[fix·tests] Tests for EPA consistency (#1) - #4
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Dependency-light tests for the full-field write-gate equality and the score-before-breakdown deferral policy. pytest is added to the dev group only; production dependencies are unchanged.
F6: covers nan_safe_eq and the changed()/storage list-comparison call sites, asserting a NaN-bearing row is not counted changed while real drift still is.
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Companion to #1. pytest coverage for the full-field write-gate equality and the score-before-breakdown deferral policy. pytest is added to the dev dependency group only; production dependencies unchanged. Kept separate so the main PR stays minimal — the repository currently has no test infrastructure.
Adds NaN-stability coverage (
test_nan_stability.py): the write/publish gate treats NaN==NaN, so a NaN-bearing row is not counted as changed, while real rank/norm/component drift still is. Exercises both call sites — thechanged()DB gate and the storage-gate ordered-list comparison.