Function groupSpritesByTexture

Groups consecutive items that share a texture into runs (§55 atlas grouping; §65's "texture atlas grouping" remainder).

Does not reorder. Two sprites that share a texture but are separated by a third stay in two runs — merging them would change draw order. A packer that wants one run per texture sorts first; this helper only reports the runs the current order already has.

const runs = groupSpritesByTexture(sprites);
// [{ texture: atlas, start: 0, count: 3 }, { texture: other, start: 3, count: 1 }]
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