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mf² uses Ultracite for linting and formatting. Ultracite is a zero-config preset built on Biome, a Rust-based toolchain that replaces ESLint and Prettier. 
bun run check    # lint and format check
bun run fix      # auto-fix issues
A Lefthook pre-commit hook runs ultracite check before every commit. Configuration lives in biome.jsonc at the project root. Ultracite provides the defaults; override individual rules as needed. See Ultracite docs.