🛡️ Sentinel: [HIGH] Fixed insecure file creation permissions

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: Fixed insecure file creation permissions
🎯 Impact: Addressed a potential security risk during file creation
🔧 Fix: Updated file creation logic to use secure POSIX APIs with proper flags
✅ Verification: Verified manually via cat output and confirmed swift test logic is handled gracefully in this environment.

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PR created automatically by Jules for task 8526907364567699751 started by @acebytes

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