🛡️ Sentinel: [CRITICAL] Fix command injection in ID lookups

[Donach]

🚨 Severity: CRITICAL
💡 Vulnerability: Command injection vulnerability in packages/core/src/unix/id-lookups.ts. The code used execSync with string interpolation (e.g., execSync(\getent group "${groupName}"`)), allowing malicious input in usernames or group names to execute arbitrary shell commands. 🎯 **Impact:** If an attacker can control the username or group name input, they could execute arbitrary shell commands on the host system. 🔧 **Fix:** Replaced execSyncwithexecFileSyncand parameterized arguments (e.g.,execFileSync('getent', ['group', '--', String(groupName)])). Using --prevents argument injection. This prevents the shell from parsing user inputs as commands. ✅ **Verification:** Verified by runningpnpm -w run lint:fixandpnpm --filter @agor/core test -- src/unix/user-manager.test.ts. Added a journal entry to .jules/sentinel.md`.

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PR created automatically by Jules for task 4600681115705557771 started by @Donach

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