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Remove old bench/universal_v2 (renamed to bench/main_benchmark)
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Rename universal_v2 -> main_benchmark (scripts, bench/ dir, env vars SF_MAIN_BENCH_*, README)
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Add universal_v2 benchmark scoring (universal_v2_evaluate + aggregate) + 60-case reference structures/annotations/cases.yaml (paths scrubbed; CPU-only; reproduces hit flags 2594/2594)
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Add benchmark reproduction: CPU scoring/eval (evaluate_prediction+batch_eval), reference structures, region manifests, headline prediction sets, reproduce_benchmark.py (reproduces main minority_hit_rate table; 15/15 cells verified by re-scoring 1440 PDBs)
