Task 610: Add Callisto to Jupiter Capture 3D Scene

Status: DONE

Summary

Task 609 spec required all 4 Galilean moons (Io, Europa, Ganymede, Callisto) but the implementation only included 3. Add Callisto to complete the Jupiter system visualization.

Acceptance Criteria

• Callisto added to PLANET_COLORS, PLANET_RADII, MOON_PERIODS_DAYS constants
• Callisto appears in prepareJupiterCaptureScene() planets, orbit circles, and timeline
• Callisto added to standalone viewer (orbital-3d.html) and inline viewer (templates.ts)
• Unit tests updated to verify 4 Galilean moons
• All existing tests continue to pass

Dependencies

• Task 609 (DONE) — Jupiter capture scene

Key Files

• ts/src/orbital-3d-viewer-data.ts — scene function + constants
• ts/src/orbital-3d-viewer-data.test.ts — unit tests
• ts/examples/orbital-3d.html — standalone viewer
• ts/src/templates.ts — inline viewer