Task 603: 3D Counterfactual Routes — E2E Tests + Full Route + EP01/EP05

Status: DONE

Summary

Task 602 added IF counterfactual routes to Saturn and Uranus local scenes. This task completes coverage:

1. E2E tests for the 3D scenario toggle UI (no Playwright coverage yet)
2. Full-route scene IF routes (cross-episode summary 3D viewer has no counterfactuals)
3. EP01 direct-route IF scenario in episode-1 3D scene
4. EP05 Jupiter flyby necessity IF in uranus-approach or episode-5 scene

Key Files

• ts/e2e/examples.spec.ts — 3D viewer E2E tests
• ts/src/orbital-3d-viewer-data.ts — scene data
• ts/src/orbital-3d-viewer-data.test.ts — data unit tests
• ts/src/orbital-3d-viewer.js — renderer
• ts/src/templates.ts — inline scene prep

Dependencies

• Task 602 (3D IF counterfactual routes) — DONE