KOKU/KDT-1 Anomalous-Force Hypothesis: Closed-System Digital Momentum Audit

This technical note examines whether KDT-1 entails non-reaction propulsion. It does not. A synthetic momentum audit compares KDT-1 alone, a reaction-omitted force model, a closed device-plus-field model, and an external-gradient model. Only the reaction-omitted model creates nonzero total momentum; closed and externally coupled systems conserve total momentum. The illustrative 1.0e-7 N input is a simulation parameter, not a measured force. This is an unvalidated anomalous-force hypothesis, and no physical force or thrust is claimed. The deposit includes the report, deterministic Python code, time-series CSV, machine-readable JSON, and figure.