🛡️ Sentinel: [CRITICAL] Fix command injection in terminal service

[Donach]

🚨 Severity: CRITICAL
💡 Vulnerability: Command injection vulnerability in apps/agor-daemon/src/services/terminals.ts where user-controlled input (chownTo) was interpolated directly into a shell command executed via execSync with sudo.
🎯 Impact: Potential root privilege escalation since the command is executed with sudo.
🔧 Fix: Replaced execSync with execFileSync and parameterized arguments, casting them to String and prepending --.
✅ Verification: Ran pnpm -w run lint:fix and pnpm --filter @agor/daemon test to confirm tests pass and no regression introduced. Updated Sentinel journal with learnings.

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PR created automatically by Jules for task 18401671691682093998 started by @Donach

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