⚡ Bolt: Optimize whitespace tokenization

[thirdeyenation]

💡 What: Replaced re.split(r"\s+", ...) with native str.split() in helpers/skills.py for whitespace tokenization.
🎯 Why: Native string splitting avoids regular expression compilation and execution overhead, and inherently drops empty strings, providing a much faster fast path for common string processing.
📊 Impact: Speeds up basic whitespace tokenization by ~6x, optimizing hot paths in skill parsing and search.
🔬 Measurement: Verified with Python time.perf_counter benchmarks (0.3060s vs 0.0466s for 100k iterations) and running the test_skills_runtime.py test suite.

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PR created automatically by Jules for task 4460058509538145869 started by @thirdeyenation

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