tolelom 1b0e12e824 feat(renderer): add CSM, point/spot shadows, and frustum light culling ...

- CascadedShadowMap: 2-cascade directional shadows with frustum-based splits
- PointShadowMap: cube depth texture with 6-face rendering
- SpotShadowMap: perspective shadow map from spot light cone
- Frustum light culling: Gribb-Hartmann plane extraction + sphere tests
- Mat4::inverse() for frustum corner computation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 20:55:43 +09:00

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