Michael Mainguy a9054c2389 Add procedural lightmap system for planets and asteroids ...

- Create sphereLightmap.ts for procedural lighting generation
- Update planets to use lightmaps oriented toward sun
- Switch asteroids to PBR material with noise texture
- Use sphere physics shape for asteroids

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-10-29 17:30:02 -05:00

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