⚡ Bolt: [performance improvement]

[thirdeyenation]

💡 What: Replaced the list comprehension in DirtyJson.get_start_pos from [input_str.find(char) for char in chars if input_str.find(char) != -1] to [idx for char in chars if (idx := input_str.find(char)) != -1].

🎯 Why: The original comprehension called input_str.find() twice for every character (once for the truthy evaluation and once to store the result). Since find() scans the string, this resulted in executing O(N) operations redundantly.

📊 Impact: Reduces the time complexity of the start position search loop for large JSON strings by a factor of 2, minimizing CPU time spent searching for {, [, or ".

🔬 Measurement: Run PYTHONPATH=. python3 -m pytest tests/test_dirty_json.py to verify the parsed structure behavior functions correctly and there are no logic regressions.

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PR created automatically by Jules for task 13487917437259637952 started by @thirdeyenation

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