🛡️ Sentinel: [MEDIUM] Fix exception details leakage in Mistral Agent API

[AGI-Corporation]

• Severity: MEDIUM
• Vulnerability: Uncaught backend exceptions or specific errors without user-friendly messages would leak exception class, stack, or inner variables as part of the str(e) output in error response messages on the agents/mistral_agent/agent.py endpoints.
• Impact: External API users or malicious actors could analyze standard error reporting responses (500) to find internal system states, file paths, or other non-intended infrastructure traces.
• Fix: Switched to log explicitly locally, using standard error outputs, then respond with generic messages.
• Verification: Start fastAPI standard instance and attempt a misconfiguration that will throw exceptions inside those 3 affected routes and verify their responses. Run test suites.

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PR created automatically by Jules for task 18041234957298008766 started by @AGI-Corporation

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