🛡️ Sentinel: [CRITICAL] Fix Information Leakage via RPC Error Messages

[DerUntote]

🚨 Severity: CRITICAL
💡 Vulnerability: The bot previously passed raw internal RPC error messages back to discord users when commands failed. This could result in information leakage about backend systems, paths, and configurations.
🎯 Impact: Exposing unhandled internal errors exposes internal mechanisms to users, potentially allowing malicious actors to exploit known conditions.
🔧 Fix: Replaced direct err.message calls in message.reply() with generic strings (e.g. An error occurred.), and printed the full error securely to local console via console.error(). Added .catch() block around deletion promises to prevent unhandled rejection crashes.
✅ Verification: Syntax checked all modules using node -c <filepath>, checked with npm run precommit, and successfully received a positive automated code review.

Also added .jules/sentinel.md journal entry as required.

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PR created automatically by Jules for task 15756835032327696875 started by @DerUntote

[google-labs-jules]

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