ism330dl: Add two-point temperature calibration methods.

[nedseb]

Closes #107

Summary

Add temperature calibration methods to the ISM330DL driver, consistent with the harmonized interface from #103:

• set_temp_offset(offset_c) — simple offset correction (gain=1.0)
• calibrate_temperature(ref_low, measured_low, ref_high, measured_high) — two-point gain+offset calibration
• _temp_gain and _temp_offset initialized in __init__
• temperature_c() applies calibration: gain * factory + offset

Test plan

python3 -m pytest tests/ -k "ism330dl and mock" -v

3 new mock tests (24 total):

• Temperature offset shifts reading
• Temperature with two-point calibration
• Calibration rejects equal measurements

Test results

python3 -m pytest tests/ -k "ism330dl and hardware" -v --port /dev/ttyACM0 -s

======================================================= 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 199 items / 191 deselected / 8 selected                                                                                  

tests/test_scenarios.py::test_scenario[board_i2c_scan/ISM330DL WHO_AM_I (0x6B)/hardware] 0x6A
PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Verify WHO_AM_I register/hardware] 0x6A
PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Read WHO_AM_I via method/hardware] 0x6A
PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Status returns dictionary/hardware] {'accel_ready': True, 'temp_ready': True, 'gyro_ready': True}
PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Acceleration magnitude near 1g/hardware] PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Gyroscope values plausible at rest/hardware] PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Temperature in plausible range/hardware] 24.17
PASSED
tests/test_scenarios.py::test_scenario[ism330dl/Sensor readings feel correct/hardware]   Acceleration (g): [-0.397171, 0.23973, -0.862296] 
  Gyroscope (dps): [-0.04375, -3.21125, 0.00875] 
  Temperature: 24.27 °C
  Orientation: SCREEN_UP 
  [MANUAL] Les valeurs d'accélération, rotation, température et orientation sont-elles cohérentes ? [Entree=oui / Echap=non] 
PASSED

================================================ 8 passed, 191 deselected in 51.01s ================================================

[Copilot]

Pull request overview

This PR adds a harmonized two-point temperature calibration interface to the ISM330DL MicroPython driver (per #103 / #107), and validates it via new mock scenario tests.

Changes:

• Initialize temperature calibration state (_temp_gain, _temp_offset) in ISM330DL.__init__().
• Apply calibration in temperature_c() and add set_temp_offset() + calibrate_temperature() APIs.
• Add mock scenario coverage for offset calibration, two-point calibration, and invalid calibration inputs.

Reviewed changes

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

File	Description
lib/ism330dl/ism330dl/device.py	Adds calibration state + public calibration methods; applies gain/offset to computed factory temperature.
tests/scenarios/ism330dl.yaml	Adds mock scenario tests covering offset behavior, two-point calibration result, and ValueError on invalid delta.

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