🔒 [security fix] Handle initialization errors in McpServer to prevent unhandled panics

[LeandroPG19]

🎯 What: This PR fixes a potential server crash (panic) during initialization by replacing a direct unwrap() with error propagation using the ? operator in McpServer::new.

⚠️ Risk: The previous implementation used .unwrap() when initializing the LocalReasoningEngine. If this initialization failed (e.g., due to PyO3 or environment issues), the entire process would panic and crash. This could be exploited or lead to unplanned downtime (Denial of Service) if the environment becomes unstable.

🛡️ Solution:

1. Modified McpServer::new in cuba_cognitive_engine/src/server/mcp_protocol.rs to return anyhow::Result<Self>.
2. Used the ? operator to propagate errors from LocalReasoningEngine::new.
3. Updated cuba_cognitive_engine/src/main.rs to handle the Result from McpServer::new() using the ? operator.

These changes ensure the application exits gracefully with a structured error message instead of crashing with a panic stack trace.

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PR created automatically by Jules for task 6002136955462202745 started by @LeandroPG19

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