V3 JavaScript/TypeScript web-code quality capability pack. By-value connector composition (service_kind=cli, no separate ingredient): one local biome CLI ingredient exposes bounded project operations for readiness and formatter/linter/import-sorting diagnostics. Quality checks run from an explicit project directory cwd supplied at execution time, accept one trusted file or directory target, return JSON diagnostics, avoid caller-supplied Biome flags, avoid shell wrappers, and never write files. Fixed-function and reproducible: CI check mode only, JSON reporter, colors disabled, diagnostics capped, no write/fix/unsafe mode, no init/migrate/upgrade/search/LSP/daemon command, no stdin, no caller-supplied config path, no reporter file, no staged/changed/VCS selector, no watch mode, no environment override, no arbitrary command execution, and no network egress. Requires biome on PATH. Local and no-egress.