Task 462: Embed Saturn Ring and Uranus Approach 3D Viewers in Cross-Episode Report

Status: DONE

Summary

Task 461 added the full-route 3D viewer embed to the cross-episode report's "3次元軌道解析" section. The Saturn ring crossing and Uranus approach sub-sections still only have 2D sideview diagrams. Per the Phase 27 directive (3D data should use interactive Three.js viewers), these sections should also embed their respective 3D scenes inline.

Plan

1. Add 3d-viewer: directive for saturn-ring scene after the Saturn ring crossing sideview diagram
2. Add 3d-viewer: directive for uranus-approach scene after the Uranus approach sideview diagram
3. Add content validation tests for both new embeds
4. TDD: tests first, then implementation

Impact

• Completes the 3D visualization coverage for all three scenes in the cross-episode report
• Saturn ring plane geometry and Uranus axial tilt are inherently 3D — 2D diagrams miss the full picture