⚡ Bolt: Replace regex split with native string split

[thirdeyenation]

💡 What: Replaced re.split(r'\s+', value) with native str.split() and utilized the walrus operator (:=) for list comprehensions in helpers/skills.py.
🎯 Why: str.split() is heavily optimized in C and avoids the overhead of compiling and executing a regular expression for basic whitespace tokenization. The walrus operator prevents redundant function calls in list comprehensions.
📊 Impact: Expected to speed up string splitting and normalization by ~5-6x.
🔬 Measurement: Verified using timeit for performance gains and ran tests (test_skills_runtime.py via mock script) to ensure functional parity.

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PR created automatically by Jules for task 9319227194418728393 started by @thirdeyenation

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