Running pruefe_prosa with a complete clone set resolved every SHA citation in the
repo except one, and that one is an Alertmanager silence id from 2026-08-15, sitting
in #0002 next to two siblings that were already listed as exceptions.
With it entered the repo reaches 0 errors and 0 unverified citations - every commit
named in documentation demonstrably exists in the repository it claims to be in.