summary adds knowledge graph negative evidence guard for scibase issue #17. holds public graph recommendations that depend on retractions unresolved contradictions failed replications stale negative evidence reviews or private evidence. adds reviewer reports and demo transcript evidence under knowledge graph negative evidence guard reports.

verification npm run check passed. npm test passed 6 tests. npm run demo produced status block publication and digest b245bc907bb0911addeb552f2bd24ed4c51e6f895cceca6840a3985df1af39ac.

safety synthetic graph packets only. no credentials private research data external apis ontology calls storage writes or live project mutations.

/claim #17