Add knip and a `knip` npm script. knip auto-discovers the entry points (index.ts and cli/cli.ts) from the package's `exports`, so knip.json only needs the project glob. No unused dependencies were found, so none are removed. (knip does flag a dead exported `Bind1` type; left as-is to keep this change scoped to tooling setup.) Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>