A fact fetched twenty minutes ago and stated now is a guess with a citation. Pull requests merge, branches move, jobs finish. The interval between reading and reporting is the window in which a confident sentence becomes false, and the cheapest fix is to make that window small: the fetch is the last step before the sentence that uses it.
Durations are the case most often got wrong, because they feel like narration rather than data. “Shortly after”, “a month later”, “within hours” are measurements. Written from a felt sense of how long something took, they are invented — and they age into a permanent record where nobody can tell they were guessed.
Behaviour claims have the same shape. How something renders, whether an interaction works, what a user sees: those come from running it, not from reading the code that ought to produce it.