tests: Add board qualification tests for A/B/Menu buttons.

[nedseb]

Summary

Closes #86
Depends on #89 (framework extension)

Adds board qualification tests for the A, B, and Menu buttons (directly connected to STM32WB55 GPIO, not via I/O expander).

Note: D-PAD buttons (UP/DOWN/LEFT/RIGHT) are already tested in mcp23009e.yaml via the MCP23009E I/O expander.

Scenario: tests/scenarios/board_buttons.yaml

Test	Pin	Type
Button A press detection	A_BUTTON (PA7)	hardware_script (interactive)
Button B press detection	B_BUTTON (PA8)	hardware_script (interactive)
Button MENU press detection	MENU_BUTTON (PA0)	hardware_script (interactive)

Each test lights up the green LED and polls the button for 5 seconds. The operator must press the button while the LED is on.

How to test

# Mock tests (no regression)
pytest tests/ -k mock

# Collect button board tests
pytest tests/ -k board_buttons --collect-only

# Run on hardware (requires STeaMi board, interactive)
pytest tests/ --port /dev/ttyACM0 -k board_buttons -s

Test results

$ pytest tests/ -k mock -q
41 passed, 95 deselected

$ pytest tests/ -k board_buttons --collect-only -q
3 tests collected (Button A, Button B, Button MENU)

$ pytest tests/ -k board_buttons -q  # (sans --port)
3 skipped  # correctly skipped without hardware

$ pytest tests/ --port /dev/ttyACM0 -k board_buttons -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 113 items / 103 deselected / 10 selected                                                                                                                                                                                                                          

tests/test_scenarios.py::test_scenario[board_buttons/Button A press (polling)/hardware]   [INTERACTIVE] Test polling boutons : appuyez sur chaque bouton quand la LED verte s'allume (5s). Commençons par A.
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/Button B press (polling)/hardware]   [INTERACTIVE] Bouton B
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/Button MENU press (polling)/hardware]   [INTERACTIVE] Bouton MENU
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/D-PAD UP press (polling)/hardware]   [INTERACTIVE] Test polling D-PAD : appuyez sur chaque bouton quand la LED verte s'allume (5s). Commençons par UP.
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/D-PAD DOWN press (polling)/hardware]   [INTERACTIVE] Bouton DOWN
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/D-PAD LEFT press (polling)/hardware]   [INTERACTIVE] Bouton LEFT
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/D-PAD RIGHT press (polling)/hardware]   [INTERACTIVE] Bouton RIGHT
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/Button A press (interrupt)/hardware]   [INTERACTIVE] Test interrupt boutons : appuyez brièvement sur chaque bouton quand la LED verte s'allume (5s). Commençons par A.
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/Button B press (interrupt)/hardware]   [INTERACTIVE] Bouton B
True
PASSED
tests/test_scenarios.py::test_scenario[board_buttons/Button MENU press (interrupt)/hardware]   [INTERACTIVE] Bouton MENU
True
PASSED

====================== 10 passed, 103 deselected in 14.76s ======================

Hardware test results will be added after board validation.

Test plan

• ruff check tests/ — passed
• pytest tests/ -k mock — 41 passed (no regression)
• 3 button board tests correctly collected and skipped without --port
• Hardware validation on STeaMi board (pending)

[Copilot]

Pull request overview

Adds a new board-level qualification scenario to validate that the STeaMi board’s A, B, and MENU buttons (direct GPIO, active-low w/ pull-up) can be detected during an interactive hardware test run.

Changes:

• Adds tests/scenarios/board_buttons.yaml as a type: board scenario.
• Implements three hardware_script tests that light LED_GREEN and poll each button for up to 5 seconds.
• Marks all tests as mode: [hardware] so they are skipped unless run with --port (and interactive -s).

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[nedseb]

Corrections suite à la review Copilot (fd3334d) :

• Vérification de l'état relâché : chaque test attend maintenant que le bouton soit relâché (btn.value() == 1) avant d'allumer la LED et de démarrer la détection. Cela évite les faux positifs si le bouton est stuck-low ou maintenu.
• `wait: false` : le prompt s'affiche sans attendre Entrée, la LED verte sert de signal de démarrage (même pattern que les tests D-PAD dans `mcp23009e.yaml`).

[Copilot]

Pull request overview

Adds a new board qualification scenario to validate STeaMi’s A/B/MENU buttons via interactive MicroPython scripts executed directly on hardware (no driver required), aligning with the recently introduced type: board scenario support.

Changes:

• Add tests/scenarios/board_buttons.yaml with hardware-only button press detection scripts.
• Provide both polling-based and interrupt-based detection variants per button.

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