Two copies, one stale

The failure

A fact gets written into more than one place instead of referenced once. Nothing ties the copies together, so when the fact changes one copy is updated and the others are not. Over time they drift out of sync, and there is no way to tell which one is right — they all look equally authoritative. The duplication that felt harmless when written is what makes the knowledge base untrustworthy later.

Watch it happen — then get refused

TODO: map to a shipped example.