🛡️ Sentinel: [CRITICAL] Fix command injection in unix id-lookups

[Donach]

🚨 Severity: CRITICAL
💡 Vulnerability: Unsanitized parameters (username and groupName) were passed to execSync inside interpolated strings, allowing malicious inputs to execute arbitrary shell commands.
🎯 Impact: Potential RCE (Remote Code Execution) or unauthorized access if a crafted username/group name is passed to getUidFromUsername, getGidFromGroupName, or getHomedirFromUsername.
🔧 Fix: Replaced execSync with execFileSync and split arguments into an array, bypassing the shell evaluator completely. Added -- prefix before dynamic inputs to additionally prevent argument injection.
✅ Verification: Ran workspace tests in packages/core ensuring no regressions.

Note: Addressed in packages/core/src/unix/id-lookups.ts

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PR created automatically by Jules for task 11013052689945252727 started by @Donach

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