KernelBench Hard lives in a monorepo

KernelBench Hard is no longer the standalone repo — the canonical home is a monorepo (kernelbench.com) where the Next.js site lives at the root and the benchmark suite is a git-subtree under benchmarks/hard/. The standalone KernelBench-Hard repo still exists but is just a mirror; the website reads benchmark JSON from benchmarks/hard/results/ at build time via lib/data.ts, so commits to the standalone do not flow back. Setup is uv sync inside benchmarks/hard/ plus npm install at the repo root.