🛡️ Sentinel: [CRITICAL] Fix command injection in system-handlers.ts

[google-labs-jules]

• 🚨 Severity: CRITICAL
• 💡 Issue: The set_cvar handler in system-handlers.ts interpolated unsanitized user inputs (rawName and value) directly into console command strings. This allowed attackers to inject arbitrary console commands (e.g., value; Quit;).
• 🎯 Impact: Remote code execution / arbitrary console command execution within the Unreal Engine editor via the automation bridge.
• 🔧 Fix: Sanitized rawName and value using sanitizeCommandArgument before interpolating them into the console command string, and updated the response payload to return the sanitized values for consistency.
• ✅ Verification: Ran npm run lint, npm run type-check, npm run test:unit, and npm run build to verify standard functionality and ensuring no regressions occurred.
• 📝 Pattern Used: Used sanitizeCommandArgument from src/utils/validation.ts applied to all dynamically inserted parts of the console command string as well as validating for empty inputs.

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PR created automatically by Jules for task 3390057170719728878 started by @ChiR24

[google-labs-jules]

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