Presence Engine: Deterministic Identity at 0.007ms Latency (0.0006% Overhead)

Presence Engine, a Logic-over-Model (LOM) substrate decoupling identity governance from probabilistic inference. Benchmark results show 0.007ms warm-path mean latency (p99: 0.016ms) across 50 runs, representing 0.0006% of full-turn cost (844.5ms inference). Deterministic vetoes achieve 100% integrity (6/6) with randomized corrections, proving dynamic regrounding. Cross-run CV of 7.96% confirms stability. This demonstrates structured governance can be mathematically free, enabling persistent cognitive partnership without alignment tax.Keywords: LOM, Presence Engine, deterministic AI, identity persistence, low-latency substrate, neuro-symbolic, stateful LLM, sovereignty veto, cognitive partnership, structural governance Research Context: This work is a core component of the Presence Engine™ Living Thesis (DOI: 10.5281/zenodo.17280692).