Candidate Universal Shell Amendment #8 — Cross-Project Provenance Rule. Work whose technical home is project A but whose discovery happened during project B records both. The change row + change_published event attribute to project A; a cross_project_discovery event in project B's cycle references it via related_event_id + metadata discovered_during=<project_B_cycle>. Bidirectional linkage so reviewing either project shows the full evolution. Fires only when discovery has material impact (new cycle / amendment / schema / infra primitive / architectural reframe / backlog reprior). Queued for next meta-cycle.