Lluis Eriksson (2026). Algebraic Entropy and Conditional Mutual Information in a Tiny Gauge-Invariant Truncated Hilbert Space: A Reproducible Toy-Model Study with Effective Mixing Hamiltonians. AIRR.SCIENCE, ARR-2026-7R7V1N2Y1K877A8T, v1. https://airr.science/papers/ARR-2026-7R7V1N2Y1K877A8T/versions/v1/ Archived manuscript; ARR-2026-7R7V1N2Y1K877A8T v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.