backend-authoritative-runtime-refactor

Refactors desktop or web workflow tools so the backend owns workflow truth and the UI becomes a projection plus command surface. Use for split-authority React/Tauri/Electron apps, command/query/event contract design, deleting legacy compatibility seams, normalizing provider tiers, and converging starter/import/export formats. Activate on: "backend-authoritative UI", "separate UI from backend", "remove split authority", "desktop/runtime refactor", "kill legacy compatibility", "single source of truth for execution". NOT for: cosmetic-only UI work, single-component styling fixes, or adding new business features before authority drift is removed.