v4.1.0: substrate -> instance cascade Validated against basef + carmine v4.1.0 MRs (both GREEN). Catalog changes: - base-build-scratch .heavy-job-rules, instance build rules, container-build job_rules: accept ACUTE=true and trigger source Wires the basef -> carmine cascade pattern with cve-watch acute trigger (deterministic pre-screen) and operator acute-rebuild command. AI triage (claude-sonnet) lands in v4.2.0.