🛡️ Sentinel: [security improvement] Replace insecure os.system for Windows ANSI colors

[Jandir]

🚨 Severity: LOW / SECURITY ENHANCEMENT
💡 Vulnerability: The application used os.system("") on Windows to enable ANSI color support via Virtual Terminal Processing. Calling os.system with an empty string spawns an unnecessary subshell (cmd.exe), which creates processing overhead and, in compromised environments, could interact with manipulated environment paths or shell vulnerabilities.
🎯 Impact: Using os.system just to manipulate the console environment is a security anti-pattern. While the direct risk here is low, adopting programmatic API interaction strengthens defense-in-depth and reduces unnecessary process execution footprints.
🔧 Fix: Replaced os.system("") with a direct call to the Windows API via ctypes.windll.kernel32.SetConsoleMode(handle, mode | 0x0004), providing a secure, shell-less way to toggle Virtual Terminal Processing.
✅ Verification: Ran pytest tests successfully and verified logic applies cleanly on Windows platforms via existing sys.platform == "win32" guard.

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PR created automatically by Jules for task 9101929061666760844 started by @Jandir

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