Produces Alon's design-doc system BEFORE code: SOURCE_OF_TRUTH, ARCHITECTURE_ROADMAP, TODO_WORKFLOW, CLAUDE.md (+ modular docs/architecture). Model first: data + invariants → core enforcement → failure paths → API contracts → phased workstream. Use proactively when a new app, feature, or workstream is starting and code hasn't been written, or docs may have drifted (audit). Also on "architect", "design doc", "spec this out", "roadmap". Not for small fixes inside a current design.
