TRUE 13.1 — Official Methodological Addendum Formal Clarifications, Invariants, and Reproducibility Conditions

This addendum accompanies the publication TRUE 13.1 — Absolute Minimal Test without altering its experimental protocol or its fundamental hypotheses.Its sole purpose is to correct and stabilize certain invariant notations, to make explicit the conceptual derivation of the operational frequency mentioned, and to strengthen reproducibility criteria in accordance with the TRUE ≥ v6.0 framework.No new experimental results are presented.No external data are introduced.No additional hypotheses are added.The integrity of the TRUE 13.1 protocol remains absolute.