🛡️ Sentinel: [CRITICAL/HIGH] Fix Unbounded CLI Arguments (DoS)

[EiJackGH]

🚨 Severity: HIGH
💡 Vulnerability: The simulation script accepted unbounded values for 'days', allowing potential Denial of Service (DoS) via resource exhaustion. It also lacked validation for negative inputs (cash, price, volatility).
🎯 Impact: Could cause application crash or incorrect simulation results if exploited.
🔧 Fix: Refactored 'bitcoin_trading_simulation.py' to use a 'main()' function and added strict input validation (days > 0 and <= 36500, non-negative cash/volatility). Also cleaned up duplicate code blocks.
✅ Verification: Added 'test_security.py' to verify invalid inputs are rejected gracefully.

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PR created automatically by Jules for task 11889021400264498482 started by @EiJackGH

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