wsen-hids: Fix missing AUTO_INCREMENT bit in multi-byte register reads.

[nedseb]

Closes #109

Summary

• Fix _read_regs() to set AUTO_INCREMENT (bit 7) when reading more than 1 byte, as required by the WSEN-HIDS (HTS221-based) I2C protocol
• Remove redundant | AUTO_INCREMENT in _read_raw_humidity_temperature() (now handled centrally)
• Update mock register addresses to use auto-increment keys (0xB6, 0xBA, 0xBC, 0xBE)

Bug

Without the auto-increment bit, multi-byte reads return the same byte repeated. This corrupted all 16-bit calibration values (T0_OUT, T1_OUT, H0_T0_OUT, H1_T0_OUT), causing temperature to read ~6°C too low and humidity to be inaccurate.

Hardware validation

Before fix:

HTS221:    T=26.39 C
WSEN-HIDS: T=20.31 C  ← ~6°C too low
WSEN-PADS: T=25.86 C

After fix:

HTS221:    T=31.22 C
WSEN-HIDS: T=31.33 C  ← now matches HTS221
WSEN-PADS: T=29.88 C

Test plan

• ruff check passes
• pytest tests/ -k mock — 44/44 passed (no regressions)
• Hardware: temperature and humidity now match HTS221 within ~0.1°C

[Copilot]

Pull request overview

This PR fixes incorrect multi-byte I2C register reads in the wsen-hids driver by ensuring the sensor’s required AUTO_INCREMENT bit is applied whenever reading more than one byte, which restores correct calibration parsing and accurate temperature/humidity measurements.

Changes:

• Update WSEN_HIDS._read_regs() to OR in AUTO_INCREMENT for multi-byte reads.
• Remove redundant AUTO_INCREMENT OR-ing at the call site in _read_raw_humidity_temperature().
• Update the WSEN-HIDS mock scenario register map to use auto-incremented register keys for multi-byte calibration reads.

Reviewed changes

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

File	Description
lib/wsen-hids/wsen_hids/device.py	Centralizes AUTO_INCREMENT behavior in _read_regs() and simplifies raw read call sites.
tests/scenarios/wsen_hids.yaml	Adjusts mock register keys to validate the new multi-byte auto-increment behavior in mock tests.

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