🛡️ Sentinel: [CRITICAL] Fix LaTeX Injection RCE and DoS

[anchapin]

🚨 Severity: CRITICAL\n\n💡 Vulnerability: PDF compilation commands (pdflatex and pandoc) did not disable shell escape and lacked timeouts.\n\n🎯 Impact: An attacker could inject malicious LaTeX code to execute arbitrary shell commands (RCE) via \write18 or cause a Denial of Service (DoS) via infinite compilation loops.\n\n🔧 Fix: Added -no-shell-escape flag to pdflatex and --pdf-engine-opt=-no-shell-escape to pandoc. Wrapped communicate() in a 30-second timeout block that cleans up the process if it hangs.\n\n✅ Verification: Verified the fixes in cli/pdf/converter.py and cli/generators/cover_letter_generator.py and ran the full test suite to ensure no regressions were introduced.

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PR created automatically by Jules for task 7127278171201720126 started by @anchapin

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