riotpiao.com/tasks/3.6-frontend-wave-columns.md

3.6 — Frontend: wave columns + resource tree (GREEN)

Phase: 3 — Delivery Tree (Surface E) Stage: GREEN

Depends on: 3.2, 3.4, 3.5

• Frontend: React Flow, wave columns left->right from sync-wave annotations. Click app -> side panel with react-arborist virtualized resource tree, lazy-loaded children