⚡ Bolt: Optimize string prefix checking in job_parser.py

[anchapin]

💡 What: Change section_header_starts to a tuple and pass directly to line_lower.startswith().
🎯 Why: Avoids O(N) Python-level iteration by pushing prefix matching to optimized C code and removes redundant derivative string checks.
📊 Impact: Microscopic performance improvement in parsing logic, reducing memory allocations in comprehensions.
🔬 Measurement: Run pytest to ensure job parsing behavior remains accurate.

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PR created automatically by Jules for task 15439536561288732242 started by @anchapin

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