🛡️ Sentinel: [security improvement] Prevent Terminal Injection and DoS

[google-labs-jules]

🚨 Severity: MEDIUM
💡 Vulnerability: CLI input (--name) was echoed back to the terminal without validation.
🎯 Impact: Attackers could provide ANSI escape sequences to manipulate the terminal or very long strings to cause resource exhaustion in logs/terminals.
🔧 Fix: Added validation to project/app.py to limit name length to 100 characters and block control characters (ASCII < 32).
✅ Verification: Added unit tests in tests/test_app.py covering both length and control character constraints. Verified with pytest.

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PR created automatically by Jules for task 11232632176669271376 started by @amrabed

[google-labs-jules]

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