hts221: Auto-trigger one-shot conversion in power-down mode.

[nedseb]

Summary

Closes #44 (for HTS221).

• Add _is_power_down(), _is_one_shot_mode(), trigger_one_shot(), and _ensure_data() helpers
• temperature() and humidity() now auto-trigger a one-shot conversion when the sensor is in power-down or one-shot mode
• trigger_one_shot() uses read-modify-write on CTRL_REG2 to preserve HEATER/BOOT bits
• Add read() method that returns (humidity, temperature) with a single trigger (avoids double conversion)
• get() now delegates to read() for backward compatibility
• Add CTRL_REG1/CTRL_REG2/STATUS_REG bit constants to const.py
• Add hardware test: poweroff() then temperature() verifies auto-trigger works

Follows the same _ensure_data() pattern as WSEN-PADS and WSEN-HIDS.

Test plan

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

# Hardware tests (with board connected)
python3 -m pytest tests/ --port /dev/ttyACM0 -k "hts221 and hardware" -s -v

Mock test results

tests/test_scenarios.py::test_scenario[hts221/Verify device ID/mock] PASSED
tests/test_scenarios.py::test_scenario[hts221/Read WHO_AM_I via method/mock] PASSED
tests/test_scenarios.py::test_scenario[hts221/Read temperature returns float/mock] PASSED
tests/test_scenarios.py::test_scenario[hts221/Read humidity returns float/mock] PASSED
tests/test_scenarios.py::test_scenario[hts221/Status register has data ready/mock] PASSED
5 passed

Hardware test results

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] 29.44 PASSED
tests/test_scenarios.py::test_scenario[hts221/Humidity in plausible range/hardware] 37.63 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] True PASSED
tests/test_scenarios.py::test_scenario[hts221/Temperature feels correct/hardware]   Temperature: 29.26 °C
  Humidity: 38.03 %
  [MANUAL] Ces valeurs sont-elles cohérentes avec l'ambiance ? [Entree=oui / Echap=non] 
True
PASSED
7 passed

• All mock tests pass (5/5)
• All hardware tests pass (7/7)
• ruff check passes

[Copilot]

Pull request overview

Updates the HTS221 driver to automatically trigger a fresh one-shot measurement when reading temperature/humidity while the sensor is in power-down (or configured for one-shot), and adds a combined read() API to avoid double conversions.

Changes:

• Add _is_power_down(), _is_one_shot_mode(), trigger_one_shot(), and _ensure_data() helpers and call _ensure_data() from temperature() / humidity().
• Add read() that returns (humidity, temperature) after a single trigger; make get() delegate to read().
• Add CTRL_REG1/CTRL_REG2/STATUS_REG bit constants in const.py.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
lib/hts221/hts221/device.py	Adds one-shot auto-trigger logic, ensures fresh data in power-down/one-shot, and introduces a single-trigger read() API.
lib/hts221/hts221/const.py	Introduces bitmask constants used for mode/status handling in the driver.

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