⚡ Bolt: Combine chown and chmod directory traversals

[WHYCRASH]

💡 What:
Replaced an external os.system("chown -R ...") call with native Python os.chown integrated into the existing os.walk loop in cidata_ingest.py.

🎯 Why:
Previously, the code performed two full passes over the target directory: one via a spawned subshell running the chown -R binary, and a second via Python's native os.walk to enforce file permissions. Spawning external subshells (os.system) is slow and incurs unnecessary context-switching overhead, and redundantly traversing the file tree doubles the I/O cost.

📊 Impact:

• Eliminates subshell spawn overhead for changing ownership.
• Reduces directory traversals by 50% (combines permission and ownership operations into a single O(N) pass).
• Avoids external dependency calls, providing better cross-platform/sandbox compatibility and standardizes on native Python file manipulation.

🔬 Measurement:
Run python3 -m pytest test_cidata_ingest.py to ensure the logic changes did not break the surrounding operations or error handling paths. Testing passes perfectly and py_compile checks verify the syntax.

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PR created automatically by Jules for task 16444581823109378350 started by @WHYCRASH

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