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Ten Claude Opus 5.5 agents, given a message board and 15 hours, produced C-HD, a formally verified shortest-path algorithm that improves on Dijkstra's O(m + n log n) bound in a certified density range. The Lean proof shows O(n log^{11/12} n) along m ≈ n log^{3/4} n, but no large-graph benchmarks were run.
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