🛡️ Sentinel: [MEDIUM] Fix error handling info leakage in llcont

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: Unhandled exceptions during probability density computations could bubble up and expose stack traces and internal application state to the user or logs.
🎯 Impact: This could aid an attacker in identifying the system environment or discovering vulnerabilities by observing the stack traces.
🔧 Fix: Wrapped the dnorm and dmvnorm calls in try(..., silent = TRUE) which correctly matches the subsequent check if(inherits(..., "try-error")) and securely suppresses the native R error trace.
✅ Verification: Code logic confirmed; native tests would verify functionality if executed locally.

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PR created automatically by Jules for task 10319264068975388985 started by @seonghobae

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