🧪 [testing improvement description] Add test suite for python fibonacci function

[tsainez]

🎯 What: Added a testing gap coverage by creating test_recursion.py using Python's unittest framework to validate the fib function in python/recursion.py. It correctly ignores Python binary cache.

📊 Coverage: Covered edge case behavior (missing bounds for 0 -> throws TypeError), negative input handling, base cases (fib(1), fib(2)), and general positive sequences (fib(8)).
✨ Result: Improved test coverage and reliability for the recursive functions in the codebase.

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PR created automatically by Jules for task 16389592376122752941 started by @tsainez

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