB3
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Verify device ID register/hardware] 0xB3
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Read device ID via method/hardware] 0xB3
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Read status register/hardware] 0
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Pressure in plausible range/hardware] 982.31
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Temperature in plausible range/hardware] 25.11
PASSED
tests/test_scenarios.py::test_scenario[wsen-pads/Pressure and temperature feel correct/hardware]   Pressure: 982.27 hPa
  Temperature: 25.13 °C
  [MANUAL] Ces valeurs sont-elles cohérentes (pression ~1013 hPa, température ambiante) ? [Entree=oui / Echap=non] 
PASSED

================================================ 7 passed, 155 deselected in 41.61s ================================================

[Copilot]

Pull request overview

Adds a harmonized two-point temperature calibration API to the WSEN-PADS driver and updates mock scenarios to validate calibrated temperature outputs, aligning with the calibration approach used in other drivers.

Changes:

• Introduces _temp_gain/_temp_offset state plus set_temp_offset() and calibrate_temperature() in WSEN_PADS.
• Applies gain/offset calibration in both temperature() and the temperature value returned by read().
• Tightens mock expectations and adds new mock calibration scenarios.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
lib/wsen-pads/wsen_pads/device.py	Adds calibration state + APIs; applies calibration in temperature() and read().
tests/scenarios/wsen_pads.yaml	Updates mock expectations and adds scenarios for offset and two-point calibration.

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[nedseb]

Addressed Copilot review:

• Replaced expect: 25.0 with expect_range: [24.9, 25.1] to avoid float equality brittleness
• Added mock test for read() to verify temperature calibration is applied in both temperature() and read()

[semantic-release-updater]

🎉 This PR is included in version 0.0.2 🎉

The release is available on GitHub release

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