Refactor: Move inline imports to top of file (AGENTS.md)

[Copilot]

Addresses code review feedback about inline imports in test_controller.py violating AGENTS.md guidelines.

Changes

• Moved subprocess and os imports from inline within test functions to the top of the file

Before:

import sys
import pytest
from python.christmas_lights_kata.src import controller

def test_main_with_invalid_instruction(tmp_path):
    import subprocess
    import os
    # ...

After:

import os
import subprocess
import sys

import pytest

from python.christmas_lights_kata.src import controller

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