bidirect_index.py:18-25: Implement bidirect index pattern...

[0pdd]

The puzzle 139-658fe398 from #139 has to be resolved:

aibolit/aibolit/patterns/bidirect_index/bidirect_index.py

Lines 18 to 25 in cc472ae

	@todo #139:30min Implement bidirect index pattern
	If the same numeric variable is incremented and decremented within the same method,
	it's a pattern. A numeric variable should either be always growing or decreasing.
	Bi-directional index is confusing. The method must return a list with the line numbers
	of the variables that match this pattern. After implementation, activate tests in
	test_bidirect_index.py
	"""
	return []

The puzzle was created by @yegor256 on 27-May-25.

Estimate: 30 minutes, role: DEV.

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