⚡ Bolt: Replace os.system with native os.walk in cidata_ingest.py

[WHYCRASH]

💡 What: Replaced three os.system subshell spawns (chown, and two find commands) with a single native Python os.walk loop in cidata_ingest.py.

🎯 Why: To prevent the overhead of spawning three external processes and performing multiple recursive filesystem walks when correcting ownership and permissions for the extracted secrets archive.

📊 Impact: Execution time for directory traversal and permission modifications is significantly reduced (measured reduction from ~0.027s to ~0.007s in a basic test). This makes the startup secrets ingestion phase faster.

🔬 Measurement: A benchmarking test script comparing os.system with find versus native os.walk execution for traversing and setting properties on files. Existing test_cidata_ingest.py tests continue to pass.

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PR created automatically by Jules for task 18061854391052555762 started by @WHYCRASH

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