State the no-duplication contract up front with a leading word: the map
indexes decisions and points at the tickets that hold them; a decision
lives in exactly one place — its ticket — so the map only gists and links.
Also close a fog-vs-ticket duplication: graduating fog into a ticket now
clears the graduated patch from the Fog.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
