{ "runtime": "native Linux g++ with __EMSCRIPTEN_PTHREADS__ adapter and -pthread -O3 -std=c++17", "availableLogicalCpus": 4, "recordedAt": "2026-10-05", "sourceRevision": "5335a35", "scope": "Temporary alpha-cache experiment; build each topology once, alternate original/cached extraction3times and require exact complete JSON and every tetrahedron region against same-topology original CPU regions. Native timings are not Wasm timings. 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