🛡️ Sentinel: [MEDIUM] Fix information leakage in JSON-RPC handlers

[davidruzicka]

🛡️ Sentinel: [MEDIUM] Fix information leakage in JSON-RPC handlers

🚨 Severity: MEDIUM
💡 Vulnerability: Information Leakage. The prompts/get, resources/read, and completion/complete JSON-RPC handlers directly returned (error as Error).message to clients, potentially leaking internal stack traces or sensitive error details.
🎯 Impact: Attackers could gain insights into the server's internal state, filesystem structure, or backend technologies via verbose error messages.
🔧 Fix: Wrapped the error handling logic to generate a secure correlationId, log the raw error internally using this.logger.error, and format the client response using this.formatErrorForClient(error, correlationId). Updated related string tests to match the new format.
✅ Verification: Ran npm run test, and 3190 tests passed, validating both the functionality and the updated test assertions.

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PR created automatically by Jules for task 15313534493480958067 started by @davidruzicka

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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