I built a security layer for AI systems in pure C after realizing most AI security tools (Python-based, 50-200ms latency, dozens of dependencies) were adding attack surface rather than reducing it. Shield: 23K LOC, 0 dependencies, sub-millisecond latency, 194 Cisco-style CLI commands, 20 enterprise protocols, 6 specialized guards. Part of SENTINEL (80K LOC AI Security Platform). GitHub: https://github.com/DmitrL-dev/AISecurity