The residual paragraph called it "a stronger mutation", which is a judgement
about size; what the mechanism requires is a second mutation of the same clause,
declared and required to redden the proof. One vocabulary across the rule field,
the manifest and the body, so a reader does not have to decide whether two
descriptions are the same thing.
Refs #881
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015QqCpYFsKgnAnx6jVwrKiV