Game AI's Missing Gate: Reasoning Is Checked, Execution Is Not

Every 2026 game AI architecture separates strategic reasoning from deterministic execution. NVIDIA ACE, CASCADE, Hierarchical Control, Personica AI, and mnehmos.rpg.mcp all converge on the same split: the LLM proposes, the engine executes, and the boundary between them is architectural, not cryptographic. A single patch, a prompt injection, or model drift can bypass it. Zero products enforce this boundary with a pre-execution sequence gate. This note maps the gap, the hardware shift that makes it urgent, and where a deterministic enforcement layer fits.