Lights — user documentation

The lighting side of the scene: the light model, shadows, and emissive materials.

Page	Topic
Lights	Scene-global lights (directional/point/spot/ambient), `MAX_LIGHTS`, packed indices
Shadows	Shadow mapping: picking the casting light, the packed-index pitfall, tuning
Emissive + Exposure	Emissive materials (HDR glow) and runtime exposure

Example folder: lib/examples/lights/ (shadow, shadow_test, spot_test, emissive).

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