🛡️ Sentinel: [security improvement]

[ightevenmckane187]

🛡️ Sentinel: Secure Error Logging

• 🚨 Severity: MEDIUM / SECURITY ENHANCEMENT
• 💡 Vulnerability: Potential stack trace and sensitive information (e.g. database connection strings, passwords) leakage in console error logs.
• 🎯 Impact: Unauthorized exposure of server-side state or credentials in deployment logs if dependencies (like Redis) or cryptographic methods fail.
• 🔧 Fix: Replaced raw error object logging with err?.message || err in redisPool.ts, sessionMiddleware.ts, and verifier.ts.
• ✅ Verification: Added a dedicated Jest verification test suite tests/sentinel_sanitized_logs.test.ts to assert secure logging across all 3 modules. All tests pass successfully.

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PR created automatically by Jules for task 16814182388692712325 started by @ightevenmckane187

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