- Update benchmarks/v0.4.0/REPORT.md with optimization results: Task A access-log sampling (-29% latency, -65% allocs), Task B file-cache fix (-99.8% allocs, +73% throughput), Task C RemoteAddr string caching. - Add scripts/bench-compare.sh to compare two benchmark summaries and flag regressions beyond configurable thresholds. - Add benchmark-pprof.yaml for reproducible pprof collection.