Description:
Create an Arduino sample replicating the MicroPython behavior.

What needs to be done:

• Setup 3 LEDs (output) and 3 buttons (INPUT_PULLUP).
• Toggle each LED on button press.
• Add basic debounce (~200 ms).
• Log actions to Serial.

Acceptance criteria:

• One press = one toggle.
• Works on a standard Arduino board.
• Behavior matches the MicroPython example.