🛡️ Sentinel: [CRITICAL] Fix command injection vulnerability

[raccioly]

🚨 Severity: CRITICAL
💡 Vulnerability: Unsafe shell commands via execSync leading to potential command injection. For example, dynamically passing variables like a user-supplied CLI name or projectDir to a shell can result in arbitrary command execution if the input is malicious.
🎯 Impact: Prevents malicious attackers from injecting and running unauthorized arbitrary system commands (e.g., executing ; rm -rf /).
🔧 Fix: Replaced vulnerable execSync calls with execFileSync across multiple files, effectively bypassing shell interpolation. Cleaned up unused execSync imports to prevent future developers from introducing this vulnerability again. Emulated shell logic natively using Node.js logic and API.
✅ Verification: Ran node --test tests/*.test.mjs to ensure the project works normally without regressions.

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PR created automatically by Jules for task 18269154196101963359 started by @raccioly

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