# 3.9 — simplify skill pass (REFACTOR)

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

Depends on: [3.6](3.6-frontend-wave-columns.md), [3.7](3.7-live-sync-animation.md)

- [ ] `simplify` pass on wave-grouping + virtualized tree code

## Verify

```bash
pnpm test:e2e delivery.e2e.ts      # required, must pass before merge
```