ast-grep-driven detection + ranking into a JSON ledger, two-track apply (deterministic autofix + model span-edits), configurable report/apply modes. Rule packs for JS/TS, Python, Go, Rust, Java; Svelte/SvelteKit support via project tooling + opt-in grammar. Runtime-neutral SKILL.md (Agent Skills spec). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>