lis2mdl: Add temperature offset correction with calibration method.

[nedseb]

Closes #97

Summary

• Add LIS2MDL_TEMP_SENSITIVITY (8 LSB/°C) and LIS2MDL_TEMP_OFFSET (25°C) constants in const.py
• Apply offset correction in read_temperature_c(): offset + raw / sensitivity instead of raw / 8.0
• Add set_temp_offset(offset) method for runtime calibration
• Update mock test registers (TEMP_OUT=0 → 25°C with offset)
• Tighten hardware temperature test range to [10, 45]°C

Context

The LIS2MDL datasheet specifies 8 LSB/°C sensitivity but does not guarantee the absolute temperature offset. Hardware tests showed ~5.75°C at room temperature (~22°C), confirming the need for an offset correction.

The default offset of 25°C is an empirical starting point. The set_temp_offset() method allows per-board calibration — we plan to refine the default after testing ~100 STeaMi boards.

Test plan

• ruff check passes
• pytest tests/ -k "lis2mdl and mock" -v — 6/6 passed
• pytest tests/ -k mock -v — 44/44 passed (no regressions)
• Hardware test: pytest tests/ --port /dev/ttyACM0 -s -k lis2mdl

[Copilot]

Pull request overview

Adds temperature offset correction and calibration support to the LIS2MDL driver so temperature readings can be adjusted for the datasheet’s unspecified absolute offset (issue #97).

Changes:

• Introduces LIS2MDL_TEMP_SENSITIVITY and LIS2MDL_TEMP_OFFSET constants and applies offset + raw/sensitivity conversion.
• Adds runtime calibration via set_temp_offset().
• Updates LIS2MDL scenario mock temperature registers and tightens the hardware plausible-range check.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
lib/lis2mdl/lis2mdl/const.py	Adds temperature conversion constants used by the driver.
lib/lis2mdl/lis2mdl/device.py	Applies offset-based temperature conversion and adds a calibration setter.
tests/scenarios/lis2mdl.yaml	Updates mock TEMP_OUT values and tightens hardware temperature range.

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[nedseb]

Suggestions Copilot prises en compte dans le commit 9c7d83d :

1. const() wrapper sur LIS2MDL_TEMP_SENSITIVITY et LIS2MDL_TEMP_OFFSET — déjà appliqué (commit 6aa75d0).
2. Docstring read_temperature_c() — enrichie : mention du datasheet Table 4, offset empirique, référence au PR Zephyr #35912.
3. set_temp_offset() — paramètre renommé offset_c, coercion float(), docstring avec Args.
4. Test mock température — expect_not_none remplacé par expect: 25.0 (valeur exacte vérifiable avec raw=0).

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