feat: add workflow node registry phase 2

docs/workflows/WORKFLOW_DELIVERY_CHECKLIST.md

@@ -4,18 +4,18 @@
 
 ### Phase 1
 
-- [ ] Canonical workflow schema finalized
-- [ ] Frontend and backend workflow types aligned
-- [ ] Preset workflow migration helpers added
-- [ ] Tests added for legacy preset conversion
-- [ ] Legacy dispatch remains default
+- [x] Canonical workflow schema finalized
+- [x] Frontend and backend workflow types aligned
+- [x] Preset workflow migration helpers added
+- [x] Tests added for legacy preset conversion
+- [x] Legacy dispatch remains default
 
 ### Phase 2
 
-- [ ] Node registry implemented
-- [ ] Node definitions API available
-- [ ] All required nodes have settings schemas
-- [ ] Editor consumes node definitions from backend
+- [x] Node registry implemented
+- [x] Node definitions API available
+- [x] All required nodes have settings schemas
+- [x] Editor consumes node definitions from backend
 
 ### Phase 3