🛡️ Sentinel: [CRITICAL] Fix Command injection vulnerabilities by migrating execSync to execFileSync

[raccioly]

🚨 Severity: CRITICAL
💡 Vulnerability: Command injection via execSync. Multiple instances interpolated user-controlled input (like projectDir or arguments) or executed shell pipelines directly via execSync().
🎯 Impact: Attackers or compromised dependencies could execute arbitrary system commands by exploiting un-sanitized shell metacharacters (e.g. &&, |, ;).
🔧 Fix: Replaced all vulnerable execSync calls with execFileSync(), executing binaries directly with arguments passed as an array, bypassing the shell. Emulated shell pipelines (like | wc -l) directly in JavaScript to ensure equivalent behavior.
✅ Verification: Ran node --test tests/*.test.mjs and passed code review.

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PR created automatically by Jules for task 13610778824970286427 started by @raccioly

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