Replace std::vector path tracking with SearchNode shadow tree#12

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borg323 with Copilot wants to merge 4 commits into

copilot/update-backprop-to-search-tree

Commits on May 13, 2026

Replace vector<Node*> path tracking with SearchNode shadow tree

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Commits on May 14, 2026

Move search_root_node_ to Search so shadow tree is shared across all workers

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borg323
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Commits on May 28, 2026

Replace cur_iters Node::Iterator array with SearchNode vector iterators
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Address code review: cache edge_iter for spawning, add null-guard, add comment
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