summary.json: position transitions, shared-Storage invariants and explicit serial boundary.gates.json: complete CPU/HIP/sanitizer counts and focused test dimensions.environment.txt: device/runtime and test commands.
This node is a correctness reference, not a performance result. forward_cached_rows() serializes
one B1 view per divergent row, so a future positions-aware HIP implementation can be accepted only
by matching these row logits, positions, Storage contents and error contracts.