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The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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2L Qwen3, d=5, 2h/1kv, hd=2
// strict: Catches fire-and-forget writes that ignore backpressure